Nanoscale mapping of optically inaccessible bound-states-in-the-continuum

Zhaogang Dong; Zackaria Mahfoud; Ramón Paniagua-Domínguez; Hongtao Wang; Antonio I. Fernández-Domínguez; Sergey Gorelik; Son Tung Ha; Febiana Tjiptoharsono; Arseniy I. Kuznetsov; Michel Bosman; Joel K. W. Yang

doi:10.1038/s41377-021-00707-2

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Nanoscale mapping of optically inaccessible bound-states-in-the-continuum

Articles

- Nanoscale mapping of optically inaccessible bound-states-in-the-continuum
- Light: Science & Applications Vol. 11, Issue 2, Pages: 188-196(2022)
- Affiliations：
  
  1.Institute of Materials Research and Engineering, A*STAR (Agency for Science, Technology and Research), 2 Fusionopolis Way, #08-03 Innovis, 138634, Singapore, Singapore
  2.Department of Materials Science and Engineering, National University of Singapore, 9 Engineering Drive 1, 117575, Singapore, Singapore
  3.Singapore University of Technology and Design, 8 Somapah Road, 487372, Singapore, Singapore
  4.Departamento de Física Teórica de la Materia Condensada and Condensed Matter Physics Center, Universidad Autónoma de Madrid, 28049, Madrid, Spain
  5.Singapore Institute of Food and Biotechnology Innovation, A*STAR (Agency for Science, Technology and Research), 31 Biopolis Way, #01-02 Nanos, 138669, Singapore, Singapore
- Author bio：
  
  Zhaogang Dong (dongz@imre.a-star.edu.sg)
  Michel Bosman (msemb@nus.edu.sg)
  Joel K. W. Yang (joel_yang@sutd.edu.sg)
- Funds：
- DOI：10.1038/s41377-021-00707-2
  CLC：
- Published：28 February 2022，
  
  Published Online：20 January 2022，
  
  Received：26 June 2021，
  
  Revised：01 December 2021，
  
  Accepted：30 December 2021
- Accepted：
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Dong, Z. G. et al. Nanoscale mapping of optically inaccessible bound-states-in-the-continuum. Light: Science & Applications, 11, 188-196 (2022).
DOI：

Dong, Z. G. et al. Nanoscale mapping of optically inaccessible bound-states-in-the-continuum. Light: Science & Applications, 11, 188-196 (2022). DOI： 10.1038/s41377-021-00707-2.

摘要

Abstract

Bound-states-in-the-continuum (BIC) is an emerging concept in nanophotonics with potential impact in applications

such as hyperspectral imaging

mirror-less lasing

and nonlinear harmonic generation. As true BIC modes are non-radiative

they cannot be excited by using propagating light to investigate their optical characteristics. In this paper

for the 1st time

we map out the strong near-field localization of the true BIC resonance on arrays of silicon nanoantennas

via electron energy loss spectroscopy with a sub-1-nm electron beam. By systematically breaking the designed antenna symmetry

emissive quasi-BIC resonances become visible. This gives a unique experimental tool to determine the coherent interaction length

which we show to require at least six neighboring antenna elements. More importantly

we demonstrate that quasi-BIC resonances are able to enhance localized light emission via the Purcell effect by at least 60 times

as compared to unpatterned silicon. This work is expected to enable practical applications of designed

ultra-compact BIC antennas such as for the controlled

localized excitation of quantum emitters.

关键词

Keywords

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