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Chung, Il-Sug
Nano-Optoelectronics Lab.
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Quasi bound states in the continuum with few unit cells of photonic crystal slab

Author(s)
Taghizadeh, AlirezaChung, Il-Sug
Issued Date
2017-07
DOI
10.1063/1.4990753
URI
https://scholarworks.unist.ac.kr/handle/201301/23706
Fulltext
http://aip.scitation.org/doi/10.1063/1.4990753
Citation
APPLIED PHYSICS LETTERS, v.111, no.3, pp.031114
Abstract
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.
Publisher
AMER INST PHYSICS
ISSN
0003-6951

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