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• Iijima, S
• Yamada, H
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• Yamada, H
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• Iijima, S
• Yamada, H

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Micromachines 2012, 3(1), 101-113; doi:10.3390/mi3010101

Article

Cylindrical Resonator Utilizing a Curved Resonant Grating as a Cavity Wall

Yasuo Ohtera* , Shohei Iijima and Hirohito Yamada

Graduate School of Engineering, Tohoku University, Aramaki-Aza-Aoba 6-6, Aoba-ku, Sendai, Miyagi 980-8579, Japan

* Author to whom correspondence should be addressed.

Received: 26 December 2011; in revised form: 15 February 2012 / Accepted: 17 February 2012 / Published: 27 February 2012

(This article belongs to the Special Issue Nano-photonic Devices)

Download PDF Full-Text [1746 KB, uploaded 27 February 2012 16:10 CET]

Abstract: A thin-film grating on a curved substrate functions as a highly reflective and wavelength sensitive mirror for a diverging wave that has the same curvature as the substrate. In this paper we propose a cylindrical cavity surrounded by a curved resonant grating wall, and describe its resonance characteristics. Through finite-difference time-domain (FDTD) simulation we have clarified that this type of cavity supports two resonance modes: one is confined by Fresnel reflection and the other by resonance reflection of the wall. We have also demonstrated that the latter mode exhibits a Q factor several orders of magnitude higher than that of the former mode.

Keywords: resonant grating; guided-mode resonance; cylindrical cavity; circular cavity

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