Blue light-emitting diodes based on III-nitride semiconductors are nowadays widely used for solid-state lighting. They exhibit impressive figures of merit like an internal quantum efficiency close to 100%. This value is intriguing when considering the high ...

2018

Efficient continuous-wave nonlinear frequency conversion in high-Q gallium nitride photonic crystal cavities on silicon

Nicolas Grandjean, Romuald Houdré, Jean-François Carlin, Vincenzo Savona, Matteo Galli, Momchil Minkov, Mohamed Sabry Abdel-Aliem Mohamed

We report on nonlinear frequency conversion from the telecom range via second harmonic generation (SHG) and third harmonic generation (THG) in suspended gallium nitride slab photonic crystal (PhC) cavities on silicon, under continuous-wave resonant excitat ...

2017

Quantification of scattering loss of III-nitride photonic crystal cavities in the blue spectral range

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Ian Michael Rousseau, Irene Sánchez Arribas, Kanako Shojiki

The mechanisms contributing to experimental quality factors of shortwavelength (lambda = 440-480 nm) III-nitride on silicon one-dimensional photonic crystal cavities were quantified. Fluctuations in fundamental and first-order cavity mode wavelength and qu ...

Amer Physical Soc2017

Burying non-radiative defects in InGaN underlayer to increase InGaN/GaN quantum well efficiency

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Denis Martin, Gwénolé Jean Jacopin, Camille Haller

The insertion of an InGaN underlayer (UL) is known to strongly improve the performance of InGaN/GaN quantum well (QW) based blue light emitting diodes (LEDs). However, the actual physical mechanism responsible for it is still unclear. We thus conduct a sys ...

American Institute of Physics2017

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Optical absorption edge broadening in thick InGaN layers: Random alloy atomic disorder and growth mode induced fluctuations

Nicolas Grandjean, Jean-François Carlin, Raphaël Butté, Georg Rossbach, Marlene Glauser, Gordon Jens Callsen, Lise Lahourcade

AIP American Institute of Physics2018