期刊
OPTICS LETTERS
卷 46, 期 19, 页码 4879-4882出版社
OPTICAL SOC AMER
DOI: 10.1364/OL.439398
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资金
- [332(Sanc.)]
- [ST/P/ST/16G-24/2018]
Novel local field-assisted nonlinear optical effects were observed in triangular-shaped core-shell Ag-Au nanoparticles, exhibiting superior optical switching performance and optical limiting thresholds under specific pump wavelengths, indicating the potential of these nanoparticles in advanced optoelectronic applications.
Here, we report hitherto unobserved local field (LF)-assisted pump wavelength-dependent nonlinear optical (NLO) effects of three-photon (3PA)-induced four-photon absorption (4PA) at 532 nm and two-photon-induced 3PA at 730 nm in triangular-shaped core-shell Ag-Au nanoparticles (TrAg@Au) by femtosecond Z-scan. The shell thickness-dependent enhancement in the LF is observed by a COMSOL simulation. The intensity-dependent interplay between saturable and reverse-saturable absorptions along with switching of nonlinear (NL) phase is reported at 730 nm, showing the superiority of TrAg@Au in optical switching (OS). The optical limiting (OL) threshold (Fth) of 5.9 (6.5) mJ/cm(2) at 730 (532) nm boost their potential over benchmarked materials. (C) 2021 Optical Society of America
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