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Perpendicular coupler for whispering-gallery resonators |
Optics Letters, Vol. 37, Issue 15, pp. 3123-3125 (2012)
http://dx.doi.org/10.1364/OL.37.003123
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Abstract
In this Letter, we report on a perpendicular coupler (PC) for whispering-gallery resonators; it is a near field waveguide optimized for high coupling efficiency. The PC provides highly efficient tunneling coupling between the waveguide and microresonator without the need of a phase matching condition, and saves space for integration components. Compared to the Lorentz-shape in the transmission spectrum of the parallel coupler, the reflection spectrum of the PC shows an asymmetric Fano-shape near resonance. Furthermore, we demonstrate that the collection efficiency can be enhanced by near field scatterers, with a maximal efficiency of about 75%. Our simulations show that the PC is not sensitive to most parameters (including the refractive index of the waveguide), which makes the PC optimal for the application of whispering-gallery modes.
© 2012 Optical Society of America
OCIS Codes
(130.1750) Integrated optics : Components
(140.5560) Lasers and laser optics : Pumping
(230.4555) Optical devices : Coupled resonators
ToC Category:
Optical Devices
History
Original Manuscript: May 3, 2012
Revised Manuscript: June 13, 2012
Manuscript Accepted: June 13, 2012
Published: July 20, 2012
Citation
Fang-Jie Shu, Chang-Ling Zou, and Fang-Wen Sun, "Perpendicular coupler for whispering-gallery resonators," Opt. Lett. 37, 3123-3125 (2012)
http://www.opticsinfobase.org/ol/abstract.cfm?URI=ol-37-15-3123
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