High-Q resonance modes observed in a metallic nanocavity
High-Q resonance modes observed in a metallic nanocavity
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DOI：
10.1063/1.4828351
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发表时间：
2013-11
影响因子：
4
通讯作者：
R. Takemoto;N. Ishihara;H. Kurosawa;N. A. Jahan;T. Asano;X. Liu;H. Nakajima;H. Kumano;I. Suemune
中科院分区：
文献类型：
--
作者：
R. Takemoto;N. Ishihara;H. Kurosawa;N. A. Jahan;T. Asano;X. Liu;H. Nakajima;H. Kumano;I. Suemune
为了实现低阈值的纳米激光器，金属纳米腔已经被积极地研究。具有高腔Q值的谐振模式的存在是导致低阈值激光的低内部损耗的指示。然而，在低于激光阈值的金属纳米腔中观察到的腔Q值目前仍然很低，大约为100至500。我们研究了用金属纳米腔实现更高谐振Q值的可能性。为了探测腔模，我们建议采用n型GaAs的宽中间带隙态光发射。利用这种方法，我们报道了在室温下用金属纳米腔观察到一个高Q值为3800的谐振模。通过有限元模拟，确定了腔模为回音壁模。
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.