Enhancing and tailoring light-matter interaction in the near-infrared by all-dielectric metasurfaces supporting silicon-slot quasi-bound state in the continuum modes

J. F. Algorri, D. C. Zografopoulos, Y. Ding, V. Dmitriev, J. M. López-Higuera, J. M. Sánchez-Pena, L. C. Andreani, M. Galli, F. Dell'Olio*

*Corresponding author for this work

Research output: Chapter in Book/Report/Conference proceedingArticle in proceedingsResearchpeer-review

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Abstract

Light-matter interaction is crucial in many application domains of nanophotonics, including biosensing, trapping at the nanoscale, nonlinear optics, and lasing. Many approaches, mainly based on photonic and plasmonic resonant structures, have been investigated to enhance and tailor the interaction, but those based on all-dielectric metasurfaces have several unique advantages: low loss, easy excitation and readout, possibility of engineering the optical field distribution with many degrees of freedom, and electric tuning. Here we show that properly designed all-dielectric metasurfaces can support silicon-slot quasi-bound states in the continuum modes resonating in the near-infrared, strongly confining light in air and, consequently, enhancing light-matter interaction. Some samples of the designed metasurface have been fabricated in a silicon-on-sapphire wafer by e-beam lithography and reactive ion etching. The optical characterization of the chip has confirmed the excitation of the quasi-bound state in the continuum resonant modes, with measured Q-factor values exceeding 700.

Original languageEnglish
Title of host publicationLaser Resonators, Microresonators, and Beam Control XXV
EditorsVladimir S. Ilchenko, Andrea M. Armani, Julia V. Sheldakova
Number of pages4
PublisherSPIE - International Society for Optical Engineering
Publication date2023
Article number1240702
ISBN (Electronic)9781510659193
DOIs
Publication statusPublished - 2023
EventLaser Resonators, Microresonators, and Beam Control XXV 2023 - San Francisco, United States
Duration: 31 Jan 20231 Feb 2023

Conference

ConferenceLaser Resonators, Microresonators, and Beam Control XXV 2023
Country/TerritoryUnited States
CitySan Francisco
Period31/01/202301/02/2023
SeriesProceedings of SPIE - The International Society for Optical Engineering
Volume12407
ISSN0277-786X

Keywords

  • Biosensing
  • Bound states in the continuum
  • Metamaterials
  • Nanofabrication
  • Silicon metasurfaces
  • Symmetry-protected modes

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