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Proceedings Paper

Optimal coupling to high-Q whispering gallery modes with a sub-wavelength metallic grating coupler
Author(s): Y. Zhou; Bobo Gu; X. Yu; F. Luan
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Paper Abstract

Gold grating patterned on the end facet of an optical fiber is able to excite whispering gallery mode (WGM) in a silica microsphere. With a direct pathway of the metal reflection, the coupled WGM is able to superimpose and create an asymmetric Fano resonance. Since multiple resonances are present – the WGM, grating reflection, and a weak Fabry-Perot resonance along the diameter of the sphere – it is difficult to evaluate the power efficiency directly from the measured spectrum. Using temporal coupled-mode theory, a general model is constructed for the end-fire coupling from a grating to a WGM resonator.

Paper Details

Date Published: 3 March 2015
PDF: 6 pages
Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 934315 (3 March 2015); doi: 10.1117/12.2079102
Show Author Affiliations
Y. Zhou, Nanyang Techonological Univ. (Singapore)
Singapore Institute of Manufacturing Technology (Singapore)
Bobo Gu, Nanyang Technological Univ. (Singapore)
X. Yu, Singapore Institute of Manufacturing Technology (Singapore)
F. Luan, Nanyang Technological Univ. (Singapore)


Published in SPIE Proceedings Vol. 9343:
Laser Resonators, Microresonators, and Beam Control XVII
Alexis V. Kudryashov; Alan H. Paxton; Vladimir S. Ilchenko; Lutz Aschke; Kunihiko Washio, Editor(s)

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