Cross-sectional shape optimization of whispering-gallery ring resonators

Akihiro Takezawa, Mitsuru Kitamura

Research output: Contribution to journalArticlepeer-review

8 Citations (Scopus)


Optimal cross-sectional shapes of whispering-gallery ring resonators with prescribed emission wavelength and resonance mode are generated using topology optimization based on the finite element method. The two critical performance indices, the quality factor (Q factor) and mode volume of a resonator, are treated as the objective functions in the optimization. In our numerical study, characteristics of optimal configurations are identified and analyzed. Since the Q factor and mode volume have a trade-off relationship, i.e., an increasing Q factor increases mode volume, a Pareto-optimal set of solutions can be identified under certain device specifications. These configurations achieve better performances than existing shapes in producing both a high Q factor and low mode volume.

Original languageEnglish
Article number6235968
Pages (from-to)2776-2782
Number of pages7
JournalJournal of Lightwave Technology
Issue number17
Publication statusPublished - 2012 Sept 1
Externally publishedYes

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics


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