Unusual higher-order nonlinear optical properties in Au-coated triangular Ag-Au nanostructures

被引：7
|
作者：
Mondal, Koushik [1 ]
Biswas, Subrata [1 ]
Singha, Tara [2 ]
Pal, Sudip Kumar [3 ]
Datta, Prasanta K. [2 ]
Ghosh, Sujit Kumar [3 ]
Kumbhakar, Pathik [1 ]
机构：
[1] Natl Inst Technol Durgapur, Dept Phys, Nanosci Lab, Durgapur 713209, W Bengal, India
[2] Indian Inst Technol Kharagpur, Dept Phys, Kharagpur 721302, W Bengal, India
[3] Assam Univ, Dept Chem, Silchar 788011, India
来源：
OPTICS LETTERS | 2021年 / 46卷 / 19期
关键词：
NANOPARTICLES; COMPOSITE;
D O I：
10.1364/OL.439398
中图分类号：
O43 [光学];
学科分类号：
070207 ; 0803 ;
摘要：
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
引用
收藏
页码：4879 / 4882
页数：4
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