Planar narrow bandpass filter based on Si resonant metasurface

Zheng, Z., Komar, A., Zangeneh Kamali, K., Noble, J., Whichello, L., Miroshnichenko, A.E., Rahmani, M. ORCID: 0000-0001-9268-4793, Neshev, D.N. and Xu, L. ORCID: 0000-0001-9071-4311, 2021. Planar narrow bandpass filter based on Si resonant metasurface. Journal of Applied Physics, 130 (5): 053105. ISSN 0021-8979

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Abstract

Optically resonant dielectric metasurfaces offer unique capability to fully control the wavefront, polarisation, intensity or spectral content of light based on the excitation and interference of different electric and magnetic Mie multipolar resonances. Recent advances of the wide accessibility in nanofabrication and nanotechnologies have led to a surge in the research field of high-quality functional optical metasurfaces which can potentially replace or even outperform conventional optical components with ultra-thin features. Replacing conventional optical filtering components with metasurface technology offers remarkable advantages including lower integration cost, ultra-thin compact configuration, easy combination with multiple functions and less restriction on materials. Here we propose and experimentally demonstrate a planar narrow band-pass filter based on the optical dielectric metasurface composed of Si nanoresonators in array. A broadband transmission spectral valley (around 200 nm) has been realised by combining electric and magnetic dipole resonances adjacent to each other. Meanwhile, we obtain a narrow-band transmission peak by exciting a high-quality leaky mode which is formed by partially breaking a bound state in the continuum generated by the collective longitudinal magnetic dipole resonances in the metasurface. Owing to the in-plane inversion symmetry of our nanostructure, the radiation of this antisymmetric mode is inhibited at far field, manifesting itself a sharp Fano-shape peak in the spectrum. Our proposed metasurface-based filter shows a stable performance for oblique light incidence with small angles (within 10 deg). Our work imply many potential applications of nanoscale photonics devices such as displays, spectroscopy, etc.

Item Type: Journal article
Publication Title: Journal of Applied Physics
Creators: Zheng, Z., Komar, A., Zangeneh Kamali, K., Noble, J., Whichello, L., Miroshnichenko, A.E., Rahmani, M., Neshev, D.N. and Xu, L.
Publisher: AIP Publishing
Date: 5 August 2021
Volume: 130
Number: 5
ISSN: 0021-8979
Identifiers:
NumberType
10.1063/5.0058768DOI
1456623Other
Rights: This article may be downloaded for personal use only. Any other use requires prior permission of the author and AIP Publishing. This article appeared in (citation of published article) and may be found at https://aip.scitation.org/doi/10.1063/5.0058768.
Divisions: Schools > School of Science and Technology
Record created by: Laura Ward
Date Added: 08 Nov 2021 16:49
Last Modified: 08 Nov 2021 16:49
URI: http://irep.ntu.ac.uk/id/eprint/44651

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