Metasurface quantum-cascade laser with electrically switchable polarization

Investigation of broadband terahertz generation from metasurface

“…They have been reported to be adept at providing a myriad of unconventional properties. These properties give potential applications of plasmonic metasurfaces, including nanoantennas, sensing, lasing and plasmonic devices [1][2][3][4][5]. The fields of metamaterials have made spectacular progress in recent years.…”

Photonic Engineering Technology for the Development of Terahertz Quantum Cascade Lasers

“…Therefore, it is attainable to manipulate the outcoupling of mode energy by monolithically integrating side-emitter structures. [84] The configuration characteristics of THz VECSELs, that is, efficient energy outcoupling of the gain cavities and scalable array size, contribute to good performance including single-mode emission, small beam divergence (≈3° × 3°), [138,139] high power (1.35 W at 6 K and 830 mW at 77 K in pulse mode), [101] and high efficiency (PSE ≈ 767 mW A −1 and WPE ≈ 2%). [55,92] By coupling one reflector along with the antenna loop to control the lasing mode propagating direction, unidirectional emission was achieved along the waveguide with an enhancement of WPE (≈1%) in the predefined direction.…”

“…The capability of dynamically modulating the beam polarization state from linear to near-circular was demonstrated. [138] Along each DLSP waveguide, an array of subwavelength gold antennas arranged as a second-order grating is patterned to scatter the light into the far field vertically, with its polarization along the orientation of the antennas.…”

“…[137] Copyright 2016, Springer Nature. [138] Copyright 2017, Optical Society of America. Microdisk lasers working on whisperinggallery modes (WGMs) were demonstrated to yield ultralow threshold currents of a few milliamps thanks to the small cavity size and high modal quality factors.…”

Metasurfaces enabling structured light manipulation: advances and perspectives [Invited]

“…(1) From static to dynamic Switchable, tunable, reconfigurable, and programmable operations are highly desired, i.e., dynamic metasurfaces enabling robust structured light manipulation. The recent demonstrations on optically switchable photonic metasurfaces [60] , electrically switchable polarization [61] , electrically tunable metasurface [62] , active tuning of all-dielectric metasurfaces [63] , electromechanically reconfigurable plasmonic metamaterial [64] , optically reconfigurable metasurfaces based on phase change materials [65] , reconfigurable nanomechanical metamaterials [66] , electromagnetic reprogrammable holograms [67] , and reprogrammable metasurfaces [68] provide the possibilities.…”