• Advanced Photonics
  • Vol. 1, Issue 1, 010503 (2019)
Shaimaa I. Azzam and Alexander V. Kildishev
Author Affiliations
  • Purdue University, School of Electrical and Computer Engineering and Birck Nanotechnology Center, West Lafayette, Indiana, United States
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    Abstract

    An explanation of bound states in the continuum (BICs) is offered. With particular attention to Friedrich–Wintgen BICs, the commentary presents a study by Bogdanov et al., which appears in the same issue of Advanced Photonics.

    What, exactly, is a bound state in the continuum (BIC)? A BIC is an unconventional state that remains localized even upon its coexistence with the continuum of radiating modes. In theory, a BIC is characterized by the infinite radiative quality factor and zero linewidth.1 Amongst the various types of BICs, the so-called Friedrich–Wintgen BIC arises due to the destructive interference of two resonances coupled to the same radiation channel. Once the eigenvalue of one of the resonances becomes purely real, the state turns into a BIC. Generally, Friedrich–Wintgen BICs lie in the vicinity of the frequency crossings of the uncoupled resonances.

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    Shaimaa I. Azzam, Alexander V. Kildishev. Waves stranded at sea: bound states in the continuum in a strong coupling regime[J]. Advanced Photonics, 2019, 1(1): 010503
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    Category: News and Commentaries
    Received: --
    Accepted: --
    Published Online: Mar. 4, 2019
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