Optimal coupling to high-Q whispering gallery modes with a sub-wavelength metallic grating coupler

Y. Zhou; Bobo Gu; X. Yu; F. Luan

doi:10.1117/12.2079102

3 March 2015 Optimal coupling to high-Q whispering gallery modes with a sub-wavelength metallic grating coupler

Y. Zhou, Bobo Gu, X. Yu, F. Luan

Proceedings Volume 9343, Laser Resonators, Microresonators, and Beam Control XVII; 934315 (2015) https://doi.org/10.1117/12.2079102
Event: SPIE LASE, 2015, San Francisco, California, United States

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.

Citation Download Citation

Y. Zhou, Bobo Gu, X. Yu, and F. Luan "Optimal coupling to high-Q whispering gallery modes with a sub-wavelength metallic grating coupler", Proc. SPIE 9343, Laser Resonators, Microresonators, and Beam Control XVII, 934315 (3 March 2015); https://doi.org/10.1117/12.2079102

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