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Micro-fabrication augmented whispering gallery mode resonators open up new possibilities January 16th, 2013

We apply focused ion beam (FIB) methods to precisely engrave a surface grating directly into the perimeter of a crystalline disc. The grating provides a simple and highly directional free-space coupling mechanism with superior stability to evanescent coupling techniques. These embedded gratings can also provide control of the resonance spectrum, significantly reducing the mode density. Other augmentations and applications are possible. The research results are reported in the forthcoming issue of Optics Letters