Plasmonic bound states in the continuum for unpolarized weak spatially coherent light

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

View graph of relations

Author(s)

  • Zhuo WANG
  • Yao LIANG
  • Jiaqi QU
  • Mingjie CUI
  • Zhi CHENG
  • Changyuan YU

Detail(s)

Original languageEnglish
Pages (from-to)260-269
Journal / PublicationPhotonics Research
Volume11
Issue number2
Online published1 Feb 2023
Publication statusPublished - Feb 2023

Link(s)

Abstract

Plasmonic resonances empowered by bound states in the continuum (BICs) offer unprecedented opportunities to tailor light–matter interaction. However, excitation of high quality-factor (Q-factor) quasi-BICs is often limited to collimated light at specific polarization and incident directions, rendering challenges for unpolarized focused light. The major hurdle is the lack of robustness against weak spatial coherence and poor polarization of incident light. Here, addressing this limitation, we demonstrate sharp resonances in symmetric plasmonic metasurfaces by exploiting BICs in the parameter space, offering ultraweak angular dispersion effect and polarization-independent performance. Specifically, a high-Q (≈71) resonance with near-perfect absorption (>90%) is obtained for the input of unpolarized focused light covering wide incident angles (from 0° to 30°). Also, giant electric and magnetic field enhancement simultaneously occurs in quasi-BICs. These results provide a way to achieve efficient near-field enhancement using focused light produced by high numerical aperture objectives. © 2023 Chinese Laser Press

Research Area(s)

Citation Format(s)

Plasmonic bound states in the continuum for unpolarized weak spatially coherent light. / WANG, Zhuo; LIANG, Yao; QU, Jiaqi et al.
In: Photonics Research, Vol. 11, No. 2, 02.2023, p. 260-269.

Research output: Journal Publications and ReviewsRGC 21 - Publication in refereed journalpeer-review

Download Statistics

No data available