MIOMD-XI Speakers    
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1.  Dr. Gangyi Xu, Institut d'Électronique Fondamentale, FRANCE
Invited Talk: High power extraction in surface-emitting terahertz quantum cascade lasers using type-II photonic heterostructures
Speaker Biography: Gangyi Xu was born in Zhejiang, China in 1974. He received the Ph.D. degree in Physics from the Lanzhou University, Lanzhou, China in 2000. He presently works at Institut d’Electronique Fondamentale in France. His research interests include mid- and far-infrared semiconductor lasers and photodetectors, photonic crystals, plasmonics, and metamaterials.

Summary: We report high-power, single-mode surface-emission from THz quantum cascade (QC) lasers with a type-II photonic heterostructure (PHS) resonator. Such resonator selectively excites the unusual radiative mode with significantly enhanced radiation efficiency. The PHS lasers (f ~ 3.4 THz) exhibit record-high single-mode peak output powers, as well as directional single-lobed beam patterns. PHS surface-emitting lasers exhibit high external quantum efficiency (230 mW/A), which is more than 10 times higher than their DFB counterparts at the same wavelength (3.4 THz). A record-high single-mode peak output power of 103 mW is achieved at 20 K. A direction single-lobed far-field beam pattern is also realized, which addresses another important issue of THz QC laser: the beam divergence. Lithographically tunable single mode surface emission is demonstrated. Recent results on continuous wave operation of PHS lasers will also be shown.
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