Chinese Journal of Quantum Electronics ›› 2022, Vol. 39 ›› Issue (4): 605-612.doi: 10.3969/j.issn.1007-5461.2022.04.016

• Nonlinear Optics • Previous Articles     Next Articles

Double resonance up-conversion fluorescence enhancement of tungsten disulfide films

HONG Huihui, Cho-Tung Yip*   

  1. ( 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

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

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