Observation of spatial self-phase modulation induced via two competing mechanisms.
Opt Lett
; 45(10): 2850-2853, 2020 May 15.
Article
em En
| MEDLINE
| ID: mdl-32412484
ABSTRACT
Two spatial self-phase modulation (SSPM) patterns were observed in suspensions of Bi2TeSe2 nanosheets. Two mechanisms were found to produce SSPM with different occurrence times and power dependence. The Type I (narrow) rings are attributed to the coherent third-order nonlinear optical Kerr effect, which induces self-diffraction in 2D materials, and the Type II (wide) rings are assigned to the contribution of a thermal effect. The nonlinear refractive index of Bi2TeSe2 is found to be 2.30×10-5cm2W-1 at 700 nm. The findings described here provide an explanation for the formation of rings in 2D systems due to SSPM.
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MEDLINE
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2020
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Article