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Romuald Houdré

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Publications associées (102)

Phase-sensitive Fourier space imaging of optical Bloch modes

Romuald Houdré, Nicolas Le Thomas

We present a phase-shifting holography method in k space that allows us to investigate the phase and amplitude of optical Bloch waves. The method is based on a Fourier space imaging technique combined with a Mach-Zehnder interferometer. Using a W3 photonic ...

2008

Grating-assisted superresolution of slow waves in Fourier space

Romuald Houdré, Nicolas Le Thomas

We present a far-ﬁeld optical technique allowing measurements of the dispersion relation of electromagnetic ﬁelds propagating under the light cone in photonic nanostructures. It relies on the use of a one-dimensional grating to probe the evanescent tail of ...

2007

Optical tuning of planar photonic crystals infiltrated with organic molecules

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Nicolas Le Thomas, Pascale El-Kallassi

The optical tuning of InP-based planar photonic crystals (PhCs) infiltrated with a photo-responsive liquid crystal system is presented. Photo-induced phase transitions of a liquid crystal blend doped with azobenzene molecules are used to tune the optical r ...

2007

Exploring light propagating in photonic crystals with Fourier optics

Romuald Houdré, Nicolas Le Thomas

Photonic crystals (PhCs) act on light in two different ways: confinement and modification of propagation. Both phenomena rely on the complex interplay between multiply scattered waves that can form what is known as a Bloch mode. Here, we present a techniqu ...

Optical Society of America2007

Dispersion properties of silicon nanophotonic waveguides investigated with Fourier optics

Romuald Houdré, Nicolas Le Thomas, Jana Jágerská

We experimentally investigate the dispersion relation of silicon-on-insulator waveguides in the 1.5 mu m wavelength range by using a technique based on far-field Fourier-space imaging. The phase information of the propagating modes is transferred into the ...

Optical Society of America2007

Characterization of the feature-size dependence in Ar/Cl2 chemically assisted ion beam etching of InP-based photonic crystal devices

Romuald Houdré, Rolando Ferrini

The authors address feature-size dependence in Ar/Cl2 chemically assisted ion beam etching (CAIBE) in the context of the fabrication of photonic crystal (PhC) structures. They systematically investigate the influence of various parameters such a ...

2007

Terahertz photonic crystal quantum cascade lasers

Romuald Houdré, Jérôme Faist, Hua Zhang

We combine photonic crystal and quantum cascade band engineering to create an in-plane laser at terahertz frequency. We demonstrate that such photonic crystal lasers strongly improve the performances of terahertz quantum cascade material in terms of thresh ...

Optical Society of America2007

Optical photonic crystal condensing device

Romuald Houdré, Benoît Lombardet, Liza Carol Andrea Dunbar

A photonic crystal structure for condensing electromagnetic radiation comprising a modulated square-shaped lattice and a corresponding condensing device are disclosed. ...

2006

Co-integration of gate-all-around MOSFETs and local silicon-on insulator optical waveguides on bulk silicon for GHz on-chip optical signaling

Didier Bouvet, Romuald Houdré, Vincent Pott, Mihai Adrian Ionescu, Kirsten Emilie Moselund, Christoph Eggimann, Nicolas Le Thomas

2006

Comparison of polarization splitter devices based on planar photonic crystals

Romuald Houdré, Jan-Robert Van Look, Vasily Zabelin

2006

Planar photonic crystals infiltrated with liquid crystals: optical characterization of molecule orientation

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Barbara Wild, Liza Carol Andrea Dunbar, Vasily Zabelin

Nematic liquid crystals are infiltrated into InP-based planar photonic crystals. Optical measurements as a function of temperature and polarization are used to study the average director field configuration in the nanometer-size holes: a planar equilibrium ...

Opt. Soc. America2006

Nanofabbricazione e caratterizzazione di microcavità a cristalli fotonici

Romuald Houdré, Benoît Lombardet, Nicolas Le Thomas

2006

Disorder-induced losses in planar photonic crystals

Romuald Houdré, Rolando Ferrini, David Leuenberger, Henri Benisty

The phenomenological approach introduced by Benisty et al. [Appl. Phys. Lett. 76, 532 (2000)] to model out-of-plane radiation losses in planar photonic crystals with a low vertical refractive index contrast is extended to the case of in-plane disorder. The ...

2006

Liquid crystal infiltration of InP-based planar photonic crystals

Romuald Houdré, Frank Nüesch, Libero Zuppiroli, Rolando Ferrini, Barbara Wild, Liza Carol Andrea Dunbar

A procedure for the infiltration of planar photonic crystals (PhCs) with liquid crystals (LCs) is presented. InP-based PhCs are infiltrated with the nematic LC-K15 in a specially designed high-vacuum chamber. The infiltration technique is validated and sys ...

AIP2006

Planar photonic crystals infiltrated with liquid crystals: tuning of the optical properties

Romuald Houdré, Libero Zuppiroli, Rolando Ferrini, Liza Carol Andrea Dunbar, Nicolas Le Thomas

2006

Feature size effects in chemically assisted ion beam etching of InP-based photonic crystals

Romuald Houdré, Rolando Ferrini

This work addresses feature size effects (the lag-effect and roughness development) in chemically assisted ion beam etching (CAIBE) etching of InP-based photonic crystals. Photonic crystal fields with varying hole size and periods were etched with differen ...

International Society for Optical Engineering, Bellingham WA, WA 98227-0010, United States2006

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Romuald Houdré

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Phase-sensitive Fourier space imaging of optical Bloch modes

Grating-assisted superresolution of slow waves in Fourier space

Optical tuning of planar photonic crystals infiltrated with organic molecules

Exploring light propagating in photonic crystals with Fourier optics

Dispersion properties of silicon nanophotonic waveguides investigated with Fourier optics

Characterization of the feature-size dependence in Ar/Cl2 chemically assisted ion beam etching of InP-based photonic crystal devices

Terahertz photonic crystal quantum cascade lasers

Optical photonic crystal condensing device

Co-integration of gate-all-around MOSFETs and local silicon-on insulator optical waveguides on bulk silicon for GHz on-chip optical signaling

Comparison of polarization splitter devices based on planar photonic crystals

Planar photonic crystals infiltrated with liquid crystals: optical characterization of molecule orientation

Nanofabbricazione e caratterizzazione di microcavità a cristalli fotonici

Disorder-induced losses in planar photonic crystals

Liquid crystal infiltration of InP-based planar photonic crystals

Planar photonic crystals infiltrated with liquid crystals: tuning of the optical properties

Feature size effects in chemically assisted ion beam etching of InP-based photonic crystals

A quantitative analysis of self-collimation effects in planar photonics crystals

Tuneable planar photonic crystals

Quantum dot photonic crystal microcavities at 1300 nm for telecom-wavelength single-photon sources

Photonic Crystals for Far-Infrared Wavelength Quantum Cascade Lasers