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 MediaArticlesAdvanced Filters Help Space Lasers Deliver Internet from AboveRapid, on-demand access to information is a necessary facet of daily life in the present “age of communications.” The reliable communication links that society necessitates support...Photonics Spectra March 2024 IssuePhotoacoustic Microscopy Method Delivers Higher SensitivityA multispectral, super-low-dose photoacoustic microscopy (SLD-PAM) system developed by City University of Hong Kong (CUHK) achieves significantly higher sensitivity than traditional optical...BioPhotonics Nov/Dec 2023 IssueOptical Filters Narrow the Focus of Raman Biomedical AnalysisWhile Raman spectroscopy has long been useful in pharmaceutical analysis and the identification of hazardous materials, the technology’s usefulness in biomedicine has also been expanding due to...BioPhotonics Jan/Feb 2024 IssueAcousto-Optic Components Overcome Limitations in Confocal MicroscopyConfocal and multiphoton microscopy are commonly used to provide 3D-resolved images of in vitro or in vivo tissue samples without physical sectioning. 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