Nanoscale mapping of optically inaccessible bound-states-in-the-continuum.
Light Sci Appl
; 11(1): 20, 2022 Jan 20.
Article
em En
| MEDLINE
| ID: mdl-35058424
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.
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Coleções:
01-internacional
Base de dados:
MEDLINE
Idioma:
En
Revista:
Light Sci Appl
Ano de publicação:
2022
Tipo de documento:
Article
País de afiliação:
Singapura