Examination on Optical Properties of Two-Dimensional Materials Using Near-Field Optical Microscopy

L. Chen, X. Zhao, W. Niu, C. Xu, Z. Hou, X. Zhang and Q. Liu

Acta Microscopica 28, 1089 (2019)
Two-dimensional layered materials are a new class of materials that have emerged in recent years.Usually, it is formed by strong covalent bonds or ionic bonds within the layers.The interlayer are stacked together by weak Van der Waals force.The purpose of this paper is to investigate the role of the band structure of materials in experimental research, and other physical properties,in order to prepare the material into a device. Measuring its two-dimensional optical characteristics under an optical microscope can understand the use scenarios and development trends of 2D materials in electronics initially.At present, graphene is the hottest research on the market, and it is also the first discoveredtwo-dimensional material, it is characterized by a working belt bandwidth, good optical reflectivity, and short reaction time, but the graphene material itself is the electronic structure with zero band gap .especially with a low damage threshold and a small adjustable modulation depth,In particular, its low damage threshold, small adjustable area in the adjustment breadth and its poor thermal effect limit its role in the field of high-energy lasers.Especiallythe characteristics of Low damage threshold and small adjustable modulation depth, especially low damage threshold, small adjustable area in adjustment breadth and poor thermal effect etc. limit its role in the field of high-energy lasers.In this paper, obtain the plasma characteristics of the nanostructured surface of graphene by using s-SNOM and chemical vapor deposition.And relate the Plasma size on the plasma surface nanopattern to the excited wavelength and structure closely in a certain mode, and enhance resonance in a gap of 25 nm wide;and using s-SNOM to study other methods for preparing characteristic structure of plasma on the surface of graphene nanomaterials.The experimental results show that molybdenum disulfide is the material that can reflects the two-dimensional layered structure best, its optical properties are related to the number of layers closely.Moreover, for the construction of photovoltaic devices, photodetector and light emitters, it is important to study different nanostructures using scattering near-field optical microscopy.It is important to study different nanostructures by scattering near-field optical microscopy.Infrared light excites the optical properties of graphene and molybdenum disulfide.