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

页码：4879 / 4882

页数：4

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