cylindrical resonator utilizing a curved resonant grating as a cavity wall圆柱形谐振器利用弯曲共振光栅腔壁.pdfVIP

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cylindrical resonator utilizing a curved resonant grating as a cavity wall圆柱形谐振器利用弯曲共振光栅腔壁.pdf

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cylindrical resonator utilizing a curved resonant grating as a cavity wall圆柱形谐振器利用弯曲共振光栅腔壁

Micromachines 2012, 3, 101-113; doi:10.3390/mi3010101 OPEN ACCESS micromachines ISSN 2072-666X /journal/micromachines 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; E-Mails: iijima@ecei.tohoku.ac.jp (S.I.); yamada@ecei.tohoku.ac.jp (H.Y.) * Author to whom correspondence should be addressed; E-Mail: ohtera@ecei.tohoku.ac.jp; Tel./Fax: +81-22-795-7103. Received: 26 December 2011; in revised form: 15 February 2012 / Accepted: 17 February 2012 / Published: 27 February 2012 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 1. Introduction The cylindrical cavity is one of th