From fano to quasi-BIC resonances in individual dielectric nanoantennas

Elizaveta Melik-Gaykazyan, Kirill Koshelev, Jae Hyuck Choi, Sergey S. Kruk, Andrey Bogdanov, Hong Gyu Park, Yuri Kivshar

Research output: Contribution to journalArticlepeer-review

7 Citations (Scopus)

Abstract

Sharp optical resonances in high-index dielectric nanostructures have recently attracted significant attention for their promising applications in nanophotonics. Fano resonances, as well as resonances associated with bound states in the continuum (BIC), have independently shown a great potential for applications in nanoscale lasers, sensors, and nonlinear optical devices. Here, we demonstrate experimentally a close connection between Fano and quasi-BIC resonances excited in individual dielectric nanoantennas. We analyze systematically the resonant response of AlGaAs nanoantennas pumped with a structured light in the near-infrared range. We trace a variation of the scattering spectrum that fully agrees with an analytical expression governed by a Fano parameter and observe directly a transition to a quasi-BIC resonance. Our results suggest a unified approach toward the analysis of sharp resonances in subwavelength nanostructures originating from strong coupling of optical modes that can provide high energy localization for enhanced light-matter interactions.

Original languageEnglish
Pages (from-to)1765-1771
Number of pages7
JournalNano Letters
Volume21
Issue number4
DOIs
Publication statusPublished - 2021 Feb 24

Keywords

  • Bound states in the continuum
  • Fano resonance
  • High-index dielectric nanoparticles
  • Laser spectroscopy
  • Structured light
  • Vector beams

ASJC Scopus subject areas

  • Bioengineering
  • Chemistry(all)
  • Materials Science(all)
  • Condensed Matter Physics
  • Mechanical Engineering

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