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

Jitao Zhang,  Mingguang Tuo,  Min Liang,  Wei-Ren Ng,  Michael E. Gehm,  Hao Xin

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文章导航 > 红外与激光工程  > 2019 >  48(4): 402001-0402001(9)
Jitao Zhang, Mingguang Tuo, Min Liang, Wei-Ren Ng, Michael E. Gehm, Hao Xin. Terahertz radiation of a butterfly-shaped photoconductive antenna(invited)[J]. 红外与激光工程, 2019, 48(4): 402001-0402001(9). doi: 10.3788/IRLA201948.0402001
引用本文: Jitao Zhang, Mingguang Tuo, Min Liang, Wei-Ren Ng, Michael E. Gehm, Hao Xin. Terahertz radiation of a butterfly-shaped photoconductive antenna(invited)[J]. 红外与激光工程, 2019, 48(4): 402001-0402001(9). doi: 10.3788/IRLA201948.0402001
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Jitao Zhang, Mingguang Tuo, Min Liang, Wei-Ren Ng, Michael E. Gehm, Hao Xin. Terahertz radiation of a butterfly-shaped photoconductive antenna (invited)[J]. Infrared and Laser Engineering, 2019, 48(4): 402001-0402001(9). doi: 10.3788/IRLA201948.0402001
Citation: Jitao Zhang, Mingguang Tuo, Min Liang, Wei-Ren Ng, Michael E. Gehm, Hao Xin. Terahertz radiation of a butterfly-shaped photoconductive antenna (invited)[J]. Infrared and Laser Engineering, 2019, 48(4): 402001-0402001(9). doi: 10.3788/IRLA201948.0402001
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Terahertz radiation of a butterfly-shaped photoconductive antenna(invited)

doi: 10.3788/IRLA201948.0402001
  • 1.

    Department of Electrical and Computer Engineering,University of Arizona,Tucson,AZ,85721 USA;

  • 2.

    Fischell Department of Bioengineering,University of Maryland,College Park,Maryland,20742 USA;

  • 3.

    Department of Electrical and Computer Engineering,Duke University,Durham,NC,27708 USA

基金项目: 

National Science Foundation(1126572)

详细信息
    作者简介:

    Jitao Zhang (1985-),male,Assistant Research Professor,Doctor.His research is focused on optics and precision instrumentattion,including optical interferometry,terahertz antenna and spectroscopy,and Brillouin microscopy.Email:zhangjt06@gmail.com

  • 中图分类号: TN821+.4

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

  • 1.

    Department of Electrical and Computer Engineering,University of Arizona,Tucson,AZ,85721 USA;

  • 2.

    Fischell Department of Bioengineering,University of Maryland,College Park,Maryland,20742 USA;

  • 3.

    Department of Electrical and Computer Engineering,Duke University,Durham,NC,27708 USA

Funds: 

National Science Foundation(1126572)

More Information
    Author Bio:

    Jitao Zhang (1985-),male,Assistant Research Professor,Doctor.His research is focused on optics and precision instrumentattion,including optical interferometry,terahertz antenna and spectroscopy,and Brillouin microscopy.Email:zhangjt06@gmail.com

  • 摘要: 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-GaAs-based 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.
    Abstract: 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-GaAs-based 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.
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出版历程
  • 收稿日期:  2018-11-14
  • 修回日期:  2018-11-14
  • 刊出日期:  2019-04-25

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

doi: 10.3788/IRLA201948.0402001
  • 1. Department of Electrical and Computer Engineering,University of Arizona,Tucson,AZ,85721 USA;
  • 2. Fischell Department of Bioengineering,University of Maryland,College Park,Maryland,20742 USA;
  • 3. Department of Electrical and Computer Engineering,Duke University,Durham,NC,27708 USA
    • 作者简介:

    Jitao Zhang (1985-),male,Assistant Research Professor,Doctor.His research is focused on optics and precision instrumentattion,including optical interferometry,terahertz antenna and spectroscopy,and Brillouin microscopy.Email:zhangjt06@gmail.com

  • 收稿日期: 2018-11-14
  • 修回日期: 2018-11-14
  • 刊出日期: 2019-04-25
基金项目:

National Science Foundation(1126572)

  • 中图分类号: TN821+.4

摘要: 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-GaAs-based 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.

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