The quality factor (Q), describing the rate of energy loss from a resonator, is a defining performance metric for nanophotonic devices. Suppressing cavity radiative losses enables strong nonlinear optical responses or low-power operation to be achieved. Exploiting long-lived, spatially-confined bound states in the continuum (BICs) has emerged from the numerous approaches considered as a promising route to boost nanophotonic Q factors. Initial research explored the formation mechanisms of various types of BICs, drawing parallels to topological physics. With these fundamentals now established, we review the recent application of BICs in passive and active nanophotonic devices.
Bibliographical noteFunding Information:
H.-G.P. acknowledges the support from the National Research Foundation of Korea (NRF) grants funded by the Korean government (MSIT) (2021R1A2C3006781 and 2020R1A4A2002828) and the Institute for Information & Communications Technology Promotion (IITP) grant (2020-0-00841). K.-H.K. acknowledges the support from the NRF grant (NRF-2019R1C1C1006681). M.-S.H. acknowledges the support from the NRF grant (NRF-2020R1I1A1A01074347). K.-Y.J. acknowledges the support from the NRF grant (NRF-2020R1I1A1A01066655).
© 2022, The Author(s).
ASJC Scopus subject areas
- Physics and Astronomy(all)