Dr. Virginia Gomez Profile

Dr. Virginia Gomez

at Vrije Univ Brussel

SPIE Involvement:

Author

Publications (12)

Proceedings Article | 14 May 2010 Paper

Optical characterization of semiconductor microlenses using a Mach-Zehnder interferometer in the near-infrared region

H. Ottevaere, N. Vermeulen, V. Gomez, H. Thienpont

Proceedings Volume 7718, 77180N (2010) https://doi.org/10.1117/12.854690

KEYWORDS: Microlens, Interferometers, Silicon, Mach-Zehnder interferometers, Wavefront aberrations, Semiconductors, Silica, Micro optics, Beam splitters, Spherical lenses

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Proceedings Article | 11 August 2008 Paper

Interferometric method for in-situ monitoring of fiber insertion in 2D fiber connectors fabricated through Deep Proton Writing

Anna Pakula, Dariusz Lukaszewski, Slawomir Tomczewski, Leszek Salbut, Jürgen Van Erps, Virginia Gomez, Hugo Thienpont

Proceedings Volume 7064, 70640O (2008) https://doi.org/10.1117/12.794883

KEYWORDS: Connectors, Interferometry, Ferroelectric materials, Algorithms, Detection and tracking algorithms, Beam splitters, Polymethylmethacrylate, Light sources, Fabry–Perot interferometers, Laser interferometry

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Proceedings Article | 14 May 2008 Paper

Si moulds for glass and polymer microlenses replication

J. Albero, L. Nieradko, C. Gorecki, H. Ottevaere, V. Gomez, J. Pietarinen

Proceedings Volume 6992, 69920A (2008) https://doi.org/10.1117/12.783093

KEYWORDS: Etching, Silicon, Microlens, Glasses, Anisotropic etching, Semiconducting wafers, Photomasks, Polymers, Isotropic etching, Optical lithography

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Proceedings Article | 25 April 2008 Paper

Real time and in situ monitoring of microlenses fabricated with deep proton writing

Virginia Gomez, Heidi Ottevaere, Hugo Thienpont

Proceedings Volume 6995, 69950L (2008) https://doi.org/10.1117/12.780203

KEYWORDS: Microlens, Interferometers, Polymethylmethacrylate, Microlens array, Mach-Zehnder interferometers, Fabrication, Polymers, Beam splitters, Calibration, Geometrical optics

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Proceedings Article | 2 October 2006 Paper

Rapid micro-optical prototyping technology for fabricating optical interconnection modules at the MCM and PCB level

C. Debaes, M. Vervaeke, J. Van Erps, L. Desmet, H. Ottevaere, V. Gomez, P. Vynck, S. Van Overmeire, Y. Ishii, A. Hermanne, H. Thienpont

Proceedings Volume 6393, 639302 (2006) https://doi.org/10.1117/12.687168

KEYWORDS: Polymethylmethacrylate, Optical interconnects, Prototyping, Free space optics, Ions, Waveguides, Connectors, Etching, Monte Carlo methods, Tolerancing

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Proceedings Article | 21 April 2006 Paper

Cylindrical microlenses fabricated by deep proton writing

Virginia Gómez, Bart Volckaerts, Pedro Vynck, Heidi Ottevaere, Hugo Thienpont

Proceedings Volume 6185, 618517 (2006) https://doi.org/10.1117/12.662500

KEYWORDS: Microlens, Microlens array, Spherical lenses, Profilometers, Cylindrical lenses, Mach-Zehnder interferometers, Polymethylmethacrylate, Photonics, Standards development, Diffusion

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Proceedings Article | 28 February 2006 Paper

Low-cost plastic micro-optics for board-level optical interconnections

C. Debaes, M. Vervaeke, B. Volckaerts, J. Van Erps, L. Desmet, H. Ottevaere, P. Vynck, V. Gomez, A. Hermanne, H. Thienpont

Proceedings Volume 6126, 61260M (2006) https://doi.org/10.1117/12.660141

KEYWORDS: Optical interconnects, Free space optics, Waveguides, Prototyping, Monte Carlo methods, Error analysis, Tolerancing, Micro optics, Connectors, Packaging

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Proceedings Article | 15 October 2005 Paper

Enhancing the quality of optical grade Germanium: novel techniques and dedicated instrumentation

Heidi Otteavare, Steven Brantegem, Virginia Gomez, Erik Stijns, Hugo Thienpont, Igor Romandic, Jan Van Nylen, Hans Vercammen, Dirk Vyncke

Proceedings Volume 5990, 59900B (2005) https://doi.org/10.1117/12.633533

KEYWORDS: Absorption, Germanium, Surface roughness, Atomic force microscopy, Surface finishing, Polishing, Profilometers, Refractive index, Calorimetry, Sensors

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Proceedings Article | 27 August 2005 Paper

Real-time in situ sag characterization of microlenses fabricated with Deep Lithography with Protons

Virginia Gomez, Heidi Ottevaere, Bart Volckaerts, Hugo Thienpont

Proceedings Volume 5858, 585803 (2005) https://doi.org/10.1117/12.612579

KEYWORDS: Microlens, Mach-Zehnder interferometers, Digital Light Processing, Interferometers, Lithography, Spherical lenses, Beam splitters, Geometrical optics, Calibration, Polymethylmethacrylate

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Proceedings Article | 8 September 2004 Paper

The fabrication and characterization of plastic microlens arrays by deep lithography with protons

Heidi Ottevaere, Virginia Gomez, Bart Volckaerts, Michael Vervaeke, Pedro Vynck, Alex Hermanne, Hugo Thienpont

Proceedings Volume 5453, (2004) https://doi.org/10.1117/12.546452

KEYWORDS: Microlens, Microlens array, Digital Light Processing, Polymethylmethacrylate, Diffusion, Lithography, Spherical lenses, Calibration, Polymers, Polymerization

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Proceedings Article | 1 September 2004 Paper

Study of optical feedback effects in an extremely short external cavity configuration

Krzysztof Koltys, Andrzej Tabaka, Virginia Gomez, Hugo Thienpont, Krassimir Panajotov

Proceedings Volume 5452, (2004) https://doi.org/10.1117/12.545059

KEYWORDS: Modulation, Semiconductor lasers, Laser resonators, Mirrors, Photodetectors, Modes of laser operation, Phase shift keying, Solids, Optical components, Fabry–Perot interferometers

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Proceedings Article | 6 July 2004 Paper

Semiconductor lasers for quantum sensing

Krassimir Panajotov, Mikel Arizaleta, Virginia Gomez, Krzysztof Koltys, Andrzej Tabaka, Marc Sciamanna, Irina Veretennicoff, Hugo Thienpont

Proceedings Volume 5359, (2004) https://doi.org/10.1117/12.518317

KEYWORDS: Vertical cavity surface emitting lasers, Polarization, Semiconductor lasers, Modulation, Switching, Picosecond phenomena, Reflectivity, Composites, Switches, Mirrors

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Semiconductor lasers can be used simultaneously as optical sources and optical sensors, as they are extremely sensitive to a small amount of coherent optical feedback. We present a survey on experimental results on optical feedback in semiconductor lasers and on different approaches to describe its effect on the laser properties. We show that for long and moderate long external cavities (hundreds of meters down to centimeters) the Lang-Kobayashi delay model, multiple delays and multimode delay rate equation models are in very good agreement with experiments on edge emitting lasers (EELs) and vertical-cavity surface-emitting lasers (VCSELs). We present examples of frequency and polarization mode hopping, periodic and quasiperiodic behavior, different routes to chaos, regular pulse packages, high frequency pulsations and stochastic and coherence resonance, that all have been experimentally and numerically demonstrated. Suitable models for studying laser diodes subject to optical feedback from extremely short external cavity, or ESEC (of the order of the wavelength) are the composite cavity and the multimode butt coupling models that either consider the field amplitudes after multiple reflections in the external cavity (EC) as stationary or treat the whole compound cavity at once. Numerical and experimental studies showed that optical feedback in ESEC leads to detectable change of the laser output power or the voltage drop over the laser for a small change of either the phase or the optical feedback strength. As an example, we discuss experimental and numerical results on spectral and polarization properties of VCSELs subject of insensitive optical feedback from ESEC. The wavelength and the current of polarization switching between the two linearly polarized fundamental modes of the VCSEL are periodically modulated with the external cavity length. High contrast polarization switching is thus possible for quarter-wavelength change of external cavity length. In the case of EEL we experimentally demonstrate that with changing the length of the EC the emitted power, the wavelength and the laser voltage are periodically modulated. We explain the longitudinal mode-hopping between the neighboring composite cavity modes followed by large jumps at the external cavity frequency splitting as a result of the spectral modulation of the effective losses of the composite cavity system.

Showing 5 of 12 publications

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