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Title: Ultrafast optical properties of lithographically defined quantum dot amplifiers

We measure the ultrafast optical response of lithographically defined quantum dot amplifiers at 40‚ÄČK. Recovery of the gain mostly occurs in less than 1 picosecond, with some longer-term transients attributable to carrier heating. Recovery of the absorption proceeds on a much longer timescale, representative of relaxation between quantum dot levels and carrier recombination. We also measure transparency current-density in these devices.
Authors:
; ; ;  [1] ;  [2]
  1. Quantum Electronics and Photonics Division, National Institute of Standards and Technology, Boulder, Colorado 80305 (United States)
  2. Department of Electrical and Computer Engineering, University of Illinois, Urbana, Illinois 61801 (United States)
Publication Date:
OSTI Identifier:
22283187
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 104; Journal Issue: 6; Other Information: (c) 2014 AIP Publishing LLC; Country of input: International Atomic Energy Agency (IAEA)
Country of Publication:
United States
Language:
English
Subject:
75 CONDENSED MATTER PHYSICS, SUPERCONDUCTIVITY AND SUPERFLUIDITY; 77 NANOSCIENCE AND NANOTECHNOLOGY; ABSORPTION; AMPLIFIERS; CHARGE CARRIERS; CURRENT DENSITY; ENERGY LEVELS; GAIN; OPACITY; QUANTUM DOTS; RECOMBINATION; RELAXATION; TRANSIENTS