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  • Received: Jun. 27, 2020

    Accepted: Aug. 18, 2020

    Posted: Sep. 30, 2020

    Published Online: Oct. 9, 2020

    The Author Email: Liping Shang (shangliping@swust.edu.cn)

    DOI: 10.3788/COL202018.113701

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    Hu Deng, Weiwei Qu, Quancheng Liu, Zhixiang Wu, Liping Shang. Terahertz radiation enhancement in photoconductive antennas with embedded split-ring resonators[J]. Chinese Optics Letters, 2020, 18(11): 113701

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Chinese Optics Letters, Vol. 18, Issue 11, 113701 (2020)

Terahertz radiation enhancement in photoconductive antennas with embedded split-ring resonators

Hu Deng1,2, Weiwei Qu1, Quancheng Liu1, Zhixiang Wu1, and Liping Shang1,2,*

Author Affiliations

  • 1School of Information Engineering, Southwest University of Science and Technology, Mianyang 621010, China
  • 2Joint Laboratory for Extreme Conditions Matter Properties, Southwest University of Science and Technology, Mianyang 621010, China

Abstract

This Letter proposes a novel method for enhancing terahertz (THz) radiation from microstructure photoconductive antennas (MSPCA). We present two types of MSPCA, which contain split-ring resonators (SRRs) and dipole photoconductive antennas (D-PCAs). The experimental results reveal that when the femtosecond laser is pumping onto the split position of the SRR, the maximum THz radiation power is enhanced by 92 times compared to pumping at the electrode edge of the D-PCA. Two π phase shifts occur as the pumping laser propagates from the negative electrode to the positive electrode. Analysis shows that photoinduced carrier charges move within the split position of the SRR.

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