Publications by Gatien Cosendey

Analysis of structurally sensitive loss in GaN-based VCSEL cavities and its effect on modal discrimination

Gatien Cosendey, Nicolas Grandjean, Ehsan Hashemi

Lateral loss causes optical energy to leave the laser cavity in the transverse, lateral, direction, and is sometimes neglected to simplify the numerical simulations. However, in contrast to outcoupling and absorption losses, we show that the lateral loss c ...

Optical Soc Amer2014

Intrinsic degradation mechanism of nearly lattice-matched InAlN layers grown on GaN substrates

Jean-François Carlin, Gatien Cosendey, Nicolas Grandjean, Raphaël Butté

Thanks to its high refractive index contrast, band gap, and polarization mismatch compared to GaN, In0.17Al0.83N layers lattice-matched to GaN are an attractive solution for applications such as distributed Bragg reflectors, ultraviolet light-emitting diod ...

Amer Inst Physics2013

Q-factor of (In,Ga)N containing III-nitride microcavity grown by multiple deposition techniques

Jean-François Carlin, Gatien Cosendey, Jacques Levrat, Nicolas Grandjean, Raphaël Butté, Marlene Glauser, Georg Rossbach

A 3 lambda/2 (In,Ga)N/GaN resonant cavity, designed for similar to 415nm operation, is grown by molecular beam epitaxy and is sandwiched between a 39.5-period (In,Al)N/GaN distributed Bragg reflector (DBR), grown on c-plane GaN-on-sapphire pseudo-substrate ...

Amer Inst Physics2013

(In,Al)N-based blue microcavity lasers

Gatien Cosendey

EPFL2013

Engineering the Lateral Optical Guiding in Gallium Nitride-Based Vertical-Cavity Surface-Emitting Laser Cavities to Reach the Lowest Threshold Gain

Gatien Cosendey, Nicolas Grandjean, Ehsan Hashemi

In order to improve the current injection in GaN-based blue vertical-cavity surface-emitting lasers (VCSELs) a dielectric aperture is generally used in combination with an indium-tin-oxide (ITO) layer on the top intracavity p-contact layer. The most straig ...

Iop Publishing Ltd2013

Blue monolithic AlInN-based vertical cavity surface emitting laser diode on free-standing GaN substrate

Jean-François Carlin, Gatien Cosendey, Nicolas Grandjean, Antonino Francesco Castiglia, Georg Rossbach

We report on III-nitride based blue vertical cavity surface emitting lasers using defect-free highly reflective AlInN/GaN distributed Bragg reflectors grown on c-plane free-standing GaN substrates. Lasing is demonstrated at room temperature under pulsed el ...

American Institute of Physics2012

Nonlinear emission properties of an optically anisotropic GaN-based microcavity

Gatien Cosendey, Jacques Levrat, Nicolas Grandjean, Raphaël Butté, Marlene Glauser, Georg Rossbach, Munise Nevin Cobet

The pronounced optical in-plane anisotropy of a suitably designed nonpolar GaN-based microcavity, mainly inherited from the valence-band complexity of wurtzite semiconductors, allows the coexistence of two different light-matter coupling regimes along orth ...

Amer Physical Soc2012

Strain compensation in AlInN/GaN multilayers on GaN substrates: Application to the realization of defect-free Bragg reflectors

Jean-François Carlin, Gatien Cosendey, Nicolas Grandjean, Raphaël Butté, Nils Asmus Kristian Kaufmann

We report on the growth conditions of AlInN layers grown on free-standing GaN substrates. We found that an average indium content of similar to 20% is needed to obtain defect-free AlInN/GaN multilayers. This is larger than the commonly accepted value of 18 ...

AIP American Institute of Physics2011

Tailoring the light-matter coupling in anisotropic microcavities: Redistribution of oscillator strength in strained m-plane GaN/AlGaN quantum wells

Gatien Cosendey, Jacques Levrat, Nicolas Grandjean, Raphaël Butté, Marlene Glauser, Georg Rossbach, Munise Nevin Cobet

We present a comprehensive study of the anisotropic optical properties of nonpolar GaN/AlGaN multiple quantum wells intentionally designed to act as an active region of a planar microcavity operating in the strong-coupling regime. The strain induced by the ...

2011

High Power Blue-Violet Superluminescent Light Emitting Diodes with InGaN Quantum Wells

Jean-François Carlin, Julien Dorsaz, Gatien Cosendey, Nicolas Grandjean, Marco Rossetti, Eric Feltin, Antonino Francesco Castiglia

We report on the characteristics of blue superluminescent light emitting diodes based on the emission of InGaN quantum wells. Narrow ridge-waveguide devices realized by standard processing techniques and with extremely low facet reflectivity show single la ...

2010

Emission characteristics of GaN-based blue lasers including a lattice matched Al0.83In0.17N optical blocking layer for improved optical beam quality

Jean-François Carlin, Julien Dorsaz, Gatien Cosendey, Nicolas Grandjean, Eric Feltin, Antonino Francesco Castiglia

We demonstrate room-temperature continuous-wave operation of 425 nm InGaN-based blue laser diodes including a thin Al0.83In0.17N optical blocking layer. Structures are grown on c-plane GaN freestanding substrates with a lattice-matched AlInN layer position ...

AIP American Institute of Physics2010

AlGaN-Free Blue III-Nitride Laser Diodes Grown on c-Plane GaN Substrates

Jean-François Carlin, Julien Dorsaz, Gatien Cosendey, Nicolas Grandjean, Marco Rossetti, Eric Feltin, Antonino Francesco Castiglia

We report on the fabrication of InGaN-based multiple-quantum-well laser diodes (LDs) emitting at 420 nm. Structures with standard claddings (p-and n-AlGaN), asymmetric claddings (p-GaN and n-AlGaN), and AlGaN-free claddings were grown by metal organic vapo ...

2010

Towards room temperature electrically pumped blue vertical cavity surface emitting lasers

Jean-François Carlin, Alexei Altoukhov, Gatien Cosendey, Jacques Levrat, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann, Antonino Francesco Castiglia

The authors report on strategies to achieve lasing in electrically driven vertical cavity surface emitting lasers at room temperature, namely the improvement of the quality factor of a microcavity suited for electrical injection, the use of a ZnO contact t ...

Ieee2009

Broadband blue superluminescent light-emitting diodes based on GaN

Jean-François Carlin, Julien Dorsaz, Gatien Cosendey, Nicolas Grandjean, Eric Feltin, Antonino Francesco Castiglia, Luca Alex Milo Sulmoni

We report on the achievement of III-nitride blue superluminescent light-emitting diodes on GaN substrates. The epitaxial structure includes an active region made of In0.12Ga0.88N quantum wells in a GaN/AlGaN waveguide. Superluminescence under cw operation ...

2009

Al0.83In0.17N lattice-matched to GaN used as an optical blocking layer in GaN-based edge emitting lasers

Jean-François Carlin, Alexei Altoukhov, Gatien Cosendey, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Antonino Francesco Castiglia

Nitride-based blue laser diode structures with either Al0.83In0.17N/Al0.07Ga0.93N or Al0.87In0.13N bottom claddings have been fabricated and compared to standard structures including solely Al0.07Ga0.93N bottom claddings. Lasing emission at 415 nm is achie ...

2009

GaN-based laser diodes including a lattice-matched Al0.83In0.17N cladding layer

Jean-François Carlin, Gatien Cosendey, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Antonino Francesco Castiglia

Nitride blue lasers including an AlInN cladding lattice matched to GaN were fabricated. Lasing at 415nm is observed at 300K with a threshold current density of 7.5kA/cm(2) and a peak power of 140mW at 1.2A. (C) 2009 Optical Society of America ...

Ieee2009

Blue laser diodes including lattice-matched Al0.83In0.17N bottom cladding layer

Jean-François Carlin, Julien Dorsaz, Gatien Cosendey, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Antonino Francesco Castiglia

A report is presented on InGaN/GaN multiple quantum well laser diodes, grown by metal organic vapour phase epitaxy on c-plane sapphire substrates, including an Al0.83In0.17N cladding layer lattice-matched to GaN. Lasing action is demonstrated for gain-guid ...

2008