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Ultralow-threshold laser using super-bound states in the continuum

Authors
Hwang, Min-SooLee, Hoo-CheolKim, Kyoung-HoJeong, Kwang-YongKwon, Soon-HongKoshelev, KirillKivshar, YuriPark, Hong-Gyu
Issue Date
5-Jul-2021
Publisher
NATURE RESEARCH
Citation
NATURE COMMUNICATIONS, v.12, no.1
Indexed
SCIE
SCOPUS
Journal Title
NATURE COMMUNICATIONS
Volume
12
Number
1
URI
https://scholar.korea.ac.kr/handle/2021.sw.korea/127725
DOI
10.1038/s41467-021-24502-0
ISSN
2041-1723
Abstract
Wavelength-scale lasers provide promising applications through low power consumption requiring for optical cavities with increased quality factors. Cavity radiative losses can be suppressed strongly in the regime of optical bound states in the continuum; however, a finite size of the resonator limits the performance of bound states in the continuum as cavity modes for active nanophotonic devices. Here, we employ the concept of a supercavity mode created by merging symmetry-protected and accidental bound states in the continuum in the momentum space, and realize an efficient laser based on a finite-size cavity with a small footprint. We trace the evolution of lasing properties before and after the merging point by varying the lattice spacing, and we reveal this laser demonstrates the significantly reduced threshold, substantially increased quality factor, and shrunken far-field images. Our results provide a route for nanolasers with reduced out-of-plane losses in finite-size active nanodevices and improved lasing characteristics. Though laser action has been reported for optical bound states in the continuum (BIC) cavities with high quality factors, these BIC lasers lacked practical applicability. Here, the authors report an ultralow-threshold super-BIC laser featuring merged symmetry-protected and accidental BICs.
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