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

Page view(s)
122
Checked on Feb 09, 2025
Nanoscale mapping of optically inaccessible bound-states-in-the-continuum
Title:
Nanoscale mapping of optically inaccessible bound-states-in-the-continuum
Journal Title:
Light: Science & Applications
Publication Date:
20 January 2022
Citation:
Dong, Z., Mahfoud, Z., Paniagua-Domínguez, R., Wang, H., Fernández-Domínguez, A. I., Gorelik, S., Ha, S. T., Tjiptoharsono, F., Kuznetsov, A. I., Bosman, M., & Yang, J. K. W. (2022). Nanoscale mapping of optically inaccessible bound-states-in-the-continuum. Light: Science & Applications, 11(1). https://doi.org/10.1038/s41377-021-00707-2
Abstract:
AbstractBound-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.
License type:
Attribution 4.0 International (CC BY 4.0)
Funding Info:
This research / project is supported by the A*STAR - SERC Pharos
Grant Reference no. : 1527300025

This research / project is supported by the A*STAR - AME Individual Research Grants
Grant Reference no. : A20E5c0093

This research / project is supported by the A*STAR - Career Development Award
Grant Reference no. : 202D8088

This research / project is supported by the Ministry of Education - Academic Research Fund Tier 2
Grant Reference no. : MOE2019-T2-1-179

This research / project is supported by the National Research Foundation - Competitive Research Programme
Grant Reference no. : CRP20-2017-0001

This research / project is supported by the National Research Foundation - Investigatorship Award Grant
Grant Reference no. : NRFI06-2020-0005

European Union’s Horizon 2020 research and innovation program under grant agreement No 823717 – ESTEEM3.
Description:
ISSN:
2047-7538
Files uploaded: