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Title: Metasurface external cavity laser

A vertical-external-cavity surface-emitting-laser is demonstrated in the terahertz range, which is based upon an amplifying metasurface reflector composed of a sub-wavelength array of antenna-coupled quantum-cascade sub-cavities. Lasing is possible when the metasurface reflector is placed into a low-loss external cavity such that the external cavity—not the sub-cavities—determines the beam properties. A near-Gaussian beam of 4.3° × 5.1° divergence is observed and an output power level >5 mW is achieved. The polarized response of the metasurface allows the use of a wire-grid polarizer as an output coupler that is continuously tunable.
Authors:
; ;  [1] ;  [2] ; ;  [1] ;  [3]
  1. Department of Electrical Engineering, University of California, Los Angeles, California 90095 (United States)
  2. (United States)
  3. Northrop Grumman Aerospace Systems, Redondo Beach, California 90278 (United States)
Publication Date:
OSTI Identifier:
22486144
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 107; Journal Issue: 22; Other Information: (c) 2015 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; ANTENNAS; BEAMS; GRIDS; LASERS; SURFACES; WAVELENGTHS