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Cylindrical Resonator Utilizing a Curved Resonant Grating as a Cavity Wall

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Author(s): Yasuo Ohtera | Shohei Iijima | Hirohito Yamada

Journal: Micromachines
ISSN 2072-666X

Volume: 3;
Issue: 1;
Start page: 101;
Date: 2012;
Original page

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

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.
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Tango Jona
Tangokurs Rapperswil-Jona