Ag2S quantum dots in the fields of picosecond and femtosecond UV and IR pulses: optical limiting, nonlinear absorption and refraction properties

被引：15

作者：

Fu, Yue ^{[1
,2
]}

Ganeev, Rashid A. ^{[1
]}

Zhao, Chen ^{[1
,2
]}

Rao, Konda Srinivasa ^{[1
]}

Maurya, Sandeep Kumar ^{[1
]}

Yu, Weili ^{[1
]}

Zhang, Ke ^{[1
,2
]}

Guo, Chunlei ^{[1
,3
]}

机构：

[1] Chinese Acad Sci, Changchun Inst Opt Fine Mech & Phys, State Key Lab Appl Opt, Guo China US Photon Lab, Changchun 130033, Jilin, Peoples R China

[2] Univ Chinese Acad Sci, Beijing 100039, Peoples R China

[3] Univ Rochester, Inst Opt, Rochester, NY 14627 USA

来源：

APPLIED PHYSICS B-LASERS AND OPTICS | 2019年 / 125卷 / 01期

基金：

中国国家自然科学基金;

关键词：

SILICATE-GLASSES; NANOPARTICLES; NANOCRYSTALS; SCATTERING; PBSE;

D O I：

10.1007/s00340-018-7110-y

中图分类号：

O43 [光学];

学科分类号：

070207 ; 0803 ;

摘要：

We demonstrate strong optical nonlinearities of silver sulfide (Ag2S) quantum dots (QDs) in the ultraviolet range. The 4-nm Ag2S QDs were prepared by chemical method and analyzed using picosecond (800nm and 400nm, 200ps) and femtosecond (800nm and 400nm, 60fs) laser pulses. Our Z-scan measurements show that these QDs have large nonlinear absorption coefficient (10(-3) cm W-1) at 400nm. We also demonstrate the transient absorption and optical limiting in Ag2S QDs. Variations of the signs of nonlinear refractive indices and nonlinear absorption coefficients of QDs are demonstrated by changing pulse width and wavelength of probe radiation.

引用

页数：10

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