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http://dx.doi.org/10.3807/KJOP.2018.29.3.104

Anisotropic Whispering Gallery Modes Formed in Various Transformation Cavities  

Kim, Inbo (Digital Technology Research Institute, Kyungpook National University)
Choi, Muhan (Digital Technology Research Institute, Kyungpook National University)
Publication Information
Korean Journal of Optics and Photonics / v.29, no.3, 2018 , pp. 104-109 More about this Journal
Abstract
We explain the basic principle of transformation optics, and introduce several design techniques for transformation cavities that can maintain the characteristics of whispering gallery modes (WGMs) even if the cavity is strongly deformed from a circular shape. As a method of obtaining various transformation cavities under a specific conformal mapping, we suggest a method of parallel movement of the initial cavity domain, and a method of rotating the ellipse as a cavity domain. The internal wave pattern and the far-field output characteristics of several designed resonant modes are numerically calculated. From these results, it is confirmed that a variety of GRIN resonators are possible for a given conformal coordinate transformation.
Keywords
Transformation optics; GRIN devices; Whispering gallery mode (WGM); Asymmetric resonant cavity (ARC);
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