Nonlinear optical properties of colloidal CdSe/ZnS quantum dots in PMMA

被引：18
|
作者：
Pan, Han [1 ]
Chu, Hongwei [1 ]
Li, Ying [2 ,3 ]
Qi, Na [2 ,3 ]
Zhao, Shengzhi [1 ]
Li, Guiqiu [1 ]
Li, Dechun [1 ]
机构：
[1] Shandong Univ, Sch Informat Sci & Engn, Qingdao 266237, Peoples R China
[2] Shandong Univ, State Educ Minist, Key Lab Colloid & Interface Chem, Jinan 250100, Peoples R China
[3] Shandong Univ, Sch Chem & Chem Engn, Jinan 250100, Peoples R China
来源：
NANOTECHNOLOGY | 2020年 / 31卷 / 19期
基金：
中国国家自然科学基金;
关键词：
semiconductor colloidal quantum dots; impact behavior; nonlinear optical (NLO) properties; Z-scan technique; nanophotonics; ABSORPTION CROSS-SECTION; 2-PHOTON ABSORPTION; SEMICONDUCTOR NANOCRYSTALS; ENERGY-TRANSFER; EMISSION; SIZE; DEVICES; CARBON; MOS2;
D O I：
10.1088/1361-6528/ab7045
中图分类号：
TB3 [工程材料学];
学科分类号：
0805 ; 080502 ;
摘要：
The colloidal CdSe/ZnS quantum dots (QDs) in the PMMA polymer film with different QDs concentrations were fabricated. The influence of QDs concentration and excitation pump energy on nonlinear optical (NLO) properties of PMMA capped CdSe/ZnS QDs was investigated by the Z-scan technique with nanosecond laser pulses in the near-infrared spectral band. A large effective nonlinear absorption coefficient (beta(eff) similar to -10(-13) esu) due to the saturable absorption was observed. It was found that the appropriate concentration could lead to the reinforcement of NLO effect. In addition, the impact of the excitation energy on the nonlinear refractive index n(2), real and imaginary parts of the third-order nonlinear optical susceptibility was also performed. This study involving the light-matter interactions in the colloidal quantum dots will benefit potential NLO-based applications of optoelectronics, optical modulation and photonics.
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页数：9
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