José Figueiredo
                            (short bio) 
                   Departamento de Física & CEOT-UALG
                   E-mail: jlongras@ualg.pt
                   URL: http://w3.ualg.pt/~jlongras/

 

 

             

 

R & D Activities in Optoelectronics and Nanoelectronics


The R & D activities in the areas of Electronics and Optoelectronics, Communications and Signal Processing, comprise the design, fabrication and characterization of devices and circuits: electro-optical and opto-electric converters and optoelectronic oscillators for microwave photonic systems, wireless-to-optical and opticalto-wireless for radio-over-fiber systems, the production and control of chaotic signals. Other  interests: remote sensing, renewable energies and terahertz technologies.  

 

The work is focused on the development of new optoelectronic circuit functionalities based on negative differential conductance devices. It includes hybrid and monolithic integration of Resonant Tunnelling Diodes (RTDs) with laser diodes and with photo-detectors aiming novel non-linear optoelectronic integrated circuits for future chaos based communication systems and novel RF-optical-RF interfaces for cellular networks. For more information on RTD based optoelectronic devices see book chapter Resonant Tunnelling Optoelectronic Circuits.

 

Previous activities dealt with integrated optic WDM devices and optoelectronic applications of resonant tunnelling diodes (RTDs). Two devices that came-out from the RTD investigation, the Resonant Tunnelling Diode Electro-Absorption Modulator (RTD-EAM) and the Resonant Tunnelling Diode Electro-Optic Modulator (RTD-EOM) were patented and an attempt to commercialize optoelectronic solutions based on this RTD technology led to the formation of Essient Photonics, a spun-out of the University of Glasgow in 2002. 

 


The main topics are: 


Outcomes


Coordination of projects:

  • WOWi - Wireless-optical-wireless interfaces for picocellular access networks, Refª PTDC/EEA-TEL/100755/2008 (2010-2012) - Project proponent and coordinator. (Engenharia Electrotécnica - Telecomunicações) 
  • OEO - Physics of Optoelectronic Oscillator Circuits for Communication Systems Applications, Programa de Estímulo à Investigação da Fundação Calouste Gulbenkian (2010-2011) - Project coordinator (investigador responsável por garantir o apoio científico e instuticional ao investigador distinguido).  
  • RTD-EAM - Optical Modulators Based on the Resonant Tunnelling Effect, Refª POSI/CPS/41760/2001 (2002-2005) - Project proponent and coordinator. (Engª Electrotécnica e Informática - Redes e sistemas de comunicação, processamento de sinal) 

Participation in projects:  



Partners:  



Scientific collaborations: 
  • Co-funder of the Centro de Electrónica, Optoelectrónica e Telecomunicações (CEOT), 2001, classificado em Muito Bom pela FCT desde a fundação.
  • Co-author da proposta de nanciamento do CEOT ao Programa Nacional de Re-equipamento Cientíco (CONC-REEQ/601/2001), financiada em 400 000 euros. 
  • Vice-coordenador do CEOT, 2002-2007. 
  • Colaborador do Instituto de Plasmas e Fusão Nuclear, desde 2008.
  • Colaborador do Optoelectronics Research Group, Department of Electronics and Electrical Engineering at The University of Glasgow, desde 1995.
  • Consultor cientíco da spin-o Essient Photonics, Reino Unido 2002-2003.
  • Colaborador do Centro de Ciências e Tecnologias Ópticas, FCUP, 2000-2003.
  • Investigador do Centro de Física do Porto, 1995-2000.
  • Investigador do Centro de Optoelectrónica do Instituto de Engenharia de Sistemas e Computadores
    (INESC), 1992-1995.  


Sponsors:  

 


Postdocs, PhDs, master and undergraduate students supervision:

 

Postdoc

Dr. Horacio Cantu, started March 2011.

 

 

      PhD 

 Bruno Romeira (started Out. 2008)

 In co-tutela with the Department of Electronics and Electrical Engineering - University of Glasgow and the Instituto de Microelectrónica de Sevilla (IMS-CNM). 
 Fundação para a Ciência e Tecnologia PhD grant SFRH/BD/43433/2008.

 

 Title of the working programme

 Optoelectronic integrated circuits incorporating resonant tunnelling devices for communication systems.


 BR fellowships and awards associated with the working programme:

    - Fundação Calouste Gulbenkian Travel Grant, 2008.

    - Luso-American Development Foundation (FLAD) Travel Grant, 2008.

    - IEEE LEOS Student Travel Grant, 2008.

    - Prémio Fundação Calouste Gulbenkian Programa de Estímulo à Investigação, 2009.

    - European Physical Society Conference Grants for Young Scientists, 2011.

    - IEEE Photonics Society Graduate Student Fellowship (GSF), 2011.



Raul Baltazar, 2005/2006 (Co-orientação do primeiro ano de doutoramento).

Aluno de doutoramento da Faculdade de Engenharia de Recursos Naturais da Universidade do Algarve.

Title of the working programme
Application of semi-conductor nanocrystals in the development of biosensors.


Master

Ricardo Luz  (MIEET, started Out. 2011)
Title of the working programme
Circuitos optoelectrónicos baseados em díodos de efeito de túnel ressonante para redes pico-celulares.

 

 

 

Lígia Luís (MIEET, started Out. 2011)

Title of the working programme
Interfaces electro-ópticas e opto-eléctricas para redes de acesso picocelulares baseadas em díodos de efeito de túnel ressonante.

    

  Raquel Silva, 2001/02 (não concluído)
  Mestrado em Física - Ensino

  Title of the working programme:
  Holografia.


Undergraduate students

António Brázio, Eng. Física, 2007/2008 (não concluído)

Joaquim Calado, Lic. Eng. Sistemas e Infromática, 2002/2003. 

 

Participation in examining committees:
- 5 PhDs.
- 11 Masters.

For more details see http://w3.ualg.pt/~jlongras/Ensino.html#juris. 


Outcomes 
 
One national and four international patent applications, 3 book chapters, 19 articles in journals referenced in the ISI Web of Knowledge (3 with IF>3; 5 with IF>2; 8 with IF>1; 3 with IF>0.3), and more than 50 conference papers at major international conferences.  

 

So far the major achievements are: 
  • Demonstration of optoelectronic voltage controlled oscillators based on hybrid integration of a RTD with a laser diode (LD).
  • Description of the RTD-LD optoelectronic voltage controlled oscillator (OVCO) as a Liénard oscillator.
  • Synchronization of RTD-LD optoelectronic voltage controlled oscillators (OVCO) to wireless signals.
  • Novel Wireless-Photonics-Wireless Interfaces based on RTD-LD and RTD-photodiode (RTD-PD) optoelectronic voltage/optical controlled oscillators.
  • RTD-LD and RTD-PD circuits for generating optical and electrical chaotic carriers.
  • Novel optoelectronic oscillators (OEO) based on the integration of RTD-PDs with laser diodes.
  • Low phase noise optoelectronic voltage/optical controlled oscillators. 

 

Publications 
Invited presentations 
Patent applications 

Spin-offs  
Prizes and grants  



Publications

 

Chapters in books  

 

- Optoelectronic Oscillators for Communication Systems, B. Romeira, J. M. L Figueiredo, Book Chapter In: Emerging Trends in Technological Innovation, Camarinha-Matos, Luis M.; Pereira, Pedro; Ribeiro, Luis (Eds.), IFIP International Federation for Information Processing, Vol. 314, ISBN: 978-3-642-11627-8, Springer. (PDF)


- Resonant Tunnelling Optoelectronic Circuits, J. M. L. Figueiredo, B. Romeira, T. J. Slight, C. N. Ironside, Book Chapter In: Advances in Optical and Photonic Devices, Ki Young Kim (Ed.), ISBN 978-953-7619-76-3, INTECH. (PDF)

 
- Optoelectronic switching in semiconductor waveguides incorporating a resonant tunneling diode, J. M. L. Figueiredo, A. R. Boyd, C. R. Stanley, C. N. Ironside, and A. M. P. Leite, OSA Trends in Optics and Photonics, Vol. 32, Photonics in Switching, Paul R. Prucnal and Daniel J. Blumenthal, eds, Optical Society of America, Washington, DC 2000. Reprinted from Photonics in Switching Conference, 1999 Tecnical Digest. (PDF)

 

Articles in international journals 

 

- A Self-Synchronized Optoelectronic Oscillator based on an RTD Photo-Detector and a Laser Diode, B. Romeira, K. Seunarine, C. N. Ironside, A. E. Kelly, J. M. L. Figueiredo, Photon. Technol. Lett., 23 (16), pp. 1148-1150, 2011. (PDF)  JCR® impact factor (2010): 1.987
 
- DC Characterization of Tunnel Diodes Under Stable Non-Oscillatory Circuit Conditions, L. Wang,  J. M. L. Figueiredo, C. N. Ironside, E. Wasige, IEEE Transactions on Electron Devices, 58 (2), pp. 343-347, 2011. (PDF)  JCR® impact factor (2010): 2.255
 
- Optical Control of a Resonant Tunneling Diode Microwave-Photonic Oscillator, B. Romeira, J. M. L. Figueiredo, C. N. Ironside, A. E. Kelly, T. J. Slight, IEEE Photonics Technology Letters, vol. 22, no. 21, pp. 1610-1612, 2010. (PDF)    JCR® impact factor (2010): 1.987
 
- Chaotic Dynamics in Resonant Tunneling Optoelectronic Voltage Controlled Oscillators, B. Romeira, J. M. L. Figueiredo, C. N. Ironside, T. J. Slight, IEEE Photonics Technology Letters, vol. 21, no. 24, pp. 1819-1821, 2009. (PDF)    JCR® impact factor (2010): 1.987
 
- Nonlinear Dynamics of Resonant Tunneling Optoelectronic Circuits for Wireless/Optical Interfaces, B. Romeira, J. M. L. Figueiredo, T. J. Slight, L. Wang, E. Wasige, C. N. Ironside, A. E. Kelly, R. Green,IEEE Journal of Quantum Electronics, vol. 45, no. 11, pp. 1436-1445, 2009. (PDF)  JCR® impact factor (2010): 2.477
 
- Synchronization and Chaos in a Laser Diode Driven by a Resonant Tunneling Diode, Bruno Romeira, José M. L. Figueiredo, Thomas J. Slight, Liquan Wang, Edward Wasige, Charles N. Ironside, José M. Quintana, and Maria J. Avedillo, IET Optoelectronics 2 (6), 211-215 (2008). (PDF)   JCR® impact factor (2010): 1.105
 
- A Liénard Oscillator Resonant Tunnelling-Laser Diode Hybrid Integrated Circuit: Model and Experiment, T. J. Slight, B. Romeira, L. Wang, J. M. L. Figueiredo, E. Wasige, and C. N. Ironside, IEEE J. Quant. Electron. 44 (12), 1158-1163 (2008). (PDF)  JCR® impact factor (2010): 2.477
 
- Self-oscillation and period adding from a resonant tunnelling diode – laser diode circuit, J. M. L. Figueiredo, B. Romeira, T. J. Slight, L. Wang, E. Wasige, and C. N. Ironside, Electron. Lett. 44 (14), 876-877 (2008). (PDF)  JCR® impact factor (2010): 1.001
 
- Coherent approach to transport and noise in double-barrier resonant diodes, V.  Ya. Aleshkin, L. Reggiani, N. V. Alkeev, V. E. Lyubchenko, C. N. Ironside, J. M. L. Figueiredo, and C. R. Stanley, Phys. Rev. B, 70, 115321 (2004). (PDF)  JCR® impact factor (2010): 3.772
 
- Giant suppression of shot noise as signature of coherent transport in double barrier resonant diodes, V.Ya. Aleshkin, L. Reggiani, N.V. Alkeev, V.E. Lyubchenko, C.N. Ironside, J.M.L. Figueiredo, C.R. Stanley, Semicond. Sci. Technol., 19 4, S161-S163 (2004). (PDF)  JCR® impact factor (2010): 0.988
 
- Modeling of Light Sensitive Resonant-Tunneling-Diode Devices, I. J. S. Coêlho, J. F. Martins-Filho, J. M. L. Figueiredo, and C. N. Ironside, Journal of Applied Physics, 95, 12, pp. 8258-8263 (2004). (PDF)   JCR® impact factor (2010): 2.064
 
- Reply to Comment on "Giant suppression of shot-noise in double barrier resonant diode: a signature of coherent transport", V.Ya. Aleshkin, L. Reggiani, N.V. Alkeev, V.E. Lyubchenko, C.N. Ironside, J.M.L. Figueiredo, C.R.Stanley, Semicond. Sci. Technol. 19, 5, pp. 665-666 (2004). (PDF)  JCR® impact factor (2010): 1.323
 
- Giant suppression of shot noise in double barrier resonant diode: a signature of coherent transport, V.Ya. Aleshkin, L. Reggiani, N.V. Alkeev, V.E. Lyubchenko, C.N. Ironside, J.M.L. Figueiredo, C.R. Stanley, Semicond. Sci. Technol. 18, 6, L35-L38 (2003). (PDF)  JCR® impact factor (2010): 1.323
 
- Ultralow voltage resonant tunnelling diode electroabsorption modulator, J. M. L. Figueiredo, C. N. Ironside, and C. R. Stanley, Journal Modern Optics, 49, 5, pp. 939 - 945 (2002). (PDF)  JCR® impact factor (2010): 0.988
 
- Current noise in resonance tunnel diodes based on InGaAlAs heterostructures, V. Alkeev, V. E. Lyubchenko, C. N. Ironside, J. M. L. Figueiredo, C. R. Stanley, Journal of Communications Technology and Electronics, 47, 2, pp. 238-231 (2002). (PDF)  JCR® impact factor (2010): 0.339
 
- Electric field switching in a resonant tunneling diode electroabsorption modulator, J. M. L. Figueiredo, C. N.  Ironside, and C. R. Stanley, IEEE Journal of Quantum Electronics, 37, 12, pp. 1547-1552 (2001). (PDF)  JCR® impact factor (2010): 2.477
 
- Superhigh-Frequency Characteristics of Optical Modulators on the Basis of InGaAlAs Resonance-Tunnel Heterostructures,  N. V. Alkeev, V. E. Lyubchenko, C. N. Ironside, J. M. L. Figueiredo, and C. R. Stanley, Journal of Communications Technology and Electronics, Vol. 45, No. 8, pp. 911-914 (2000). (PDF)  JCR® impact factor (2010): 0.339
 
- Optical modulation at around 1550 nm in a InGaAlAs optical waveguide containing a InGaAs/AlAs resonant tunneling diode,  J. M. L. Figueiredo, A. R. Boyd, C. R. Stanley, C. N. Ironside, S. G. McMeekin, and A. M. P. Leite, Applied Physics Letters, Vol. 75, No. 22, pp. 3443-3445 (1999). (PDF)   JCR® impact factor (2010): 3.820 
 
- Optical modulation in a resonant tunneling relaxation oscillator, J. M. L. Figueiredo, C. R. Stanley, A. R. Boyd, C. N. Ironside, S. G. McMeekin, and A. M. P. Leite, Applied Physics Letters, Vol. 74, No. 9, pp. 1197-1199 (1999). (PDF)  JCR® impact factor (2010): 3.820


Articles in conference proceedings   


- Nonlinear dynamics of a Liénard delayed-feedback optoelectronic oscillator, B. Romeira, J. M. L. Figueiredo, C. N. Ironside, K. Seunarine, and J. Javaloyes, Joint conference Third International Workshop on Nonlinear Dynamics and Synchronization (INDS'11) and Sixteenth International Symposium on Theoretical Electrical Engineering (ISTET'11), Session: Nonlinear Dynamics, chaos and Synchronization - 2, Klagenfurt, Austria, July 25-27, 2011. (PDF) 

- Clock Recovery of an Injection-Locked Resonant Tunneling Diode Microwave-Photonics Oscillator, B. Romeira, L. M. Pessoa, H. M. Salgado, S. Silva, J. M. L. Figueiredo, 13th International Conference on Transparent Optical Networks (ICTON 11), paper We.C5.6, Stockholm, Sweden, June 26-30, 2011. (PDF)

- A Liénard optoelectronic oscillator with time-delayed feedback, B. Romeira, K. Seunarine, C. N. Ironside, J. Javaloyes, A. E. Kelly, J. M. L. Figueiredo, The European Conference on Lasers and Electro-Optics (CLEO) and the European Quantum Electronics Conference (EQEC) Conference Digest, OSA Technical Digest (CD) (Optical Society of America, 2011), paper CI3.2, Munich, Germany, May 22-26, 2011. (PDF)

- Review of optoelectronic oscillators based on modelocked lasers and resonant tunneling diode optoelectronics, C. N. Ironside, M. Haji, L. Hou, J. Akbar, A. E. Kelly, K. Seunarine, B. Romeira, J. M. L. Figueiredo, International Conference on Applications of Optics and Photonics (AOP11), Proc. SPIE 8001, 80011T, Braga, Portugal, May 3-7, 2011. (PDF)

- Optoelectronic Oscillator Topologies based on Resonant Tunneling Diode Fiber Optic Links, B. Romeira, J. M. L Figueiredo, K. Seunarine, C. N. Ironside,  International Conference on Applications of Optics and Photonics (AOP11), Proc. SPIE 8001, 80011T, Braga, Portugal, May 3-7, 2011. (PDF)

- Applications of laser diode sources with integrated resonant tunnelling diode technology, C. N. Ironside, B. Romeira, K. Seunarine, , A. E. Kelly, T. J Slight, and J. M. L. Figueiredo, Photonex2010 – Industry Programme, C6: Novel Sources and detectors, Telford, UK, 3-4 November 2010. (PDF)

- Optoelectronic Oscillators for Communication Systems, B. Romeira and J. M. L Figueiredo, 1st IFIP Doctoral Conference on Computing, Electrical and Industrial Systems (DoCEIS’10), Costa de Caparica, Portugal, February 22-24, 2010. (PDF)

- An Optoelectronic Oscillator based on a Resonant Tunneling Diode Photo-Detector Integrated Chip, B. Romeira, K. Seunarine, C. N. Ironside, A. E. Kelly, T. J Slight, J. M. L. Figueiredo, The 23rd Annual Meeting of the IEEE Photonics Society, paper MD4, Denver, Colorado, USA, 7-11 November, 2010. (PDF) 

- Microwave-Photonic Oscillators for Radio-over-Fibre Access Networks, J. M. L. Figueiredo, B. Romeira, T. J. Slight, C. N. Ironside, VIII Symposium On Enabling Optical Networks and Sensors (SEON 10), FEUP, Porto, Portugal, 2010. (PDF)

- Microwave Photonic Oscillators for Femtocellular Access Networks, B. Romeira, T. J. Slight, A. E. Kelly, C. N. Ironside, J. M L Figueiredo, 15th European Conference on Networks and Optical Communications (NOC 2010), Components and modulation strategies, Faro-Algarve, Portugal, 8-10 Junho 2010. (PDF)

- Optical injection locking of a resonant tunneling diode - optical waveguide photo-detector, Bruno Romeira, José Figueiredo, C. N. Ironside, A. E. Kelly, T. J. Slight, 15th European Conference on Integrated Optics (ECIO 2010), Cambridge, April 7-9, 2010. (PDF)

- Resonant tunneling diode opto-electronic integrated circuits (Invited Paper), Charles N. Ironside, José M. L. Figueiredo, Bruno Romeira, Thomas J. Slight, Liquan Wang, Edward Wasige, Photonics West 2010, Nanotechnologies in Photonics, 7608: Quantum Sensing and Nanophotonic Devices VII, Session 4:  Quantum Structures and Devices I, Paper 7608-16. (PDF)

- Wireless Injection Locking and Phase Noise Reduction in a Semiconductor Laser driven by a Resonant Tunnelling Diode Nonlinear Oscillator, B. Romeira, J. M. L Figueiredo, T. J. Slight, L. Wang, E. Wasige, and C. N. Ironside, The European Conference on Lasers and Electro-Optics (CLEOEUROPE 2009) (14 - 19 June, Munich, Germany), Session Title: Fixed and Wireless Access Networks, paper CI3.1. (PDF)

- Wireless/Photonics Interfaces Based on Resonant Tunneling Diode Optoelectronic Oscillators, B. Romeira, J. M. L Figueiredo, T. J. Slight, L. Wang, E. Wasige, and C. N. Ironside, Conference on Lasers and Electro-Optics and Quantum Electronics and Laser Science (CLEO/QELS 2009) (May 31 – June 5, 2009, Baltimore, Maryland, USA), Session Title: Microwave Photonics, paper CTuT4. (PDF)

- Wireless-photonics-wireless interfaces based on resonant tunneling diode optoelectronic oscillators, J. M. L. Figueiredo, C. N. Ironside, B. Romeira, J. M. L Figueiredo, T. J. Slight, L. Wang, E. Wasige, European workshop on photonics solutions for wireless, access, and in-house networks (18-20 May 2009, Duisburg, Germany), Session Title: . (PDF PDF)

- Resonant tunneling diode-laser diode optoelectronic integrated circuit operating as a voltage controlled oscillator  (Invited Paper), C. N. Ironside, J. M. L. Figueiredo, B. Romeira, T. J. Slight, E. Wasige, L. Wang, Microtechnologies for the New Millennium - Conference: Photonic Materials, Devices, and Applications (4 - 6 May 2009, Maritim Hotel, Dresden Germany), Session 8B:  Photonic Devices, Paper 7366-39. (PDF)

- Wireless to Optical Frequency Locking and Chaos using a Resonant Tunnelling - Laser Diode Circuit, B. Romeira, J. M. L. Figueiredo, T. J. Slight, L. Wang, E. Wasige, and C. N. Ironside, 2009 IEEE/LEOS Winter Topical Meetings (WIN2009), Innsbruck, Austria, 12 -14 January 2009. (PDF)

- Synchronizing Optical to Wireless Signals Using a Resonant Tunneling Diode Laser Diode Circuit, B. Romeira, J. M. L. Figueiredo, T. J. Slight, L. Wang, E. Wasige, and C. N. Ironside, The 21st Annual Meeting of The IEEE Lasers and Electro-Optics Society (LEOS 2008) Newport Beach, California, 9-13 November 2008. (PDF)

- Optoelectronic Integration of a Resonant Tunneling Diode and a Laser Diode, B. Romeira, J. M. L. Figueiredo, T. J. Slight, L. Wang, E. Wasige and C. N. Ironside, 14th European Conference on Integrated Optics (ECIO 2008), Eindhoven, The Netherlands, June 11-13, 2008. (PDF)

- Observation of Frequency Division and Chaos Behavior in a Laser Diode driven by a Resonant Tunneling Diode, Bruno Romeira, José M. L. Figueiredo, Thomas J. Slight, Liquan Wang, Edward Wasige, Charles N. Ironside, José M. Quintana3, and Maria J. Avedillo3, Conference on Lasers and Electro-Optics and Quantum Electronics and Laser Science (CLEO/QELS 2008), San Jose, California, May 4-9 2008. (PDF)

- Synchronization and Chaos in a Laser Diode Driven by a Resonant Tunneling Diode, Bruno Romeira, José M. L. Figueiredo, Thomas J. Slight, Liquan Wang, Edward Wasige, Charles N. Ironside, José M. Quintana, and Maria J. Avedillo, Conference on Semiconductor and Integrated Optoelectronics (SIOE 2008), Cardiff, Wales, UK, 31 March - 2 April 2008. (PDF)

- Generation of optical chaotic signals, B. Romeira, J. M. L. Figueiredo, T. J. Slight, L. Wang, E. Wasige, C. N. Ironside, 16th Conferência Nacional de Física (FÍSICA 08), Lisboa, Portugal, 03-06 Setembro 2008. (PDF)

- Novel Optoelectronics Circuits Employing Resonant Tunnelling Diodes, B. Romeira, J. M. L. Figueiredo, T. J. Slight, L. Wang, E. Wasige, C. N. Ironside, J. M. Quintana, M. J. Avedillo,  2nd International Conference on Advanced Nano Materials (ANM 08) , Aveiro, Portugal, 22-25 Junho 2008. (PDF)

- Chaotic Behavior in Optoelectronic Circuits Employing Resonant Tunneling Diodes, B. Romeira, J. M. L. Figueiredo, T. J. Slight, L. Wang, E. Wasige, C. N. Ironside, J. M. Quintana, M. J. Avedillo, 2nd Workshop on Low-Dimensional Structures: Properties and Applications (WLDS 08), Aveiro, Portugal, 31 Janeiro-01 Fevereiro 2008. (PDF)

- Optoelectronic integrated circuits incorporating negative differential resistance devices (invited), J. M. L. Figueiredo, B. Romeira, T. J. Slight, L. Wang, E. Wasige, and C. N. Ironside, V Symposium On Enabling Optical Networks and Sensors (SEON 2007), Aveiro, Portugal, 29 Junho 2007. (PDF)

- Optoelectronic characterization of structures based on tunnel junctions, tunnel barriers and quantum dots, J. M. L. Figueiredo, B. Romeira, A. Brázio, International School on Structural Characterization of Nanostructures (ISSCN 07) , Aveiro, Portugal, 25-27 Janeiro 2007. (PDF)

- Modelling of a Resonant Tunnelling Diode Optical Waveguide Modulator, J. J. N. Calado, J. M. L. Figueiredo, 21st International Conference on Amorphous and Nanocrystalline Semiconductors, ICANS 21, Lisboa, Setembro de 2005. (PDF)

- Modeling of a Resonant Tunneling Diode Optical Modulator, J. J. N. Calado, J. M. L. Figueiredo, and C. N. Ironside, The 2005 International Microwave and Optoelectronics Conference (IMOC), Julho de 2005. (PDF)

- Development of an optical fiber imaging system for nanocrystal-biosensors, R. Baltazar, J. M. L. Figueiredo, G. N. M. Ferreira, EuroConference on Biomaterials, Biosensors and Analytical Techniques, 18-23 June 2005. (PDF)

- Modelling of a modulator based on resonant tunnelling diode switching, J. J. N. Calado, J. M. L. Figueiredo, and C. N. Ironside, 12th IEEE International Symposium on Electron Devices for Microwave and Optoelectronic Applications, 8 - 9 November (2004). (PDF)

- Experimental measurements of the ridge spacing influence on the frequency response and optical spectrum of laterally coupled laser diodes, Horacio Lamela, Rui Santos, Guillermo Carpintero, Jean-Pierre Vilcot, A. Barsella, J. Figueiredo, Markus Pessa, Proc. SPIE Vol. 4986, Physics and Simulation of Optoelectronic Devices XI; Marek Osinski, Hiroshi Amano, Peter Blood; Eds., pp. 86-91 (2003). (PDF)

- Optical modulators employing resonant tunneling diodes, C. N. Ironside, J. M. L. Figueiredo, and C. R. Stanley, 26th Workshop on Compound Semiconductor Devices and Integrated Circuits held in Europe, Conference Proceedings, May 21- 26 (2002). (PDF)

- The Electric Field Switching in Resonant Tunneling Diode Electroabsorption Modulator, J. M. L. Figueiredo, C. N. Ironside, and C. R. Stanley, Optical Fiber Communication Conference (OFC), Conference Proceedings Vol. 3, pp. wdd62-1 wdd62-3 (2001). (PDF)

- Ultra-broad-band photodetection in a resonant tunneling device, Martins JF, de Araujo RE, Gomes ASL, Leite JRR, Figueiredo JML, Stanley CR, Ironside CN, SBMO - IEEE MTT-S International Microwave and Optoelectronics Conference, AUG 06-10, IMOC 2001, pp. 325-328. (PDF)

- Ultralow voltage resonant tunnelling diode electroabsorption modulator, J.M.L. Figueiredo, C.N. Ironside, C.R. Stanley, A. Meikle, 15th National Quantum Electronics and Photonics Conference (2001). (PDF)

- Visible to Mid-Infrared Photodetection in a Resonant Tunneling Device, J. F. Martins-Filho, R. E. de Araújo, A. S. L. Gomes, J. M. L. Figueiredo, C. R. Stanley, and C. N. Ironside, Conference on Lasers and Electro-Optics - Europe (CLEO/Europe) Focus Meetings 2001, Conference Proceedings (2001). (PDF)

- Resonant Tunneling Device as a Visible to Mid-Infrared Photodetector R. E. de Araujo, A. S. L. Gomes, J. R. Rios Leite, J. F. Martins-Filho, J. M. L. Figueiredo, C. R. Stanley, C. N. Ironside, XXIV encontro nacional de física da matéria condensada, São Lourenço - MG, 15 a 19 de Maio de 2001. (PDF)

- High Photodetection Gain in a Resonant Tunneling Diode Waveguide Modulator/Detector, J. F. Martins-Filho, R. E. de Araújo, A. S. L. Gomes, J. M. L. Figueiredo, C. R. Stanley, and C. N. Ironside, in Proceedings IEEE LEOS 2000, 13th Annual Meeting IEEE Lasers and Electro-Optics Society (LEOS-2000), Vol. 1, pp. 15 -16. (PDF)

-  Electric field switching in a resonant tunneling diode electroabsorption modulator, J. M. L. Figueiredo, C. N. Ironside, and C. R. Stanley, 8th IEEE International Symposium on High Performance Electron Devices for Microwave and Optoelectronic Applications (EDMO 2000), University of Glasgow, 2000, Conference Proceedings, pp. 146 -151. (PDF)

-  40 dB Photodetection Gain in a Resonant Tunneling Diode Optical Waveguide, J. F. Martins-Filho, R. E. de Araujo, A. S. L. Gomes, J. M. L. Figueiredo, C. R. Stanley, and C. N. Ironside, IX Simpósio Brasileiro de Microondas e Optoeletrônica, João Pessoa - PB, Brazil, 7-10 August 2000, Conference Proceedings. (PDF)

- Resonant Tunneling diode electro-absorption waveguide modulator operating at around 1550 nm, J. M. L. Figueiredo, A. M. P. Leite, C. N. Ironside, C. R. Stanley, S. G. McMeekin, K. Bouris, and D. G. Moodie, Conference on Lasers and Electro-Optics (CLEO 2000), 2000, OSA Technical Digest Series, pp. 596-597. (PDF)

- Microwave properties of InGaAlAs resonant-tunneling optical modulators, V. E. Lyubchenko, N. V. Alkeev, C. N. Ironside, J. M. L. Figueiredo, C. R. Stanley, 13th International Conference on Microwaves, Radar and Wireless Communications (MIKON-2000), Conference Proceedings Vol. 1, pp. 140 -143, 2000. (PDF)

- Self-oscillation in a resonant tunnelling diode electroabsorption modulator, J. M. L. Figueiredo, C. N. Ironside, A. R. Boyd, C. R. Stanley, A. M. P. Leite, and S. G. McMeekin, Conference on Lasers and Electro-Optics (CLEO 1999), OSA Technical Digest Series, Optical Society of America, pp. 125-126. (PDF)

-  Optical modulation at around 1550nm in a InGaAlAs optical waveguide containing a InGaAs/AlAs resonant tunnelling diode, J. M. L. Figueiredo, A. M. P. Leite, C. N. Ironside, A. R. Boyd, C. R. Stanley, and S. G. McMeekin, Quantum Electronics & Photonics Conference (QE-14), 6-9 Sept. 1999, UK, Conference Proceedings, paper 16.2. (PDF)

- Optoelectronic switching in semiconductor waveguides incorporating a resonant tunneling diode, J. M. L. Figueiredo, A.R. Boyd, C.R. Stanley, C.N. Ironside, and A.M.P. Leite, Photonics in Switching Conference, 1999 Technical Digest, Optical Society of America, paper JWB3. (PDF)

- High speed optical waveguide modulator based on resonant tunnelling effect, J. M. L. Figueiredo, C. N. Ironside, C. R. Stanley, and A. M. P. Leite, Conference on Lasers and Electro-Optics - Europe (CLEO/Europe 1998), Conference Proceedings 1998 IEEE Catalog No. 98TH 8326, pp. 20-20. (PDF)

- High frequency optical modulation in a resonant tunneling transmission line oscillator, J. M. L. Figueiredo, C. N. Ironside, A.R. Boyd, C. R. Stanley, and A. M. P. Leite, 6th IEEE International Workshop on High Performance Electron Devices for Microwave and Optoelectronic Applications (EDMO'98), Conference Proceedings 1998 IEEE Catalog No. 98TH8345, pp. 240-245. (PDF)

- Integration of a resonant tunneling diode and an optical waveguide to form an electroabsorption modulator with a large bandwidth to drive voltage ratio, J. M. L. Figueiredo, A. M. P. Leite, C. R. Stanley, and C. N. Ironside, Conference on Lasers and Electro-Optics 1998, Vol. 6, OSA Technical Digest Series, Optical Society of America, pp. 263-264. (PDF)

- Modulação Óptica a Alta Frequência Usando o Efeito de Túnel Ressonante, J. M. L. Figueiredo, C. N. Ironside, e A. M. P. Leite, Conferencia Nacional de Física, 1998, Porto, Actas, pp. - .

- High Speed Electroabsorption Modulator by Integration of a RTD with an Optical Waveguide, J. M. L. Figueiredo, C. N. Ironside, A. M. P. Leite, and C. R. Stanley, Best student poster paper, 5th IEEE International Workshop on High Performance Electron Devices for Microwave and Optoelectronic Applications (EDMO'97), Conference Proceedings 1997 IEEE Catalog No. 97TH8305, pp. 352-357. (PDF) 

- Integration of a RTD with an Optical Waveguide to Form a High Speed Electroabsorption Modulator, J. M. L. Figueiredo, C. N. Ironside, A. M. P. Leite, and C. R. Stanley, IEE Colloquium on Optoelectronic Integration and Switching, Conference Proceedings 1997 IEE Reference No. 1997/372, pp. 6/1-6/6. (PDF)

- Design and Fabrication of Low Loss Passive Polymeric Waveguides Based on Mass Replication Technique, A. Neyer, T. Knoche, L. Muller, P. C. Lee, J. H. Kim, M. A. Andrade, J. Carvalho, J. M. L. Figueiredo, and A. P. Leite, 6th European Conference on Integrated Optics (ECIO 1993), Conference Proceedings, pp. 9-10. (PDF)

- POPCORN: A Novel Technology for Polymer Based Integrated Optics, H. Kragl representing the consortium partners in the project CEC-RACE II POPCORN, 6th European Conference on Integrated Optics (ECIO'93), Conference Proceedings, pp. 9-24. (PDF) 


Invited presentations  

- Microwave-Photonic Oscillators for Radio-over-Fibre Access Networks, J. M. L. Figueiredo, B. Romeira, T. J. Slight, C. N. Ironside, VIII Symposium On Enabling Optical Networks and Sensors (SEON 10), FEUP, Porto, Portugal, 2010. (PDF)

- Optoelectronic integrated circuits incorporating negative differential resistance devices (invited), J. M. L. Figueiredo, B. Romeira, T. J. Slight, L. Wang, E. Wasige, and C. N. Ironside, V Symposium On Enabling Optical Networks and Sensors (SEON 2007), Aveiro, Portugal, 29 Junho 2007. (PDF)
  

Patent applications  

 

- Interfaces and Method For Wireless-Optical and Optical-Wireless Conversion, J. M. L. Figueiredo, B. Romeira, C. N. Ironside, T. J. Slight, 2010, GB2465184-A; WO2010052481-A1 (data de publicação 14-05-2010). (PDF)


- Optoelectronic Device, C. N. Ironside,  J. M. L. Figueiredo, US 20040247218 A1 (data de publicação 9-12-2004). (PDF)


- Improved Optoelectronic Device, C. N. Ironside, J. M. L. Figueiredo, The Patent Cooperation Treaty Gazette, 2002/45, WO02088834, (data de publicação 7-11-2002); JP2004524589T (2004-08-12), EP1381909 (2004-01-21), WO02088834 A3 (2003-04-17), CA2445566 (2002-11-07), WO02088834 A2 (2002-11-07). This technology was licensed to Essient Photonics Ltd, a spin-out from Glasgow University, launched in 2002. (PDF)

  
- Improved Optoelectronic Device, C. N. Ironside, C. R. Stanley, J. M. L. Figueiredo, The Patent Cooperation Treaty Gazette, 2000/48, WO0072383, (data de publicação 30-11-2000); CA2398287 (2002-07-24), EP1183736 (2000-11-30), AU5092500 (2000-11-30), WO0072383 (2000-11-30). This technology was licensed to Essient Photonics Ltd, a spin-out from Glasgow University, launched in 2002. (PDF)



Spin-offs

- Co-founder of Essient Photonics, a spun-out of the University of Glasgow in 2002.
  

Prizes and grants 

- Proof of Concept Fund award - Supporting Commercialization in Scotland, Scottish Enterprise, Scottish Executive, UK, 2001.

- Best student poster paper, 5th IEEE International Workshop on High Performance Electron Devices for Microwave & Optoelectronic Applications (EDMO'97), King's College London, Reino Unido, 1997, atribuído em 23 de Novembro de 1998, durante a EDMO'98.

- PhD grant, FCT - Programa Praxis XXI, 1995.
- Master grant, JNICT - Programa Ciência, 1992.
- ERASMUS grant, União Europeia, 1991.
Faculdade de Ciências e Tecnologia, Universidade do Algarve, Campus de Gambelas, 8005-139 FARO, Portugal