Optimizing Nonlinear Optical Visibility of Two-Dimensional Materials
| Autor: | Ningning Xuan, Hanqi Liu, Qi Liu, Xianchong Miao, Weishu Wu, Zhengzong Sun, Minbiao Ji |
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| Rok vydání: | 2017 |
| Předmět: |
Materials science
Photoluminescence business.industry Graphene Second-harmonic generation Nonlinear optics 02 engineering and technology 021001 nanoscience & nanotechnology 01 natural sciences law.invention Crystal Reflection (mathematics) Optics Interference (communication) law 0103 physical sciences Optoelectronics General Materials Science Grain boundary 010306 general physics 0210 nano-technology business |
| Zdroj: | ACS Applied Materials & Interfaces. 9:34448-34455 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.7b09807 |
| Popis: | Two-dimensional (2D) materials have attracted broad research interests across various nonlinear optical (NLO) studies, including nonlinear photoluminescence (NPL), second harmonic generation (SHG), transient absorption (TA), and so forth. These studies have unveiled important features and information of 2D materials, such as in grain boundaries, defects, and crystal orientations. However, as most research studies focused on the intrinsic NLO processes, little attention has been paid to the substrates underneath. Here, we discovered that the NLO signal depends significantly on the thickness of SiO2 in SiO2/Si substrates. A 40-fold enhancement of the NPL signal of graphene was observed when the SiO2 thickness was varied from 270 to 125 nm under 800 nm excitation. We systematically studied the NPL intensity of graphene on three different SiO2 thicknesses within a pump wavelength range of 800–1100 nm. The results agreed with a numerical model based on back reflection and interference. Furthermore, we have ext... |
| Databáze: | OpenAIRE |
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