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Nanomaterials 2019, 9(2), 291; https://doi.org/10.3390/nano9020291

Nonlinear Optical Studies of Gold Nanoparticle Films

1
The Guo China-US Photonics Laboratory, State Key Laboratory of Applied Optics, Changchun Institute of Optics, Fine Mechanics and Physics, Chinese Academy of Sciences, Changchun 130033, China
2
The Institute of Optics, University of Rochester, Rochester, NY 14627, USA
*
Authors to whom correspondence should be addressed.
Received: 31 December 2018 / Revised: 3 February 2019 / Accepted: 7 February 2019 / Published: 19 February 2019
(This article belongs to the Special Issue Synthesis and Modification of Nanostructured Thin Films)
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Abstract

Gold films are widely used for different applications. We present the results of third- and high-order nonlinear optical studies of the thin films fabricated from Au nanoparticle solutions by spin-coating methods. These nanoparticles were synthesized by laser ablation of bulk gold in pure water using 200 ps, 800 nm pulses. The highest values of the nonlinear absorption coefficient (9 × 10−6 cm W−1), nonlinear refractive index (3 × 10−11 cm2 W−1), and saturation intensity (1.3 × 1010 W cm−2) were achieved using 35 fs, 400 nm pulses. We also determined the relaxation time constants for transient absorption (220 fs and 1.6 ps) at 400 nm. The high-order harmonic generation was studied during propagation of 35 fs, 800 nm pulses through the plasma during the ablation of gold nanoparticle film and bulk gold. The highest harmonic cutoff (29th order) was observed in the plasma containing gold nanoparticles. View Full-Text
Keywords: gold thin film; nonlinear absorption; nonlinear refraction; transient absorption; nanoparticles; high-order harmonics gold thin film; nonlinear absorption; nonlinear refraction; transient absorption; nanoparticles; high-order harmonics
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Rout, A.; Boltaev, G.S.; Ganeev, R.A.; Fu, Y.; Maurya, S.K.; Kim, V.V.; Rao, K.S.; Guo, C. Nonlinear Optical Studies of Gold Nanoparticle Films. Nanomaterials 2019, 9, 291.

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