期刊
NANO LETTERS
卷 21, 期 2, 页码 967-972出版社
AMER CHEMICAL SOC
DOI: 10.1021/acs.nanolett.0c03818
关键词
hybrid metasurface; bound states; light emission; MoS2; Q-factor; far field
类别
资金
- NSFC [11734012, 12074267]
- Science & Technology Project of Guangdong [2020B010190001]
- National Research Foundation, Prime Minister's Office, Singapore under its Competitive Research Programme (CRP) [NRF CRP22-2019-0006]
- Advanced Research and Technology Innovation Centre (ARTIC) [R-261-518-004-720]
The study investigates bound states in the continuum (BIC) in a Mie nanoresonator based on MoS2, revealing the existence of symmetry protected BIC and quasi-BIC (q-BIC).
High quality factor (Q-factor) and strong field localization in nanostructures is a newly emerged direction in nanophotonics. The bound states in the continuum (BIC) have been investigated in nanoparticles with infinite Q-factor. We report BIC in molybdenum disulfide (MoS2) based Mie nanoresonator suspended in air. The ultrathin nanodisk supports symmetry protected BIC, and the quasi-BIC (q-BIC) are exploited by breaking the symmetry of the structure. The strongly localized modes in our MoS2-based nanodisk sustain a similar magnetic field profile before and after symmetry breaking, unlike what has been previously reported in silicon-based structures. Strong directional emission is observed in BIC regime from a hybrid configuration with a resonator placed on the stacked metal-dielectric layers, which transform BIC to q-BIC and exploit highly directional light. The structure persists emission with small variations in normalized intensity at distorted symmetry. The giant Q-factor in q-BIC is highly desired for biosensing and optical filters.
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