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Tunable absorbers are promising for reconfigurable metasurface applications. Here a tunable terahertz (THz) perfect absorber is proposed which consists of high resistance silicon (undoped silicon) and can realize the switch between perfect reflection and perfect absorption (optical pumping, 1064 nm continuous wave). The proposed THz absorber exhibits perfect absorption around 0.74 THz and a 90% absorption...
Photons carry spin angular momentum and orbital angular momentum, vortex beams with helical phase fronts provide a new understanding of optical and physical phenomena. Here, the creation of four longitudinal polarized vortices with arbitrary topological charges is demonstrated using all‐silicon metasurfaces in terahertz band, integrating propagation phase and Pancharatnam–Berry phase. This efficient...
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