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Subwavelength metallic cavities with high-Q resonance modes

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Title: Subwavelength metallic cavities with high-Q resonance modes
Authors: Ishihara, Nagisa Browse this author
Kurosawa, Hiroyuki Browse this author
Takemoto, Ryo Browse this author
Jahan, Nahid A. Browse this author
Nakajima, Hideaki Browse this author
Kumano, Hidekazu Browse this author →KAKEN DB
Suemune, Ikuo Browse this author →KAKEN DB
Keywords: metallic cavity
Q factor
temperature dependence
whispering gallery mode
Issue Date: 27-Feb-2015
Publisher: IOP Publishing
Journal Title: Nanotechnology
Volume: 26
Issue: 8
Start Page: 85201
Publisher DOI: 10.1088/0957-4484/26/8/085201
PMID: 25648417
Abstract: Metallic cavities have been extensively studied to realize small-volume nanocavities and nanolasers. However cavity-resonance quality (Q) factors of nanolasers observed up to now remain low (up to similar to 500) due to metal optical absorption. In this paper, we report the observation of highest Q factors of 9000 at low temperature and similar to 6000 near room temperature in a metallic cavity with a probe of sub-bandgap emission of Si-doped GaAs. We analyze the temperature dependence of cavity-mode resonance wavelengths and show that the refractive-index term dominates the measured temperature dependence. We also show that this refractive-index term is cavity-mode dependent and the fitting procedure offers a new method to identify cavity modes. We simulate the metallic cavity with finite-element method and attribute the high-Q cavity mode to a whispering gallery optical mode. This mode is shown to have isotropic polarization dependence of the output emission, which is preferable for quantum information applications.
Rights: This is an author-created, un-copyedited version of an article accepted for publication in Nanotechnology. The publisher is not responsible for any errors or omissions in this version of the manuscript or any version derived from it. The Version of Record is available online at
Type: article (author version)
Appears in Collections:電子科学研究所 (Research Institute for Electronic Science) > 雑誌発表論文等 (Peer-reviewed Journal Articles, etc)

Submitter: 末宗 幾夫

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