Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Wang, Jiajun; Li, Peishen; Zhao, Xingqi; Qian, Zhiyuan; Wang, Xinhao; Wang, Feifan; Zhou, Xinyi; Han, Dezhuan; Peng, Chao; Shi, Lei; Zi, Jian

doi:10.3788/pi.2024.r01

Photonics Insights

2024

DOI: 10.3788/pi.2024.r01

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Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Jiajun Wang,

Peishen Li,

Xingqi Zhao

et al.

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2024

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Cited by 4 publications

References 292 publications

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Symmetry-protected bound states in the continuum on an integrated photonic platform

Lu,

Feng,

Sun

2024

Nanophotonics

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Bound states in the continuum (BICs) have attracted much attention in the field of nanophotonics owing to their ability to trap photons without loss. Recently, a low-refractive-index (RI) waveguide loaded on a high-RI slab structure was demonstrated to support BICs. However, strict control of structural parameters is required due to the accidental nature of those BICs. Here, we propose a novel structure consisting of two low-RI vertically coupled waveguides loaded on a high-RI slab. This structure supports symmetry-protected BICs (SP-BICs), which do not require strict control of the geometric parameters. Such SP-BICs can also possess an infinitely high quality factor in resonant structures, which can be harnessed for ultranarrow-bandwidth spatial and spectral filters. Our work opens a new way of harnessing BICs on an integrated photonic platform for realizing nanophotonic circuits and devices.

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Symmetry-protected bound states in the continuum on an integrated photonic platform

Lu,

Feng,

Sun

2024

Nanophotonics

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Detection of Low-Concentration Biological Samples Based on a QBIC Terahertz Metamaterial Sensor

Dong,

Wei,

Wei

et al. 2024

Sensors

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Quasi-bound state in the continuum (QBIC) can effectively enhance the interaction of terahertz (THz) wave with matter due to the tunable high-Q property, which has a strong potential application in the detection of low-concentration biological samples in the THz band. In this paper, a novel THz metamaterial sensor with a double-chain-separated resonant cavity structure based on QBIC is designed and fabricated. The process of excitation of the QBIC mode is verified and the structural parameters are optimized after considering the ohmic loss by simulations. The simulated refractive index sensitivity of the sensor is up to 544 GHz/RIU, much higher than those of recently reported THz metamaterial sensors. The sensitivity of the proposed metamaterial sensor is confirmed in an experiment by detecting low-concentration lithium citrate (LC) and bovine serum albumin (BSA) solutions. The limits of detection (LoDs) are obtained to be 0.0025 mg/mL (12 μM) for LC and 0.03125 mg/mL (0.47 μM) for BSA, respectively, both of which excel over most of the reported results in previous studies. These results indicate that the proposed THz metamaterial sensor has excellent sensing performances and can well be applied to the detection of low-concentration biological samples.

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A journey through bound states in the continuum in periodic optical structures

Liu,

Xiao

2024

Photonics Insights

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Optical bound states in the continuum in periodic structures: mechanisms, effects, and applications

Cited by 4 publications

References 292 publications

Symmetry-protected bound states in the continuum on an integrated photonic platform

Symmetry-protected bound states in the continuum on an integrated photonic platform

Detection of Low-Concentration Biological Samples Based on a QBIC Terahertz Metamaterial Sensor

A journey through bound states in the continuum in periodic optical structures

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