Planar narrow bandpass filter based on Si resonant metasurface

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.

Monochrome metasurface lens design for optical wireless transceivers

“…Metasurface is a 2D, ultrathin, nanostructured surface composed of wavelength-scale plasmonic or dielectric elements (metaatoms). The metaatom can be designed to efficiently control light characteristics such as wavefront, polarization, phase delay, and intensity [5][6][7]. Although strong light-matter interactions at the nanoscale support surface plasmons, plasmonic metasurfaces suffer from high Ohmic losses inherent in metals at optical frequencies.…”

Enhanced four-wave mixing from multi-resonant silicon dimer-hole membrane metasurfaces

“…Therefore, one can obtain an efficient local control on the electromagnetic fields of light at nanoscale. A variety of resonant modes supported by silicon nanostructures have been investigated, including magnetic dipole resonances [42], Fano resonances [12,43,44], anapole states [45,46], bound states in the continuum [47][48][49][50][51][52][53].…”

Study on Spectral Selective Manipulation Characteristics of Surface Multilevel Micro–Nano Structures by FDTD Simulation

“…The optical filter is a typical optical device, which can realize the selection of optical wavelength by making the light at a specific wavelength penetrate or cut off [ 1 , 2 , 3 , 4 ]. In recent years, with the development of micro–nano processing technology, optical filters based on metal micro–nano structures have been widely used, and have great potential in solar thermal photovoltaic systems, biological sensors, thermal radiators, and other fields [ 5 , 6 , 7 ].…”