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Title: Terahertz induced transparency in single-layer graphene

We show that the transmission of a terahertz (THz) pulse through single-layer graphene is strongly nonlinear. As the peak electric field of the THz pulse exceeds 50‚ÄČkV/cm, the graphene becomes increasingly transparent to the THz radiation. When field strength reaches 800‚ÄČkV/cm, the increased transparency corresponds to a two-fold decrease in the time-average sheet conductivity of the graphene (time averaged over the duration of the pulse). Time-resolved measurements reveal that the leading portion of the pulse creates transparency for the trailing portion, with a 10-fold suppression in sheet conductivity at the tail of the strongest THz pulse. Comparing the THz-induced transparency phenomena in different sample geometries shows that substrate-free graphene is the best geometry for maximizing the nonlinear transparency effect.
Authors:
; ; ; ; ; ; ;  [1] ;  [2]
  1. Department of Physics, Oregon State University, Corvallis, Oregon 97331-6507 (United States)
  2. School of Electrical and Electronic Engineering, Yonsei University, Seoul (Korea, Republic of)
Publication Date:
OSTI Identifier:
22402382
Resource Type:
Journal Article
Resource Relation:
Journal Name: Applied Physics Letters; Journal Volume: 105; Journal Issue: 22; Other Information: (c) 2014 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; ELECTRIC FIELDS; GRAPHENE; NONLINEAR PROBLEMS; OPACITY; PULSES; SUBSTRATES; THZ RANGE