Fine manipulation of terahertz wavesviaall-silicon metasurfaces with an independent amplitude and phase

Abstract

Integrating independent wavefront controls into one device can meet the increasing demand for high-capacity flat electromagnetic devices. Simultaneously independent control of amplitude and phase is pivotal for completely manipulating the...

Optically Tunable Terahertz Metasurface Absorber

“…[14] Wen reported a broadband THz absorber based on Ti 3 C 2 T x MXene sponge foam, showing high THz absorption over 99.99% ranging from 0.3 to 1.65 THz. [15] Metamaterials, due to their powerful ability for electromagnetic manipulation, have attracted considerable research interests, and have been widely used in metalens, [17,18] holography, [19,20] vortex generator, [21][22][23][24] wave plate, [25] filter, [26] absorber. [27] The metamaterial absorber was first proposed by Landy in 2008.…”

“…Metamaterials, due to their powerful ability for electromagnetic manipulation, have attracted considerable research interests, and have been widely used in metalens, [ 17,18 ] holography, [ 19,20 ] vortex generator, [ 21–24 ] wave plate, [ 25 ] filter, [ 26 ] absorber. [ 27 ] The metamaterial absorber was first proposed by Landy in 2008.…”

Manipulation of polarization conversion and multiplexing via all-silicon phase-modulated metasurfaces

“…Once the metasurface no longer has the properties of a half-wave plate, the outgoing wave will exist with LCP and RCP components under CP incidence, meaning that it makes sense to independently manipulate cross and co-polarization. Recently, phase-modulated metasurfaces, which can realize the independent manipulation of co-and cross-polarized output waves under CP incidence, have been reported [23][24][25] . In this paper, a metasurface composed of meta-atoms with a phase difference of 2π=3 between linear orthogonal polarizations is introduced to generate LCP and RCP waves with different amplitudes under CP wave incidence so as to be superimposed into a specific elliptically polarized (EP) wave (see Fig.…”

Graphene-based terahertz bias-driven negative-conductivity metasurface

“…Therefore, metasurfaces are typically combined with other materials to form a hybrid metasurface for achieving the exible control of THz waves by applying external control conditions to the device. [15][16][17][18] Graphene is a single-atom form of carbon with a sp 2hybridization honeycomb crystal plane. Since its rst successful preparation in 2004, 19 monolayer graphene has shown high carrier mobility, broadband at optical response, tunable bandgaps, high electronic and optical conductivities, and many other unique electrical and optical properties, thus garnering extensive research attention.…”