Second-order optical nonlinearity in Gallium(II)–Selenide
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Journal Title
Journal ISSN
Volume Title
Sähkötekniikan korkeakoulu |
Author
Date
2018-03-26
Department
Major/Subject
Photonics
Mcode
S3010
Degree programme
NanoRad - Master’s Programme in Nano and Radio Sciences (TS2013)
Language
en
Pages
54+1
Series
Abstract
Nonlinear optics of two-dimensional (2D) layered materials is currently at the centre of significant research effort. This final project is to investigate several aspects of second-order optical nonlinearity phenomena in atomically-thin Gallium(II)–Selenide (GaSe). The work includes the preparation of thin-layered GaSe samples via mechanical exfoliation and the subsequent investigation of their nonlinear optical properties via multi-photon microscopy (MPM) and a pump-probe setup. The scientific objective of the work is to understand the frequency-dependent nonlinear optical responses in atomically thin GaSe devices. The power dependent second harmonic generation (SHG) and sum-frequency (SFG) are measured. Four-wave mixing (FWM) was observed for the first time in GaSe. These results pave the way to fully understanding various nonlinear optical responses in GaSe.Description
Supervisor
Sun, ZhipeiThesis advisor
Wang, YadongKeywords
Gallium-Selenide, second-harmonic generation, nonlinear optics, multi-photon microscopy