激光阈值
共振(粒子物理)
低语长廊波浪
材料科学
光电子学
金属
Q系数
光学腔
激光器
光学
原子物理学
物理
谐振器
波长
冶金
作者
Reo Takemoto,Nagisa Ishihara,Hiroyuki Kurosawa,Nusrat Jahan,Taku Asano,X. Liu,H. Nakajima,H. Kumano,I. Suemune
摘要
Metallic nanocavities have been actively studied for realizing nanolasers with low threshold. Presence of resonance modes with high cavity Q values is the indication of low internal loss that leads to low threshold lasing. However, cavity Q values observed in metallic nanocavities below lasing threshold remain low at present on the order of 100 to 500. We study the possibility to realize higher resonance Q values with a metallic nanocavity. For probing purpose of cavity modes we propose to employ broad mid-gap-state optical emission of n-type GaAs. With this method we report the observation of a resonance mode with the high Q value of 3800 at room temperature with the metallic nanocavity. The cavity mode is identified as a whispering-gallery mode with finite-element-method simulation.
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