A new concept enabling the realization of smaller resonators that exhibit higher performance opens the possibility of improved and novel applications.Jacob Scheuer, William M.J. Green and Amnon Yariv, California Institute of TechnologyCircular resonators are key ingredients in the realization of many basic components for advanced optical communications systems. During the past decade, their application in numerous circular-resonator-based components such as lasers, filters,1 add/drop multiplexers,2 modulators3 and delay lines4,5 has been suggested and demonstrated. In addition, the applicability of circular resonators has been shown to extend beyond telecommunication to the fields of sensing,6 spectroscopy and standardization,7 as well as to basic research in quantum electrodynamics, nonlinear optics and other related...Read full articleRelated content from Photonics MediaArticlesSputter-Coated Optics Improve Machine Vision and Remote SensingFor biomedical instrumentation applications such as fluorescence microscopy and Raman spectroscopy, sputter-coated thin-film interference filters deliver exemplary performance. 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