This proposal, entitled "Development of new optical sensors and new characterization techniques in visible and terahertz spectra", focuses on the design and implementation of new characterization and measurement technologies that, in particular, will be applied to the characterization of the response of different materials (graphene, MoS2,...) and nanodevices. The different techniques that will be developed are based on the measurement of the device response of the photocurrent under light excitation in the visible and in the sub-THz and THz ranges. Photocurrent and THz spectroscopies will allow the study of, among others, phenomena such as the anomalous photovoltaic effect, the dielectric response of materials in the THz range, the electrical properties and quality of semiconductor layers, etc. In particular, the project focuses on the use of two-dimensional (2d) materials such as graphene and molybdenum disulfide for the development and fabrication of new transistors to be used as THz sensors. The development will use atomistic and TCAD models respectively for the simulation of 2d materials and devices based on them and FDTD (Finite Differences Time Domain) techniques will be used to optimize the response of transistors and sensor antennas. Sensors will be physically based on electron plasma oscillations in the transistor channel, but the possible thermoelectric contribution based on the Seebeck effect to the sensor response will also be studied. The new sensors will be characterized in sub-THz (0.15THz-0.6THz) and THz (1-5THz) in the 4-300K range and will be integrated into an imaging system for demonstration and evaluation of their functionality.
Funding_entity: CONSEJERÍA DE EDUCACIÓN Y CULTURA DE LA JUNTA DE CASTILLA Y LEÓN
Period: 06/11/2020 - 31/10/2023
Principal investigator and Coordinator: Yahya Moubarak MEZIANI