Bulletin of the American Physical Society
APS March Meeting 2018
Monday–Friday, March 5–9, 2018; Los Angeles, California
Session L07: Optical Spectroscopic Measurements of 2D Materials
11:15 AM–2:03 PM,
Wednesday, March 7, 2018
LACC Room: 153B
Sponsoring Units: GIMS DMP
Chair: Amber McCreary, NIST -Natl Inst of Stds & Tech
Abstract: L07.00005 : Optimizing Nonlinear Optical Visibility of Two-dimensional Materials*
12:27 PM–12:39 PM
Two-dimensional materials have demonstrated interesting nonlinear optical (NLO) properties. Despite extensive researches, little attention has been paid to the relationship between the nonlinear optical strength of 2D materials and the properties of the substrates they are sitting on. In this work, we discovered that the strength of nonlinear optical signal depends significantly on the SiO2 thickness in the SiO2/Si substrates. A 40-fold increase of graphene nonlinear photoluminescence (NPL) signal was observed when the SiO2 thickness was varied from 270 nm to 125 nm under 800nm excitation. Furthermore, we have extended our measurements to include transient absorption (TA) and second harmonic generation (SHG) of graphene and MoS2, confirming that SiO2 thickness has similar effects on all of the three major types of NLO signals. Our observations provide a critical reference for NLO researches of two-dimensional materials, and our model may serve as a quick guidance for choosing the optimum substrates to conduct nonlinear optics and optoelectronic studies.
*We thank the financial supports from the National Key Research and Development Program of China;National Natural Science Foundation of China; Shanghai Rising Star program;Shanghai Action Planprogram.
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