Strong electric field enhancement near an amorphous silicon metasurface with non-vertical symmetry

Abstract

In this work, we propose a novel method to our knowledge for realizing a leakage mode with a super flat band through the modulation of two Friedrich–Wintgen bound states in the continuum (FW BICs) of a non-vertical symmetry metasurface. This unique mode is formed by partially breaking the BIC generated from the first excited collective magnetic dipole (MD) resonance in a sub-diffraction periodic system, which exhibits a low group velocity of 16 731 m s−1, while its quality factor (Q factor) is 217. We calculate that the near electric field enhancement reached 808 times at an incident angle θ of 9°22′. Our findings provide unique opportunities for realizing strong-enhanced nonlinear effects in metasurfaces.

Graphical abstract: Strong electric field enhancement near an amorphous silicon metasurface with non-vertical symmetry

Supplementary files

Article information

Article type
Communication
Submitted
10 Apr 2025
Accepted
03 Jun 2025
First published
11 Jun 2025

Nanoscale Horiz., 2025, Advance Article

Strong electric field enhancement near an amorphous silicon metasurface with non-vertical symmetry

Z. Qu, W. Shi, Z. Wang, C. Zhang and H. Liu, Nanoscale Horiz., 2025, Advance Article , DOI: 10.1039/D5NH00225G

To request permission to reproduce material from this article, please go to the Copyright Clearance Center request page.

If you are an author contributing to an RSC publication, you do not need to request permission provided correct acknowledgement is given.

If you are the author of this article, you do not need to request permission to reproduce figures and diagrams provided correct acknowledgement is given. If you want to reproduce the whole article in a third-party publication (excluding your thesis/dissertation for which permission is not required) please go to the Copyright Clearance Center request page.

Read more about how to correctly acknowledge RSC content.

Social activity

Spotlight

Advertisements