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Gabriel Christmann

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Related publications (33)

Room temperature polariton lasing in a GaN/AlGaN multiple quantum well microcavity

Jean-François Carlin, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann

The authors report room temperature polariton lasing at lambda similar to 345 nm in a hybrid AlInN/AlGaN multiple quantum well microcavity (MQW-MC) containing a GaN/AlGaN MQW active region, i.e., the achievement under nonresonant optical excitation of cohe ...

2008

Nonpolar GaN-based microcavity using AlN/GaN distributed bragg reflector

Denis Martin, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann, Tiankai Zhu

Nonpolar GaN based microcavity (MC) made of a bottom AlN/GaN distributed Bragg reflector (DBR) and a top dielectric SiO2/SiNx DBR has been fabricated on a-plane GaN template. The 13 pair AlN/GaN DBR, centered around 372 nm, exhibits a peak reflectivity of ...

2008

Large vacuum Rabi splitting in a multiple quantum well GaN-based microcavity in the strong-coupling regime

Jean-François Carlin, Pierre Stadelmann, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann, Antonino Francesco Castiglia, Anas Mouti

An AlInN/AlGaN microcavity (MC) containing a GaN/Al0.2Ga0.8N multiple quantum well (MQW) structure is investigated through room temperature (RT) photoluminescence and reflectivity experiments. A vacuum Rabi splitting as large as 50 meV at RT is reported fo ...

2008

Current status of AlInN layers lattice-matched to GaN for photonics and electronics

Jean-François Carlin, Marcel Py, Julien Dorsaz, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Sylvain Nicolay, Mauro Mosca, Dobri Simeonov, Gabriel Christmann, Antonino Francesco Castiglia, Marcus Gonschorek

We report on the current properties of Al1-x InxN (x approximate to 0.18) layers lattice- matched ( LM) to GaN and their specific use to realize nearly strain- free structures for photonic and electronic applications. Following a literature survey of the g ...

2007

Room-temperature polariton lasing in semiconductor microcavities

Jean-François Carlin, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann

We observe a room-temperature low-threshold transition to a coherent polariton state in bulk GaN microcavities in the strong-coupling regime. Nonresonant pulsed optical pumping produces rapid thermalization and yields a clear emission threshold of 1 mW, co ...

2007

Blue lasing at room temperature in an optically pumped lattice-matched AlInN/GaN VCSEL structure

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

Laser action with low threshold average pump power density (similar to 50 W. cm(-2)) at room temperature is reported for a crack-free planar vertical cavity surface emitting laser (VCSEL) structure based on a bottom lattice-matched AllnN/GaN distributed Br ...

2007

Room-temperature polariton luminescence from a bulk GaN microcavity

Jean-François Carlin, Marc Ilegems, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Mauro Mosca, Gabriel Christmann

We report strong exciton-photon coupling at room temperature in a hybrid high quality bulk 3 lambda/2 GaN cavity with a bottom lattice-matched AlInN/AlGaN distributed Bragg reflector through angle-resolved polarized photoluminescence (PL). Coupling of the ...

2006

Impact of disorder on high quality factor III-V nitride microcavities

Jean-François Carlin, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Dobri Simeonov, Gabriel Christmann

The authors report on the micron scale characterization of a monolithic GaN microcavity (MC) with lattice matched AlInN/GaN distributed Bragg reflectors by means of a microtransmission setup. This technique allows extracting very high quality factors (Q up ...

2006

Crack-free highly reflective AlInN/AlGaN bragg mirrors for UV applications

Jean-François Carlin, Marc Ilegems, Julien Dorsaz, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann

We report the growth of highly reflective distributed Bragg reflectors (DBRs) in the UV region using the Al0.85In0.15N/Al0.2Ga0.8N lattice-matched system. The DBRs were deposited on nearly strain-free Al0.2Ga0.8N templates to avoid strain-induced structura ...

2006

Impact of inhomogeneous excitonic broadening on the strong exciton-photon coupling in quantum well nitride microcavities

Jean-François Carlin, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann

GaN/AlGaN and InGaN/GaN quantum wells (QWs) are investigated as the active region for room-temperature strong exciton-photon coupling in high-quality AlInN/(Al)GaN microcavities (MCs). Angular resolved photoluminescence (PL) measurements performed on an Al ...

2006

Room temperature polariton luminescence from a GaN/AlGaN quantum well microcavity

Jean-François Carlin, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Mauro Mosca, Gabriel Christmann

The authors report on the demonstration of strong light-matter coupling at room temperature using a crack-free UV microcavity containing GaN/AlGaN quantum wells (QWs). Lattice-matched AlInN/AlGaN distributed Bragg reflectors (DBRs) with a maximum peak refl ...

2006

Recent progress in the growth of highly reflective nitride-based distributed Bragg reflectors and their use in microcavities

Jean-François Carlin, Marc Ilegems, Julien Dorsaz, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Gabriel Christmann

The growth of highly-reflective nitride-based distributed Bragg reflectors (DBRs) and their use in vertical cavity structures is reviewed. We discuss the various nitride material systems employed to design Bragg mirrors and microcavities, namely the Al-x(G ...

2005

Progresses in III-nitride distributed Bragg reflectors and microcavities using AlInN/GaN materials

Jean-François Carlin, Julien Dorsaz, Nicolas Grandjean, Raphaël Butté, Eric Feltin, Sylvain Nicolay, Gabriel Christmann

We propose to use lattice-matched AlInN/GaN to replace the Al(Ga)N/GaN material system for III-nitride Bragg reflectors, despite the poor material quality of AlInN reported until very recently. We report an improvement of AlInN material that allowed for su ...

2005

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