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Q factor improvement by capsule‐shaped metallic cavity structure for subwavelength lasers
Author(s) -
Zhang Baifu,
Chieda Koh,
Okimoto Takuya,
Tanemura Takuo,
Nakano Yoshiaki
Publication year - 2016
Publication title -
physica status solidi (a)
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.532
H-Index - 104
eISSN - 1862-6319
pISSN - 1862-6300
DOI - 10.1002/pssa.201532561
Subject(s) - materials science , curvature , electric field , optoelectronics , capsule , laser , optics , wavelength , quantum well , photoluminescence , plasmon , q factor , physics , geometry , resonator , mathematics , botany , quantum mechanics , biology
A series of wavelength‐scale capsule‐shaped metallic cavity structures with InGaAs/InGaAsP multiple quantum wells are fabricated and characterized by photoluminescence measurement for the first time. By introducing cylindrical facets with optimal curvature to a conventional rectangular cavity, the electric field of the resonant mode is pushed effectively into the center of the mesa. As a result, the mode distribution at the metallic sidewalls and the plasmonic losses are reduced dramatically. We experimentally confirm up to fourfold enhancement in the Q factor of the fabricated capsule‐shaped cavity compared with that of a rectangular structure with same dimension. The measured results are consistent with the 3D finite‐difference time‐domain simulation, and validate the effectiveness of the scheme.