Hybrid Computational Simulation and Study of Terahertz Pulsed Photoconductive Antennas
| Autor: | Navid Barani, Reza Safian, Ramin Emadi, A. Zeidaabadi Nezhad |
|---|---|
| Rok vydání: | 2016 |
| Předmět: |
Materials science
Frequency band Terahertz radiation Physics::Optics 02 engineering and technology 01 natural sciences Electromagnetic radiation 010309 optics 020210 optoelectronics & photonics Optics 0103 physical sciences 0202 electrical engineering electronic engineering information engineering Electrical and Electronic Engineering Instrumentation Photocurrent Radiation Condensed Matter::Other business.industry Photoconductivity Carrier lifetime Solver Condensed Matter::Mesoscopic Systems and Quantum Hall Effect Condensed Matter Physics Optoelectronics Antenna (radio) business |
| Zdroj: | Journal of Infrared, Millimeter, and Terahertz Waves. 37:1069-1085 |
| ISSN: | 1866-6906 1866-6892 |
| DOI: | 10.1007/s10762-016-0299-0 |
| Popis: | A photoconductive antenna (PCA) has been numerically investigated in the terahertz (THz) frequency band based on a hybrid simulation method. This hybrid method utilizes an optoelectronic solver, Silvaco TCAD, and a full-wave electromagnetic solver, CST. The optoelectronic solver is used to find the accurate THz photocurrent by considering realistic material parameters. Performance of photoconductive antennas and temporal behavior of the excited photocurrent for various active region geometries such as bare-gap electrode, interdigitated electrodes, and tip-to-tip rectangular electrodes are investigated. Moreover, investigations have been done on the center of the laser illumination on the substrate, substrate carrier lifetime, and diffusion photocurrent associated with the carriers temperature, to achieve efficient and accurate photocurrent. Finally, using the full-wave electromagnetic solver and the calculated photocurrent obtained from the optoelectronic solver, electromagnetic radiation of the antenna and its associated detected THz signal are calculated and compared with a measurement reference for verification. |
| Databáze: | OpenAIRE |
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