Whispering gallery mode resonators augmented with engraved diffraction gratings

被引：24
作者：
Aveline, David C. [1 ]
Baumgartel, Lukas M. [1 ,2 ]
Lin, Guoping [1 ]
Yu, Nan [1 ]
机构：
[1] CALTECH, Jet Prop Lab, Pasadena, CA 91109 USA
[2] Univ So Calif, Los Angeles, CA 90089 USA
来源：
OPTICS LETTERS | 2013年 / 38卷 / 03期
基金：
美国国家航空航天局;
关键词：
CAVITY;
D O I：
10.1364/OL.38.000284
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
We report the demonstration of whispering gallery mode (WGM) resonators augmented with diffraction gratings. 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 integrated gratings can also provide control of the resonance spectrum, significantly reducing the mode density. Our FIB fabrication process does not introduce significant loss; Q similar or equal to 3 x 10(7) has been demonstrated. The wavelength dependence of the diffraction angle was found to be in excellent agreement with grating theory. The versatility of spectral control and far-field grating coupling will have significant impact in WGM resonator applications in lasers, sensors, and optoelectronics. (C) 2013 Optical Society of America
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收藏
页码：284 / 286
页数：3
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