Trends in Nano- and Micro-Cavities

Theoretical and experimental characterization of double-disk whispering-gallery microcavities

Author(s): Jee Soo Chang, Shinyoung Lee, Seung Hoon Lee, Jong-Bum You, Jung H. Shin and Bumki Min

Pp: 252-266 (15)

Doi: 10.2174/978160805236311101010252

* (Excluding Mailing and Handling)

Abstract

Double-disk resonators, composed of two nearly-identical dielectric disks separated by nanoscale air gap, can be configured to exhibit small modal volumes with high-Q factors. Compared to the two fundamental eigenmodes of a single-disk resonator (TE and TM), those supported by the double-disk microcavity are split into four modes, which can be categorized as symmetric and antisymmetric modes: TEs/TEas and TMs/TMas, depending on the field symmetry. Theoretical descriptions on these eigenmodes are given with regard to the cavity performance metrics such as cavity mode dispersion, Q-factor, and mode index. Experimental verification of these eigenmodes is provided for a 40-nm gap double-disk/air-slot resonator. In addition to these optical mode characterizations, the mechanical eigenmodes of double-disk structures, which can be actuated by the optical gradient forces, are investigated.

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