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Romuald Houdré

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Related publications (102)

Page 3 of 6

Terahertz Quantum Cascade Lasers based on two-dimensional photonic crystal resonators

Romuald Houdré, Marcella Giovannini, Lorenzo Sirigu

We demonstrate high spectral control from surface emitting THz Quantum Cascade Lasers based on a two-dimensional photonic crystal cavity. The perforated top metallic contact acts as an in plane resonator in a tight double-metal plasmonic waveguide providin ...

2008

Local infiltration of planar photonic crystals with UV-curable polymers

Romuald Houdré, Rolando Ferrini, Libero Zuppiroli, Laurent Balet, Pascale El-Kallassi

We present the local polymer infiltration of planar photonic crystal cavities via a maskless laser-writing technique. After the infiltration of the air holes with a UV-curable monomer a focused laser is used to locally polymerize the monomer in selected ho ...

2008

All-optical polariton transistor

Romuald Houdré

Although optical technology provides the best solution for the transmission of information, all-optical devices must satisfy several qualitative criteria to be used as logic elements. In particular, cascadability is difficult to obtain in optical systems, ...

Nature Publishing Group2013

High quality factor two dimensional GaN photonic crystal cavity membranes grown on silicon substrate

Romuald Houdré, Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Antonino Francesco Castiglia, Kirill Atlasov, Jacques Levrat, Georg Rossbach, Ulagalandha Perumal Dharanipathy, Noelia Vico Triviño

We report on the achievement of freestanding GaN photonic crystal L7 nanocavities with embedded InGaN/GaN quantum wells grown by metal organic vapor phase epitaxy on Si (111). GaN was patterned by e-beam lithography, using a SiO2 layer as a hard mask, and ...

American Institute of Physics2012

Terahertz photonic crystal quantum cascade lasers

Romuald Houdré, 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

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

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

2006

Near-infrared characterization of gallium nitride photonic-crystal waveguides and cavities

Romuald Houdré, Nicolas Grandjean, Jean-François Carlin, Ulagalandha Perumal Dharanipathy, Zhaolu Diao, Noelia Vico Triviño

We report the design and optical characterization of fully suspended wire waveguides and photonic crystal (PhC) membranes fabricated on a gallium nitride layer grown on silicon substrate operating at 1.5 mu m. W1-type PhC waveguides are coupled with suspen ...

Optical Society of America2012

Optical tuning of planar photonic crystals infiltrated with organic molecules

Romuald Houdré, Rolando Ferrini, Libero Zuppiroli, 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

Global Optimization of Ultrahigh-Q H0 Photonic Crystal Nanocavity in Silicon

Romuald Houdré, Vincenzo Savona, Momchil Minkov, Ulagalandha Perumal Dharanipathy, Mario Lucien Henri Tonin

The design of photonic crystal cavities has always presented a considerable challenge over the past two decades. In this work, a global optimization technique has been used to maximize the Q/V ratio of a simple H0 type nanocavity. The optimization is carri ...

Ieee2014

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

Si and III-nitride based photonic crystal cavities for optical trapping and non-linear optics

Romuald Houdré, Nicolas Villa, Jun Wang, Enrico Tartari

The project data will be organised in the following folder system : One main folder for the each subproject : GaN nonlinear optics and Optical trapping Each folder is organised in the following sub-folder system (not all may be used), each with a readme- ...

Zenodo2025

Coupling length of silicon-on-insulator directional couplers probed by Fourier-space imaging

Romuald Houdré, Nicolas Le Thomas, Jana Jágerská

We use a Fourier-space imaging technique relying on outcoupling grating probes to study the coupled mode interaction and dispersion properties of guided modes in silicon-on-insulator codirectional couplers. Our approach allows us to measure the mode splitt ...

American Institute of Physics2008

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

Spectral tuning and near-field imaging of photonic crystal microcavities

Romuald Houdré, Laurent Balet, Carl Zinoni

We experimentally observe a sizable and reversible spectral tuning of the resonances of a two-dimensional photonic crystal microcavity induced by the introduction of a subwavelength size glass tip. The comparison between experimental near-field data, colle ...

2008

Efficient second harmonic generation in a doubly resonant photonic crystal cavity based on a bound state in the continuum

Romuald Houdré, Nicolas Grandjean, Jean-François Carlin, Matteo Galli, Jun Wang

Making use of bound states in the continuum, we present experimental results on efficient second harmonic generation in photonic crystal cavities supporting doubly-resonant modes. The second harmonic emission is a vortex beam with radial polarization and e ...

IEEE2020

Strain engineering and strain measurement by spring tethers on suspended epitaxial GaN-on-Si photonic crystal devices

Romuald Houdré, Jun Wang

Suspended epitaxial gallium nitride (GaN) on silicon (Si) photonic crystal devices suffer from large residual tensile strain, especially for long waveguides, because fine structures tend to crack due to large stress. By introducing spring-like tethers, des ...

Iop Publishing Ltd2024

Propagation loss measurements and Fabry-Pérot mode analysis using out-of-plane light scattering in photonic crystals waveguides

Romuald Houdré, Rolando Ferrini, Liza Carol Andrea Dunbar, Benoît Lombardet

AIP American Institute of Physics2005

Ultra-wide-band structural slow light

Romuald Houdré, Vincenzo Savona, Momchil Minkov, Mohamed Sabry Abdel-Aliem Mohamed

The ability of using integrated photonics to scale multiple optical components on a single monolithic chip offers key advantages to create miniature light-controlling chips. Numerous scaled optical components have been already demonstrated. However, presen ...

Nature Research2018

Gram-type differentiation of bacteria with 2D hollow photonic crystal cavities

Romuald Houdré, El Hadji Malick Camara, Rita Therisod

Fast and label-free techniques to analyze viruses and bacteria are of crucial interest in biological and bio-medical applications. For this purpose, optofluidic systems based on the integration of photonic structures with microfluidic layers were shown to ...

2018

Fourier analysis of Bloch wave propagation in photonic crystals

Romuald Houdré, Rolando Ferrini, Liza Carol Andrea Dunbar, Benoît Lombardet

2005