Thermally tunable metasurface mode switch between Fano resonance and Breit–Wigner resonance

Abstract

In this work, the vanadium dioxide is introduced into a mirror-symmetric double splitting semicircle ring resonator to constitute a tunable metasurface mode switch between the Fano resonance and Breit-Wigner resonance, which is controlled by two external temperatures. The numerical simulation results show that the proposed metasurface expresses the Fano resonance around 1258 nm when the temperatures are T1=27 ℃ and T2=82 ℃. When T1= T2 =27 ℃ or 82 ℃, the Breit-Wigner resonance mode can be excited near 1100 nm. This mode switch behavior can be well understood with the surface current distribution and multipole electromagnetic decomposition.

Tunable achromatic metalens for generating focused vortex beam in the near-infrared range

“…Metasurfaces are artificially structured surfaces that provide unprecedented control over the characteristics of light at subwavelength scales. [9][10][11][12] Metasurfaces not only exhibit strong optical control capabilities, but also have the advantages of small size and easy integration, making them ideal focused OV (FOV) generators. Yu et al used a metasurface arranged with eight V-shaped antennas separated by 45°phase intervals to generate OV beams in the IR wavelength range.…”