Polarization-independent and all-optically modulated multiband metamaterial coherent perfect absorber

A polarization-independent, all-optically modulated multiband metamaterial coherent perfect absorber (CPA) is proposed. Numerical simulation results reveal that the absorber can be controlled over a wide range of ampli-tudes by changing the phase difference of two incident light beams. The all-optical modulation can be extended to telecom wavelengths, allowing for simultaneous modulation of absorption at 1310 nm and 1550 nm. In addition, switchable logical gate states can be achieved at the dip between absorption peaks. The proposed absorber utilizes bound states in the continuum (BIC) mode to realize another absorption band, expanding the application range and enhancing its flexibility. The results suggest that the proposed absorber has a promising modulated optical response, with potential applications in developing optical switches, smart multi-band ab-sorbers, telecom devices and so on.

Automated summary

A polarization-independent, all-optically modulated multiband metamaterial coherent perfect absorber (CPA) is proposed, which can be controlled by changing the phase difference of two incident light beams. The absorber can be modulated at telecommunication wavelengths, allowing for simultaneous modulation at 1310 nm and 1550 nm. Switchable logical gate states can also be achieved. The absorber utilizes bound states in the continuum (BIC) mode to realize another absorption band, expanding its application range and flexibility. The results suggest promising applications in optical switches, smart multi-band absorbers, and telecom devices.