High‐Efficiency Phase and Polarization Modulation Metasurfaces

Abstract

Use of metasurfaces to control the characteristics of electromagnetic waves is an emerging trend at present. Multifunctional metasurfaces, which can modulate multiple wave parameters, greatly reduce the complexity and enrich the functionality of optical systems. Herein, a high‐efficiency multifunctional metasurface for operation in the terahertz band is proposed and demonstrated. Use of a trilayer structure allows the working efficiency to reach 85% at the designed operating frequency. The phase and polarization states of the transmitted waves are modulated individually via subtle adjustment of the geometric parameters of each layer. Two terahertz‐band vector beam generators are demonstrated based on the proposed metasurface. The two devices individually generate radial and azimuthal terahertz vortex beams that can carry arbitrary orbital angular momentum. The experimental results demonstrate the validity of the proposed approach. This method represents a route toward easy fabrication of high‐performance phase and polarization modulation metasurfaces that can improve the information‐carrying capabilities of terahertz systems and offers benefits for structured light generation, optical information security, and optical communication applications.

Single-layered non-interleaved spin-insensitive metasurfaces for wavefront engineering

“…Metasurfaces, the two-dimensional version of artificially engineered metal/dielectric structures that control the amplitude, phase, and polarization of light by varying the spatial dimensions and orientation of meta-elements, are promising candidates to mold the outgoing wavefront [1][2][3][4][5][6][7][8][9][10] . Polarization of the incident light plays a key role in light-matter interaction for wavefront manipulation; however, geometry of meta-elements makes the metasurfaces sensitive to the incident polarization of the light.…”

Wideband and Tunable Reflective Cross-Polarization Conversion Metasurface for TeraHertz Applications

“…W ITH the advancement of communication systems and the growing demand for ultra high speed communications, the electronics and photonics communities are witnessing the emergence of waveguides, filters, sensors, amplifiers, polarization converters, etc in the THz regime (around 0.1 -10 THz) for a variety of applications including imaging [1], [2], [3], sensing [4], [5], [6], and communications [7], [8], [9]. However, there is a limited research in the development of wideband polarization converters together with dynamically controlling the polarization state of THz waves.…”

Arbitrary polarization angle and wavefront manipulation of linearly polarized waves using PB phase

“…Polarization and beam shape have been well investigated because they have great impacts on performances of wireless communications, imaging, radar systems, etc [1][2][3][4][5][6]. Conventionally, the polarization and wavefront of electromagnetic (EM) waves can be respectively controlled by waveplates and lenses from nature materials, which, however, suffer from bulky sizes or limited bandwidths [7][8][9][10].…”