二硫化钨薄膜双共振上转换荧光增强研究

doi:10.3969/j.issn.1007-5461.2022.04.016

量子电子学报 ›› 2022, Vol. 39 ›› Issue (4): 605-612.doi: 10.3969/j.issn.1007-5461.2022.04.016

二硫化钨薄膜双共振上转换荧光增强研究

洪慧慧, 叶佐东*

( 1 大连工业大学光子学研究所, 辽宁大连116034; 2 大连工业大学基础教学部, 辽宁大连116034 )

收稿日期:2021-01-19 修回日期:2021-03-12 出版日期:2022-07-28 发布日期:2022-07-28
通讯作者: E-mail: h0260416@hit.edu.cn E-mail:E-mail: h0260416@hit.edu.cn
作者简介:洪慧慧( 1996 - ), 女, 安徽芜湖人, 研究生, 主要从事半导体材料光学性质方面的研究。E-mail: 18S058460@stu.hit.edu.cn
基金资助:
Supported by Science and Technology Project of Shenzhen (深圳市科技计划项目, JCYJ20180306171818204, JCYJ20200109113003946)

Double resonance up-conversion fluorescence enhancement of tungsten disulfide films

HONG Huihui, Cho-Tung Yip*

( 1 Research Institute of Phontonics, Dalian Polytechnic University, Dalian 116034, China; 2 Department of Basic Courses Teaching, Dalian Polytechnic University, Dalian 116034, China )

Received:2021-01-19 Revised:2021-03-12 Published:2022-07-28 Online:2022-07-28

摘要/Abstract

摘要： 为探究二维层状过渡金属硫化物的激子效应, 尤其是上转换过程, 以层状WS2 样品为例开展了研究。利用532 nm 连续激光和显微拉曼技术, 探究了WS2 晶体中X0、X􀀀 激子态物理起源和基本物理性质。利用633 nm 连续激光, 实现了WS2 晶体的单光子上转换荧光增强, 证实了其背后的双共振物理机制, 即入射光与X􀀀 激子态共振, 在光学声子A1g、E1 2g 的辅助下跃迁至高能级X0 激子态, 最后自发辐射上转换荧光。此外, 进一步对双共振上转换荧光的影响因素进行了分析, 包括曝光时间、温度和激发功率。拟合结果表明适当增加曝光时间、减小环境温度和增加激发功率, WS2 的上转换荧光效率会得到提升。

关键词: 激光物理, 上转换荧光增强, 双共振拉曼散射效应, 二硫化钨

Abstract: In order to explore the exciton effect of two-dimensional layered transition metal sulfide, especially the up-conversion fluorescence process, the layered WS2 sample was taken as an example to study. Using 532 nm continuous laser and micro-Raman technology, the physical origin and basic properties of X0 and X􀀀 exciton of WS2 crystal were investigated. The continuous laser of 633 nm was used to realize single photon up-conversion fluorescence enhancement, which confirmed the physical mechanism of double resonance, that is, the incident light resonates with the X􀀀 exciton state, then exciton transitions to the high-energy X0 exciton state with the aid of optical phonons A1g and E1 2g, and finally produces spontaneous up-conversion fluorescence. In addition, the influencing factors of X0 were further analyzed including exposure time, temperature and excitation power. The fitting results showed that the up-conversion fluorescence efficiency could be improved by appropriately increasing the exposure time, decreasing the ambient temperature and increasing the excitation power.

Key words: laser physics, up-conversion fluorescence enhancement, double resonance Raman scattering effect, tungsten disulfide

中图分类号:

O437

洪慧慧, 叶佐东. 二硫化钨薄膜双共振上转换荧光增强研究[J]. 量子电子学报, 2022, 39(4): 605-612.

HONG Huihui, Cho-Tung Yip. Double resonance up-conversion fluorescence enhancement of tungsten disulfide films[J]. Chinese Journal of Quantum Electronics, 2022, 39(4): 605-612.

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二硫化钨薄膜双共振上转换荧光增强研究

Double resonance up-conversion fluorescence enhancement of tungsten disulfide films

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