Abstract-Broadband tunable absorber for terahertz waves based on isotropic silicon metasurfaces

Zhengyong Song,  Zhisheng Wang, Maoliang Wei,

https://www.sciencedirect.com/science/article/pii/S0167577X18314629

A broadband tunable absorber is studied based on the silicon metasurface at terahertz frequencies. By tuning the conductivity of silicon, absorptance is more than 90% from 0.497 THz to 1.045 THz with central frequency of 0.771 THz when the conductivity is equal to $\mathit{PleaseCheck}$. Simulated results show that absorptance peak can be modulated from 1% to 100% when the conductivity continuously changes from $\mathit{PleaseCheck}$ to $\mathit{PleaseCheck}$. The central-symmetry structure leads to polarization independence. Our design may be used as optoelectronic modulator, tunable detector, and terahertz switch.