Thin film tandem nanoplasmonic photoconductive antenna for high performance terahertz detection
| Autor: | Mohammad Neshat, Mohammadreza Kolahdouz, Mohammad Bashirpour, S. Ghorbani, Jafar Poursafar, Amirali Valinejad |
|---|---|
| Rok vydání: | 2018 |
| Předmět: |
Photocurrent
Nanostructure Materials science Terahertz radiation business.industry Photoconductivity Surface plasmon Physics::Optics 02 engineering and technology Substrate (electronics) Condensed Matter::Mesoscopic Systems and Quantum Hall Effect 021001 nanoscience & nanotechnology Condensed Matter Physics 01 natural sciences 010309 optics Condensed Matter::Materials Science 0103 physical sciences Optoelectronics General Materials Science Electrical and Electronic Engineering Thin film 0210 nano-technology business Plasmon |
| Zdroj: | Superlattices and Microstructures. 120:598-604 |
| ISSN: | 0749-6036 |
| DOI: | 10.1016/j.spmi.2018.06.029 |
| Popis: | Photoconductive antennas (PCA) have attracted lots of attention for terahertz application, due to their room temperature operation and compact design. On the other hand, their main problem is acquiring low output power. Lately, plasmonic structures of different geometries have been proposed to overcome the mentioned issue. Here, we have proposed and simulated a PCA on a silicon-on-sapphire substrate and a layout of a plasmonic nanostructure in which the effect of geometrical parameters of the nanostructure on PCA's output was investigated and optimized. According to the results for one layer plasmonic nanostructure, two different geometries showed more than 700% improvement in the device photocurrent which are related to different types of surface plasmons. By combining these layouts and benefiting from both simultaneously, a final proposed nanostructure was constructed. After optimizing the new structure's parameters, a significant increase of 15400% in photocurrent enhancement was achieved by comparing to the conventional THz PCAs on similar substrate. |
| Databáze: | OpenAIRE |
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