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We present experimental characterizations of 1D crossed Guided Mode Resonant Filters (GMRFs) in the near infrared fabricated by nanoimprint lithography. We will show that subwavelength gratings up to 4″ diameter can be fabricated using such techniques. We compare the performances of the GMRFs to the performances of Fabry-Perot filters and discuss the sensitivity to fabrication inhomogeneity of these...
Due to its independency to the substrate used, Soft mold NanoImprint Lithography (S-NIL) is a technique of great interest in particular for the fabrication of optical devices. We demonstrate a mature pathway for the realization of optical filters from the conception to the optical characterization. Those filters can be realized on large surfaces (up to 6″ diameter wafers) with high conformity on various...
Electrically-pumped all-photonic-crystal lasers are reported on GaSb materials. Lasers show single-mode emission around 2.4 μm with more than 35 dB of SMSR over a wide range of currents.
Graded CRIGF filters were fabricated and characterized. When inserted in a three elements cat's eyes laser diode external cavity, they allow continuous tuning of the emission wavelength over 20 nm in the 850 nm range.
We report on the design, fabrication and characterization of all-photonic-crystal, electrically-pumped, second-order DFB lasers arrays emitting around 2.4 µm. Lasers were fabricated using GaSb-based materials and optimized 2D photonic crystal waveguides geometry. Threshold in the range of 100–150 mA depending on the PhC period are measured. CW emission with high SMSRs of 35 dB are achieved. Such laser...
In this contribution we present the preliminary results of the experimental characterisation of Mesoscopic Photonic Crystal membrane-based microcavities. Thanks to the Mesoscopic Self-Collimation phenomenon, it is possible to achieve a full light confinement for non-paraxial excitation even in all positive-index, right-handed linear material based 1D Fabry-Pérot-like cavities having straight mirrors...
The III–V semiconductor /oxide technology has become the standard fabrication technique for Vertical-Cavity Surface-Emitting Lasers. Current research aims to further enhance the performance of these emitters and diversify the range of devices that can be made using this technology. In this paper, we present a new model of the oxidation process which includes the anisotropic behaviour observed during...
Mesoscopic self-collimation offered by mesoscopic photonic crystals can be efficiently used to control light lateral dispersion in conjunction with controlled reflectivity. An accurate control of this phenomenon is crucial for the exploitation of peculiar effects such as the outwitting of instabilities in planar cavities and the collimation in arbitrary directions inside the mesoscopic photonic crystal.
We present a simple frequency-selective 3-element cat's-eye cavity laser enabled by a new optical element, the so-called Cavity Resonant Integrated Grating Filter (CRIGF). Output powers in excess of 30 mW are achieved with single-mode emission. Discrete tuning around a central wavelength of 850 nm is achieved over a 30 nm band using a semiconductor source with an AR coated output facet. We will discuss...
A new generation of resonant grating filters called Cavity Resonator Integrated Guided Mode Filters (CRIGFs) were recently introduced in [1]. Such reflective filters exhibit high reflectivity with narrow spectral bandwidth even for tightly focused beams [2]. This, combined with their large alignment tolerances make them ideal candidates for use as reflectors in cat's-eye-configuration external-cavity...
Self-collimation is the ability for a structure to propagate a light beam without any distortion and in particular without lateral spreading. Demonstrated in 1999 in photonic crystal structures (PhC) by Kosaka [1], it has since then been at the heart of many theoretical and experimental studies. Recently self-collimation in mesoscopic structures alternating slabs of PhC and slabs of bulk material...
High contrast gratings (HCG) have drained recently highly attractive perspectives for VCSEL devices through the wide potentialities for obtaining unique optical properties with these integrable optical elements [1], in contrast to conventional Bragg reflectors. Since most of the HCG approaches on III-V based photonic devices are based on semiconductor/air-gap structures, strong limitations are foreseen...
Resonant grating filters are new optical components of high interest for optical reinjection in a laser diode as they provide simultaneously high reflectivity and high spectral selectivity. However, their usefulness is limited by a low angular tolerance that requires the use of collimated beams. Following the proposal from Ura et al. [1], we demonstrated small aperture resonant grating filters with...
The first wavelength-stabilised external-cavity laser diode using a new generation of resonant grating filters called the cavity resonator integrated guided mode filter (CRIGF) is reported. The CRIGF combines high reflectivity and spectral selectivity for tightly focused beams allowing the simplified `cat's eye' external cavity to be used. Output powers of more than 10 mW together with a side mode...
GaInAsSb/AlGaAsSb quantum wells lasers have been grown by molecular beam epitaxy and processed into ridge cavities coupled by an intracavity photonic crystal mirror. The lasers operate at room temperature in the continuous wave regime at 2.35 μm. One of these devices was used as an excitation source on a methane sensor based on quartz-enhanced photoacoustic spectroscopy. A spectrophone, consisting...
We demonstrate random lasing emission in a AlGaAs suspended membrane randomly perforated with subwavelength circular holes. Spectrally-resolved imaging of the lasing emission allows identifying lasing modes in the diffusive regime.
We show that by combining an affine deformation and a waveguide deformation, 2D photonic crystal edgeemitting second order DFB lasers can be designed and operated with both extremely high Q's and a high robustness towards optical reinjection from the emission facet.
Many applications -like spectroscopy- require spectral filtering, commonly achieved using Fabry-Pérot stacks. These can be designed to fulfill varying requirements (central wavelength, bandwidth and rejection). However, practical fabrication of the stack imposes some limitations. Indeed, reducing the bandwidth requires an increasing number of layers and ultra-narrowband filters are hard to fabricate...
By harnessing the potential of photonic crystal waveguide, we have developed inherently single-mode DFB lasers that can be integrated in arrays. We propose and demonstrate two methods (affine deformation and double deformation) for fine optimization and control of both the emission wavelength and the mode discrimination of such lasers. Integrated arrays of single-mode DFB lasers on membrane emitting...
Resonant grating filters are promising alternatives to conventional spectral filters for narrowband free-space filtering. The high performances achieved experimentally by such filters in the near infrared have lead to a study of resonant grating filters in the mid infrared. In this paper, we show that GaAs/AlGaAs system is an interesting system for the realization of such filters and that limitations...
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