Shah, Y. D. , Grant, J. , Hao, D., Kenney, M. , Pusino, V. and Cumming, D. R.S. (2018) Ultra-narrow line width polarization-insensitive filter using a symmetry-breaking selective plasmonic metasurface. ACS Photonics, 5(2), pp. 663-669. (doi: 10.1021/acsphotonics.7b01011)
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Abstract
Plasmonic metasurfaces provide unprecedented control of the properties of light. By designing symmetry-breaking nanoholes in a metal sheet and engineering the optical properties of the metal using geometry, highly selective transmission and polarisation control of light is obtained. To date such plasmonic filters have exhibited broad (> 200 nm) transmission linewidths in the NIR and as such are unsuitable for applications requiring narrow passbands, e.g. multi-spectral imaging. Here we present a novel sub-wavelength elliptical and circular nanohole array in a metallic film that simultaneously exhibits high transmission efficiency, polarisation insensitivity and narrow linewidth. The experimentally obtained linewidth is 79 nm with a transmission efficiency of 44%. By examining the electric and magnetic field distributions for various incident polarisations at the transmission peak we show that the narrowband characteristics are due to a Fano resonance. Good agreement is obtained between the experimental data, simulations and analytical calculations. Our design can be modified to operate in other regions of the electromagnetic spectrum and these filters may be integrated with suitable detectors such as photodiodes and single photon avalanche diode (SPAD) arrays.
| Item Type: | Articles |
|---|---|
| Status: | Published |
| Refereed: | Yes |
| Glasgow Author(s) Enlighten ID: | Cumming, Professor David and Pusino, Dr Vincenzo and Hao, Miss Danni and Grant, Dr James and Shah, Dr Yash Diptesh and Kenney, Dr Mitchell Guy |
| Authors: | Shah, Y. D., Grant, J., Hao, D., Kenney, M., Pusino, V., and Cumming, D. R.S. |
| College/School: | College of Science and Engineering > School of Engineering > Electronics and Nanoscale Engineering |
| Journal Name: | ACS Photonics |
| Publisher: | American Chemical Society |
| ISSN: | 2330-4022 |
| ISSN (Online): | 2330-4022 |
| Published Online: | 12 December 2017 |
| Copyright Holders: | Copyright © 2017 American Chemical Society |
| First Published: | First published in ACS Photonics 5(2): 663-669 |
| Publisher Policy: | Reproduced in accordance with the copyright policy of the publisher |
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