Dr. Christian Seassal Profile

Dr. Christian Seassal

at Ecole Centrale de Lyon

SPIE Involvement:

Conference Program Committee | Conference Chair | Author | Editor

Publications (40)

PROCEEDINGS ARTICLE | April 28, 2017

High-index dielectric optical metasurface with broken vertical symmetry (Conference Presentation)

Proc. SPIE. 10113, High Contrast Metastructures VI

KEYWORDS: Nanotechnology, Thin films, Plasmonics, Energy efficiency, Reflection, Dispersion, Dielectrics, Photonic crystals, Dielectric polarization, Current controlled current source

Read Abstract

The seminal work of R.B. Wood (1902), who discovered anomalies in the reflection spectra of sub-wavelength metallic gratings, triggered the field of plasmonics, where ultra-thin metallic sheets laterally structured on a sub-wavelength scale, so called metallic meta-surface, are under operation. The goal of the field has extended considerably in the last decades and has aimed at arbitrary control over the amplitude, phase and polarization… of light waves at the sub-wavelength scale. All-dielectric meta-surfaces consisting in nano-structured thin films of high index dielectric material, are attracting much attention, owing to their capability to achieve the same goal as their metallic counterpart, yet with an enhanced efficiency (especially for the manipulation of strong optical resonances), being freed from significant energy dissipation as encountered in metallic nano-structures. All dielectric meta-surfaces have been around for quite a while, but were named differently (photonic crystal dielectric membranes or high index contrast gratings). Unless rare exceptions, the literature reports on structures with non-broken vertical symmetry. In the present contribution we emphasize that breaking the vertical symmetry of all-dielectric meta-surfaces provides a widely enhanced degree of freedom for the control of spatial routes and spectral characteristics of light, which depends, to an essential extent, on the local density of photonic states in the thin nano-structured dielectric film. As an enlightening illustration, we concentrate on a dielectric meta-surface formed by two super-imposed identical evanescently coupled gratings, with adjustable gap distance and lateral alignment. We show that this remarkably simple meta-surface can provide any local density of photonic states from zero (Dirac cone) to infinity (ultra-flat zero curvature dispersion characteristics), as well as any constant density over an adjustable spectral range. Exemplifying applications will illustrate the great potential of this new approach.

PROCEEDINGS ARTICLE | February 16, 2017

Monolithic integration of hybrid III-V/Si lasers and Si-based modulators for data transmission up to 25Gbps

Proc. SPIE. 10106, Integrated Optics: Devices, Materials, and Technologies XXI

KEYWORDS: Transmitters, Laser sources, Mirrors, Waveguides, Etching, Electrodes, Silicon, Doping, Data transmission, Modulators, Semiconductor lasers, Photonic integrated circuits, Silicon photonics, Semiconducting wafers, Hybrid silicon lasers

Read Abstract

PROCEEDINGS ARTICLE | March 15, 2016

Widened photonic functionality of asymmetric high-index contrast/photonic crystal gratings

Proc. SPIE. 9757, High Contrast Metastructures V

KEYWORDS: Reflectors, Dispersion, Solar cells, Photons, Crystals, Silicon, Reflectivity, Vertical cavity surface emitting lasers, Nonlinear crystals, Charged particle optics

Read Abstract

PROCEEDINGS ARTICLE | February 27, 2015

Heterointegrated III-V/Si distributed feedback lasers

Proc. SPIE. 9365, Integrated Optics: Devices, Materials, and Technologies XIX

KEYWORDS: Quantum wells, Silica, Waveguides, Etching, Silicon, Semiconductor lasers, Integrated optics, Fiber couplers, Semiconducting wafers, Hybrid silicon lasers

Read Abstract

PROCEEDINGS ARTICLE | September 29, 2014

Absorption in photonic crystals: from order to disorder

Proc. SPIE. 9162, Active Photonic Materials VI

KEYWORDS: Thin films, Surface plasmons, Polarization, Solar cells, Silicon, Photonic crystals, Thin film solar cells, Silicon films, Photonic nanostructures, Absorption

Read Abstract

PROCEEDINGS ARTICLE | March 25, 2013

Nanostructured down-converter module for photovoltaic application

Proc. SPIE. 8620, Physics, Simulation, and Photonic Engineering of Photovoltaic Devices II

KEYWORDS: Photovoltaics, Nanostructuring, Solar energy, Ultraviolet radiation, Solar cells, Photons, Ions, Silicon, Photonic crystals, Absorption

Read Abstract

PROCEEDINGS ARTICLE | March 15, 2013

Double photonic crystal vertical-cavity surface-emitting lasers

Proc. SPIE. 8633, High Contrast Metastructures II

KEYWORDS: Reflectors, Mirrors, Modulation, Waveguides, Photons, Silicon, Reflectivity, Photonic crystals, Vertical cavity surface emitting lasers, Electromagnetism

Read Abstract

PROCEEDINGS ARTICLE | March 13, 2013

Ultra-compact vertical-cavity surface-emitting lasers using a double set of photonic crystal mirrors

Proc. SPIE. 8639, Vertical-Cavity Surface-Emitting Lasers XVII

KEYWORDS: Wafer-level optics, Mirrors, Optical lithography, Waveguides, Photons, Silicon, Photonic crystals, Semiconductor lasers, Vertical cavity surface emitting lasers, Silicon photonics

Read Abstract

SPIE Conference Volume | May 17, 2012

Photonic Crystal Materials and Devices X

PROCEEDINGS ARTICLE | April 25, 2012

Absorbing photonic crystals for mono-crystalline silicon thin film solar cells

Proc. SPIE. 8425, Photonic Crystal Materials and Devices X

KEYWORDS: Holography, Optical lithography, Solar cells, Silicon, Photonic crystals, Thin film solar cells, Silicon films, Aluminum, Reactive ion etching, Absorption

Read Abstract

PROCEEDINGS ARTICLE | April 25, 2012

Tailoring the absorption in a photonic crystal membrane: a modal approach

Proc. SPIE. 8425, Photonic Crystal Materials and Devices X

KEYWORDS: Amorphous silicon, Photovoltaics, Refractive index, Finite-difference time-domain method, Sensors, Solar cells, Reflectivity, Photonic crystals, Mass attenuation coefficient, Absorption

Read Abstract

PROCEEDINGS ARTICLE | April 25, 2012

Dual-wavelength laser for THz generation by photo-mixing

Proc. SPIE. 8425, Photonic Crystal Materials and Devices X

KEYWORDS: Reflectors, Mirrors, Quantum wells, Resonators, Silica, Luminescence, Reflectivity, Photonic crystals, Semiconductor lasers, Terahertz radiation

Read Abstract

PROCEEDINGS ARTICLE | December 17, 2011

Design and fabrication of photonic crystals in epitaxial-free silicon for ultrathin solar cells

Proc. SPIE. 8312, Display, Solid-State Lighting, Photovoltaics, and Optoelectronics in Energy III

KEYWORDS: Lithography, Holography, Optical lithography, Etching, Solar cells, Silicon, Photonic crystals, Thin film solar cells, Reactive ion etching, Absorption

Read Abstract

PROCEEDINGS ARTICLE | November 28, 2011

Hybrid III-V/Si active microcavities based on photonic crystals

Proc. SPIE. 8308, Optoelectronic Materials and Devices VI

KEYWORDS: Reflectors, Mirrors, Silicon, Photonic crystals, Optical engineering, Vertical cavity surface emitting lasers, Geometrical optics, Pulsed laser operation, Optical microcavities, Hybrid silicon lasers

Read Abstract

PROCEEDINGS ARTICLE | March 1, 2011

Surface emitting laser based on random photonic crystals

Proc. SPIE. 7946, Photonic and Phononic Properties of Engineered Nanostructures

KEYWORDS: Finite-difference time-domain method, Scattering, Photons, Light scattering, Photonic crystals, Multiple scattering, Near field scanning optical microscopy, Near field, Laser crystals, Near field optics

Read Abstract

PROCEEDINGS ARTICLE | June 5, 2010

Multi-resonant microresonators for optical frequency conversion

Proc. SPIE. 7728, Nonlinear Optics and Applications IV

KEYWORDS: Reflectors, Mirrors, Microresonators, Quantum wells, Silica, Photons, Photonic crystals, Nonlinear optics, Terahertz radiation, Optical microcavities

Read Abstract

SPIE Conference Volume | May 24, 2010

Photonic Crystal Materials and Devices IX

PROCEEDINGS ARTICLE | May 18, 2010

Design and fabrication of photonic crystal thin film photovoltaic cells

Proc. SPIE. 7725, Photonics for Solar Energy Systems III

KEYWORDS: Amorphous silicon, Thin films, Optical lithography, Electrodes, Solar cells, Silver, Photonic crystals, Thin film solar cells, Zinc oxide, Absorption

Read Abstract

PROCEEDINGS ARTICLE | May 14, 2010

Absorbing photonic crystals for thin film photovoltaics

Proc. SPIE. 7713, Photonic Crystal Materials and Devices IX

KEYWORDS: Amorphous silicon, Photovoltaics, Holography, Optical lithography, Polarization, Glasses, Solar cells, Photonic crystals, Thin film solar cells, Absorption

Read Abstract

PROCEEDINGS ARTICLE | August 20, 2009

Photonic band-engineering absorption enhancement of amorphous silicon for solar cells

Proc. SPIE. 7411, Nanoscale Photonic and Cell Technologies for Photovoltaics II

KEYWORDS: Amorphous silicon, Photovoltaics, Optical lithography, Polarization, Glasses, Solar cells, Reflectivity, Photonic crystals, Transparent conductors, Absorption

Read Abstract

PROCEEDINGS ARTICLE | November 18, 2008

Compact optical modulator based on carrier induced gain of an InP/InGaAsP micro-disk cavity integrated on SOI

Proc. SPIE. 7135, Optoelectronic Materials and Devices III

KEYWORDS: Thermal optics, Modulation, Waveguides, Silicon, Modulators, Picosecond phenomena, Optical modulators, Electro optics, Electrooptic modulators, Absorption

Read Abstract

PROCEEDINGS ARTICLE | May 6, 2008

Control of mode volume and radiation dynamics of a slow-light-mode in a quasi-3D photonic crystal configuration

Proc. SPIE. 6989, Photonic Crystal Materials and Devices VIII

KEYWORDS: Reflectors, Mirrors, Finite-difference time-domain method, Modulation, Resonators, Polarization, Silicon, Reflectivity, Photonic crystals, Heterojunctions

Read Abstract

PROCEEDINGS ARTICLE | May 5, 2008

Photonic crystal assisted ultra-thin silicon photovoltaic solar cell

Proc. SPIE. 7002, Photonics for Solar Energy Systems II

KEYWORDS: Amorphous silicon, Slow light, Optical lithography, Solar cells, Photons, Silicon, Reflectivity, Photonic crystals, Silicon solar cells, Absorption

Read Abstract

PROCEEDINGS ARTICLE | February 26, 2008

Electrically injected InP microdisk lasers integrated with nanophotonic SOI circuits

Proc. SPIE. 6898, Silicon Photonics III

KEYWORDS: Continuous wave operation, Waveguides, Silicon, Doping, Laser damage threshold, Nanophotonics, Pulsed laser operation, Performance modeling, Laser bonding, Absorption

Read Abstract

PROCEEDINGS ARTICLE | April 18, 2006

Compact photonic devices based on 1D and 2D photonic crystal broadband reflectors

Proc. SPIE. 6182, Photonic Crystal Materials and Devices III (i.e. V)

KEYWORDS: Reflectors, Mirrors, Waveguides, Polarization, Photons, Reflectivity, Photonic crystals, Microopto electromechanical systems, Waveguide modes, Electronic filtering

Read Abstract

PROCEEDINGS ARTICLE | March 1, 2006

Integration issues of a photonic layer on top of a CMOS circuit

Proc. SPIE. 6125, Silicon Photonics

KEYWORDS: Wafer-level optics, Photodetectors, Silica, Waveguides, Germanium, Silicon, Integrated optics, CMOS technology, Semiconducting wafers, Wafer bonding

Read Abstract

PROCEEDINGS ARTICLE | April 13, 2005

Silicon-on-insulator based quasi 3D photonic crystal structures

Proc. SPIE. 5733, Photonic Crystal Materials and Devices III

KEYWORDS: Oxides, Reflectors, Silica, Luminescence, Silicon, Photonic crystals, Scanning electron microscopy, Solids, Distributed Bragg reflectors, Optical microcavities

Read Abstract

PROCEEDINGS ARTICLE | September 15, 2004

Surface operating photonic devices based on 2D photonic crystal: toward 2.5 dimensional microphotonics

Proc. SPIE. 5450, Photonic Crystal Materials and Nanostructures

KEYWORDS: Semiconductors, Reflectors, Photonic devices, Photons, Reflectivity, Photonic crystals, Microopto electromechanical systems, Free space optics, Integrated optics, Reactive ion etching

Read Abstract

PROCEEDINGS ARTICLE | September 15, 2004

Multifunction operation in two-dimensional semiconductor photonic crystal slabs

Proc. SPIE. 5450, Photonic Crystal Materials and Nanostructures

KEYWORDS: Semiconductors, Refractive index, Switching, Resonators, Reflectivity, Photonic crystals, Nonlinear optics, Picosecond phenomena, Nonlinear response, Absorption

Read Abstract

PROCEEDINGS ARTICLE | September 15, 2004

Silicon-on-insulator photonic bandgap structures for future microphotonic devices

Proc. SPIE. 5450, Photonic Crystal Materials and Nanostructures

KEYWORDS: Mirrors, Luminescence, Photons, Crystals, Silicon, Reflectivity, Photonic crystals, Silicon photonics, Semiconducting wafers, Optical microcavities

Read Abstract

PROCEEDINGS ARTICLE | December 29, 2003

Two-dimensional photonic crystal microlasers

Proc. SPIE. 5184, Physics, Theory, and Applications of Periodic Structures in Optics II

KEYWORDS: Silica, Dispersion, Photons, Silicon, Laser applications, Photonic crystals, Semiconductor lasers, Semiconducting wafers, Heterojunctions, Wafer bonding

Read Abstract

PROCEEDINGS ARTICLE | March 11, 2003

InP-membrane photonic devices

Proc. SPIE. 4947, Laser Diodes, Optoelectronic Devices, and Heterogenous Integration

KEYWORDS: Semiconductors, Photonic devices, Optical filters, Dispersion, Photons, Silicon, Photonic crystals, Microopto electromechanical systems, Free space optics, Heterojunctions

Read Abstract

PROCEEDINGS ARTICLE | March 26, 1999

CAD models for optical integrated circuits using the radiation spectrum method (RSM) with evanescent modes

Proc. SPIE. 3620, Integrated Optics Devices III

KEYWORDS: Optical filters, Refractive index, Waveguides, Integrated modeling, Wave propagation, Integrated optics, Computer aided design, Device simulation, Solid modeling, Integrated optical circuits

Read Abstract

PROCEEDINGS ARTICLE | March 10, 1999

Fabrication of multi-air gap InP-based microstructures for widely tunable optical filters

Proc. SPIE. 3680, Design, Test, and Microfabrication of MEMS and MOEMS

KEYWORDS: Reflectors, Optical filters, Mirrors, Fabry–Perot interferometers, Etching, Reflectivity, Wavelength division multiplexing, Micromachining, Electronic filtering, Surface micromachining

Read Abstract

PROCEEDINGS ARTICLE | January 12, 1998

Optical integrated structures for the processing of WDM signals

Proc. SPIE. 3278, Integrated Optic Devices II

KEYWORDS: Optical fibers, Optical filters, Extremely high frequency, Resonators, Interferometers, Wavelength division multiplexing, Signal processing, Integrated optics, Microwave radiation, Filtering (signal processing)

Read Abstract

PROCEEDINGS ARTICLE | December 22, 1997

Behavioral modeling approach for optical communication network design

Proc. SPIE. 3290, Optoelectronic Integrated Circuits II

KEYWORDS: Optical design, Wavelength division multiplexing, Optical communications, Microopto electromechanical systems, Optical networks, Computer aided design, Analog electronics, Network architectures, Systems modeling, Device simulation

Read Abstract

PROCEEDINGS ARTICLE | April 11, 1997

Strength of indium phosphide-based microstructures

Proc. SPIE. 3008, Miniaturized Systems with Micro-Optics and Micromechanics II

KEYWORDS: Indium gallium arsenide, Etching, Dry etching, Gallium arsenide, Indium, Silicon, Optoelectronics, Microopto electromechanical systems, Reactive ion etching, Liquids

Read Abstract

PROCEEDINGS ARTICLE | April 11, 1997

InP-based micromechanical tunable and selective photodetector for WDM systems

Proc. SPIE. 3008, Miniaturized Systems with Micro-Optics and Micromechanics II

KEYWORDS: Semiconductors, Reflectors, Photodetectors, Mirrors, Multilayers, Fabry–Perot interferometers, Etching, Reflectivity, Wavelength division multiplexing, Tunable filters

Read Abstract

PROCEEDINGS ARTICLE | April 11, 1997

Optical characterization methods of InP-based micro-opto-electro-mechanical systems

Proc. SPIE. 3008, Miniaturized Systems with Micro-Optics and Micromechanics II

KEYWORDS: Semiconductors, Mirrors, Indium gallium arsenide, Etching, Reflectivity, Telecommunications, Profilometers, Objectives, Microopto electromechanical systems, Bridges

Read Abstract

PROCEEDINGS ARTICLE | April 11, 1997

Exact numerical technique for the analysis of Bragg reflectors in integrated optical filters

Proc. SPIE. 3008, Miniaturized Systems with Micro-Optics and Micromechanics II

KEYWORDS: Reflectors, Optical filters, Waveguides, Dielectrics, Semiconductor materials, Light scattering, Wave propagation, Integrated optics, Testing and analysis, Optical microcavities

Read Abstract