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Lasers à cascade quantique et leurs applications aux cristaux photoniques

Abstract : This thesis work is focused on quantum cascade lasers with surface plasmons waveguides, operating in the mid-IR range of the electromagnetic spectrum, and their applications to photonic crystals in the mid-IR and THz. For long wavelengths (λ> 10 μm) light is confined within the laser active region by a metallic layer on the device top surface. These waveguides are known as “surface plasmons waveguides”. Their reduced thickness is advantageous for the implementation of photonic crystal or DFB (Distributed Feedback) devices. The manuscript presents a comprehensive study of these waveguides. It demonstrates - experimentally and theoretically - that it is possible to improve the performance surface-plasmon quantum cascade lasers by using silver instead of gold as surface-plasmon-carrying layer. In addition, an original method for gain and loss measurement based on multi-section resonators has been employed to carefully study surface-plasmon devices. The second part of this manuscript is devoted to a theoretical study of the honeycomb lattice in view of the fabrication of microcavity lasers for the mid-IR and THz ranges of the electromagnetic spectrum. This study has been realized via two-dimensional simulations using the plane wave expansion method, and also in three dimensions within a FDTD (Finite-Difference Time-Domain) approach. Thanks to this study, a new phenomenon has been elucidated: metal-metal waveguides operating in the THz range offer the possibility to implement a photonic crystal by the sole metal patterning on the top device surface, without using a deep semiconductor etch.
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https://tel.archives-ouvertes.fr/tel-00285503
Contributor : Michaël Bahriz <>
Submitted on : Thursday, June 5, 2008 - 4:15:11 PM
Last modification on : Wednesday, October 14, 2020 - 3:57:07 AM
Long-term archiving on: : Friday, May 28, 2010 - 9:16:17 PM

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  • HAL Id : tel-00285503, version 1

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Michaël Bahriz. Lasers à cascade quantique et leurs applications aux cristaux photoniques. Physique Atomique [physics.atom-ph]. Université Paris Sud - Paris XI, 2008. Français. ⟨tel-00285503⟩

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