Subwavelength metallic cavities with high-Q resonance modes

• Ishihara, Nagisa

• Kurosawa, Hiroyuki

• Takemoto, Ryo

• Jahan, Nahid A.

• Nakajima, Hideaki

• Kumano, Hidekazu

• Suemune, Ikuo

Bibliographic Information

Other Title

• Subwavelength metallic cavities with high-<i>Q</i>resonance modes

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.

Journal

• Nanotechnology

  Nanotechnology 26 (8), 85201-, 2015-02-27

  IOP Publishing

Keywords

• metallic cavity
• Q factor
• polarization
• temperature dependence
• whispering gallery mode

Details

• CRID: 1050282813994823552
• NII Article ID: 120005697196
• DOI: 10.1088/0957-4484/26/8/085201
• ISSN: 13616528
• ISSN: 09574484
• HANDLE: 2115/60632
• Web Site: http://stacks.iop.org/0957-4484/26/i=8/a=085201/pdf
• Web Site: http://stacks.iop.org/0957-4484/26/i=8/a=085201?key=crossref.8cd992e8ae48a13cafcfe281fd2fcf02
• Text Lang: en
• Article Type: journal article
• Data Source:
  • IRDB
  • Crossref
  • CiNii Articles
  • KAKEN