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

Metasurface opens a gateway to manipulate electromagnetic properties by establishing various resonance modes. But the vast majority of metasurface resonance modes are statically adjustable. 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 T (1) = 27 degrees C and T (2) = 82 degrees C. When T (1) = T (2) = 27 degrees C or 82 degrees C, 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.