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Type: Journal article
Title: Two-photon absorption and saturable absorption of mid-IR in graphene
Author: Malouf, A.
Henderson-Sapir, O.
Set, S.
Yamashita, S.
Ottaway, D.J.
Citation: Applied Physics Letters, 2019; 114(9):091111-1-091111-5
Publisher: AIP Publishing
Issue Date: 2019
ISSN: 0003-6951
Statement of
Andrew Malouf, Ori Henderson-Sapir, Sze Set, Shinji Yamashita, and David J. Ottaway
Abstract: We report on the response of graphene to high intensity mid-IR radiation and show that graphene exhibits saturable absorption and significant two-photon absorption in the spectral region of 1.55 lm to 3.50 lm (0.35 eV to 0.80 eV). We find that the effective modulation depth of multilayer graphene is limited by two-photon absorption, which will affect its performance as a laser mode-locking element. The measured saturation intensities of femtosecond pulses were found to depend on the third power of photon energy when we combined our results with others reported in the literature, while those of longer pulses were found to have a square root dependence.
Rights: © 2019 Author(s). Published under license by AIP Publishing
DOI: 10.1063/1.5088641
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