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Saturable absorption and nonlinear refraction in free-standing carbon nanotube film: Theory and experiment
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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en
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11
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Carbon, Volume 186, pp. 509-519
Abstract
The nonlinear absorption and refraction of free-standing films made of single-walled carbon nanotubes (SWNTs) have been investigated experimentally and theoretically. By solving the quantum kinetic equations that take into account both the intra- and interband transitions, we obtain the analytical expression for the SWNT nonlinear conductivity. The nonlinear absorption coefficient and saturation intensity of the film comprising randomly orientated SWNTs have been calculated in a broad spectral range spanning over M11, S11, and S22 absorption bands. The effects of the laser pulse duration and dynamic Burstein−Moss shift on the saturation intensity have been revealed. We demonstrate in the experiment that, under irradiation with femtosecond laser pulses, the absorption modulation depth of SWNT film at resonance wavelength 1375 nm is as high as 30%. The observed saturation intensity minimum is red-shifted with respect to the absorption maximum due to the dynamic Burstein−Moss shift. The saturation intensity within the S22 band is 26−fold lower than that out of the band at 795 nm. The closed-aperture z-scan measurements reveal the negative nonlinear refractive index n2 = −3.1 × 10−12 cm2/W at 795 nm.
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Funding Information: This work is supported by the Academy of Finland grants no. 343393 , 323053 , 340115 , 334270 , and Flagship Programme “Photonics Research and Innovation (PREIN)” decision no. 320165 , the Ministry of Education and Science of the Russian Federation (state registration number AAAA-A19-119021890083-0 ) and Horizon 2020 grants no. 823728 (DiSetCom) and no. 823878 (TERASSE). A.N. acknowledges the Russian Foundation for Basic Research (project no. 20-03-00804 ). P.K. is supported by Horizon 2020 IF TURANDOT Project No. 836816 . Publisher Copyright: © 2021 The Authors
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Vanyukov, V V, Shuba, M V, Nasibulin, A G, Svirko, Y P, Kuzhir, P P & Mikheev, G M 2022, 'Saturable absorption and nonlinear refraction in free-standing carbon nanotube film: Theory and experiment', Carbon, vol. 186, pp. 509-519. https://doi.org/10.1016/j.carbon.2021.10.054