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Slow-light effect via Rayleigh anomaly and the effect of finite gratings

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Abstract
  • In this Letter, we investigate the slow-light effect of subwavelength diffraction gratings via the Rayleigh anomaly using a fully analytical approach without needing to consider specific grating structures. Our results show that the local group velocity of the transmitted light can be significantly reduced due to the optical vortex, which can inspire a new mechanism to enhance light–matter interactions for optical sensing and photodetection. However, the slow-light effect will diminish as the transmitted light propagates farther from the grating surface, and the slowdown factor decreases as the grating size shrinks.
  • This paper was published in Optics Letters and is made available as an author's peer-reviewed final manuscript, as accepted by the publisher. The paper can be found at the following URL on the OSA website: https://www.osapublishing.org/ol/abstract.cfm?uri=ol-40-22-5339. Systematic or multiple reproduction or distribution to multiple locations via electronic or other means is prohibited and is subject to penalties under law.
  • Keywords: Electromagnetic optics, Subwavelength structures, Diffraction gratings
  • Keywords: Electromagnetic optics, Subwavelength structures, Diffraction gratings
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  • Kim, K. Y., Chong, X., Ren, F., & Wang, A. X. (2015). Slow-light effect via Rayleigh anomaly and the effect of finite gratings. Optics Letters, 40(22), 5339-5342. doi:10.1364/OL.40.005339
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  • 40
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  • 22
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  • National Science Foundation, Directorate for Engineering (ENG) (1342318); National Institutes of Health (NIH) (9R42ES024023).
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