Quasi bound states in the continuum with few unit cells of photonic crystal slab

Publication: Research - peer-reviewJournal article – Annual report year: 2017

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Bound states in the continuum (BICs) in photonic crystal slabs represent the resonances with an infinite quality (Q)-factor, occurring above the light line for an infinitely periodic structure. We show that a set of BICs can turn into quasi-BICs with a very high Q-factor even for two or three unit cell structures. They are explained by a viewpoint of BICs originating from the tight-binding of individual resonances of each unit cell as in semiconductors. Combined with a reciprocal-space matching technique, the microcavities based on quasi-BICs can achieve a Q-factor as high as defect-based PhC microcavities. These results may enable the experimental studies of BICs in a compact platform as well as realizing high-Q mirrorless microcavities.
Original languageEnglish
Article number5
JournalApplied Physics Letters
Volume111
Issue number3
Pages (from-to)031114
ISSN0003-6951
DOIs
StatePublished - 2017
CitationsWeb of Science® Times Cited: 5
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