Abstract
We propose a transmissive terahertz (THz) metasurface consisting of full phase modulation (~2π) subwavelength silicon post cells. A broadband THz beam deflector with a bandwidth of 0.3 THz is achieved via the phase gradient of a transmitted wave originating from dipole resonances. The light transmittance through the unit cells is above 94%, indicating that the deflector achieves a high-efficiency operation. Since the phase retardations of any two cross vertical directions in a unit cell are equal, the device is polarization-independent. Our design was verified by numerical simulations based on the finite element method. The deflector provides a feasible approach to ameliorate the THz system.
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