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2The 30th International Conference on Advanced Laser Technologies N-O-6
ALT'23
Ultrafast spectroscopy and optoelectronic THz devices of nano-
materials
M.Burdanova1,2
1-Center for Photonics and 2D Materials, Moscow Institute of Physics and Technology, 9 Institutsky Lane,
141700 Dolgoprudny, Russia 2-Institute of Solid State Physics, Russian Academy of Sciences, 142432 Chernogolovka, Russia
The existing and continuously growing THz technologies demand compact, fast, broadband high- performance devices. One-dimensional (1D) nanomaterials hold high potential for the implementation of efficient THz optoelectronics. By focusing on these applications, it is important to characterize the nature and dynamics of photoexcited states in these materials. By employing optical pump Terahertz (THz) probe spectroscopy, ultrafast photocarrier dynamics can be accessed. Therefore, we systematically studied the range of 1D nano-materias such as carbon nanotubes (CNT), boron nitrate nanotubes (BNNT), MoS2 nanotubes (MoS2 NT), WS 2 nanotubes (WS2 nanotubes) and their heterostructures. These materials have a unique terahertz photoconductivity that can be changed from anomalous (positive AT/T, negative photoconductivity) to natural (positive photoconductivity) due to mobile free charges with charge carrier mobility comparable to their 2D counterparts. In addition, the presence of excitons and their dynamics in a given rarity when measured by the pump-probe method. Thus, in our work, we show the coexistence of charge carriers and excitons in these structures [1].Such unique properties can be used in a wide range of applications[2-4].This project was supported by the RSF project # 22-72-1003.
