Observation of Unidirectional Bound States in the Continuum
Name
1904.11464v2(1).pdf
Description
Accepted version
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5.75 MB
Format
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Checksum (MD5)
577f3d7164e7ddb6a253159d0d041c94
Author(s)
Yin, Xuefan
Jin, Jicheng
Soljacic, Marin
Peng, Chao
Zhen, Bo
Alternative Title
Observation of topologically enabled unidirectional guided resonances
Date Issued
April 2020
Journal
Nature
Publisher
Springer Science and Business Media LLC
Citation
Yin, Xuefan et al. "Observation of topologically enabled unidirectional guided resonances." Nature 580, 7804 (April 2020): 467–471 © 2020 The Author(s)
Version
Author's final manuscript
Abstract
Unidirectional radiation is important for various optoelectronic applications, such as lasers, grating couplers and optical antennas. However, almost all existing unidirectional emitters rely on the use of materials or structures that forbid outgoing waves—that is, mirrors, which are often bulky, lossy and difficult to fabricate. Here we theoretically propose and experimentally demonstrate a class of resonances in photonic crystal slabs that radiate only towards one side of the slab, with no mirror placed on the other side. These resonances, which we name ‘unidirectional guided resonances’, are found to be topological in nature: they emerge when a pair of half-integer topological charges1–3 in the polarization field bounce into each other in momentum space. We experimentally demonstrate unidirectional guided resonances in the telecommunication regime by achieving single-side radiative quality factors as high as 1.6 × 105. We further demonstrate their topological nature through far-field polarimetry measurements. Our work represents a characteristic example of applying topological principles4,5 to control optical fields and could lead to energy-efficient grating couplers and antennas for light detection and ranging.
MIT Department
Massachusetts Institute of Technology. Department of Physics
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Creative Commons Attribution-Noncommercial-Share Alike
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DOI of Published Version
https://doi.org/10.1038/s41586-020-2181-4
