Open AccessDeep subwavelength plasmonic whispering-gallery-mode cavity
Author(s) -
Soon-Hong Kwon
Publication year - 2012
Publication title -
optics express
Language(s) - Uncategorized
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.20.024918
Subject(s) - whispering gallery wave , optics , materials science , plasmon , mode volume , surface plasmon polariton , q factor , wavelength , surface plasmon , radius , dielectric , optoelectronics , resonator , physics , optical fiber , fiber optic sensor , computer security , computer science , graded index fiber
We propose a plasmonic whispering-gallery-mode cavity comprising of a dielectric disk with sub-hundred nanometer thickness sandwiched by two silver disks. By reducing radius and thickness carefully based on the investigated resonant wavelength dependencies, the surface-plasmon-polariton cavity mode with a resonant wavelength of 1550 nm can be confined in a disk with a radius of 88 nm and a thickness of 10 nm, where the physical size of the cavity is 0.000064 λ(0) <(3) (λ(0): free space wavelength). The cavity mode has a deep subwavelength mode volume of 0.010 (λ/2n)(3) and a high quality factor of 1900 at 40K, consequently, a large Purcell factor of 1.1 x 10(5).