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Terahertz radiation of a butterfly-shaped photoconductive antenna(invited)

Publication ,  Journal Article
Zhang, J; Tuo, M; Liang, M; Ng, WR; Gehm, ME; Xin, H
Published in: Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering
April 25, 2019

The terahertz(THz) far-field radiation properties of a butterfly-shaped photoconductive antenna (PCA) were experimentally studied using a home-built THz time-domain spectroscopy(THz-TDS) setup. To distinguish the contribution of in -gap photocurrent and antenna structure to far -field radiation, polarization -dependent THz field was measured and quantified as the illuminating laser beam moved along the bias field within the gap region of electrodes. The result suggests that, although the far -field THz radiation originates from the in -gap photocurrent, the antenna structure of butterfly -shaped PCA dominates the overall THz radiation. In addition, to explore the impact of photoconductive material, radiation properties of butterfly -shaped PCAs fabricated on both low -temperature -grown GaAs (LT - GaAs) and semi-insulating GaAs (Si-GaAs) were characterized and compared. Consistent with previous experiments, it is observed that while Si-GaAs-based PCA can emit higher THz field than LT-GaAsbased PCA at low laser power, it would saturate more severely as laser power increased and eventually be surpassed by LT-GaAs-based PCA. Beyond that, it is found the severe saturation effect of Si-GaAs was due to the longer carrier lifetime and higher carrier mobility, which was confirmed by the numerical simulation.

Duke Scholars

Published In

Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

DOI

ISSN

1007-2276

Publication Date

April 25, 2019

Volume

48

Issue

4

Related Subject Headings

  • Optoelectronics & Photonics
  • 4009 Electronics, sensors and digital hardware
 

Citation

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Zhang, J., Tuo, M., Liang, M., Ng, W. R., Gehm, M. E., & Xin, H. (2019). Terahertz radiation of a butterfly-shaped photoconductive antenna(invited). Hongwai Yu Jiguang Gongcheng/Infrared and Laser Engineering, 48(4). https://doi.org/10.3788/IRLA201948.0402001
Zhang, J., M. Tuo, M. Liang, W. R. Ng, M. E. Gehm, and H. Xin. “Terahertz radiation of a butterfly-shaped photoconductive antenna(invited).” Hongwai Yu Jiguang Gongcheng/Infrared and Laser Engineering 48, no. 4 (April 25, 2019). https://doi.org/10.3788/IRLA201948.0402001.
Zhang J, Tuo M, Liang M, Ng WR, Gehm ME, Xin H. Terahertz radiation of a butterfly-shaped photoconductive antenna(invited). Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering. 2019 Apr 25;48(4).
Zhang, J., et al. “Terahertz radiation of a butterfly-shaped photoconductive antenna(invited).” Hongwai Yu Jiguang Gongcheng/Infrared and Laser Engineering, vol. 48, no. 4, Apr. 2019. Scopus, doi:10.3788/IRLA201948.0402001.
Zhang J, Tuo M, Liang M, Ng WR, Gehm ME, Xin H. Terahertz radiation of a butterfly-shaped photoconductive antenna(invited). Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering. 2019 Apr 25;48(4).

Published In

Hongwai yu Jiguang Gongcheng/Infrared and Laser Engineering

DOI

ISSN

1007-2276

Publication Date

April 25, 2019

Volume

48

Issue

4

Related Subject Headings

  • Optoelectronics & Photonics
  • 4009 Electronics, sensors and digital hardware