| Issue |
TST
Volume 13, Number 3, September 2020
|
|
|---|---|---|
| Page(s) | 112 - 118 | |
| DOI | https://doi.org/10.1051/tst/2020133112 | |
| Published online | 06 December 2021 | |
Invited Paper
Terahertz photoconductive antenna with all-dielectric nanopillars
1
Center for Terahertz Waves and College of Precision Instrument and Optoelectronics Engineering, Tianjin University, Tianjin 300072, China
2
School of Electrical and Computer Engineering, Oklahoma State University, Stillwater, OK 74078
* Email: gjq@tju.edu.cn
Received:
28
September
2020
Photoconductive antennas (PCAs), as a popular terahertz (THz) radiation source, have been widely used in spectroscopy, material characterization, biological imaging and detection of hazardous materials. However, PCAs have a relatively low energy conversion efficiency from femtosecond laser pulses to THz radiation which often limits the signal-to-noise ratio and bandwidth of THz imaging and spectroscopy systems. To address these limitations, here we report a THz photoconductive antenna emitter with all-dielectric nanopillars integrated on top of the SI-GaAs substrate to increase the generated photocarriers, which achieves a broadband and frequency insensitive THz power enhancement factor around 1.25 at frequencies 0.05 - 1.6 THz. Our results reported here provide a new method for increasing the THz power of PCAs, which paves the way for the subsequent researches of next-generation PCAs.
Key words: Terahertz / Nanopillars / Photoconductive antenna / All-dielectric metamaterials
© The Authors 2020. Published by EDP Sciences on behalf of the University of Electronic Science and Technology of China.
This is an Open Access article distributed under the terms of the Creative Commons Attribution License (https://creativecommons.org/licenses/by/4.0), which permits unrestricted use, distribution, and reproduction in any medium, except for commercial purposes, provided the original work is properly cited.