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

• 来源期刊: 中国光学快报（英文版）
• 年，卷（期）: 2020,（11）
• 所属期刊栏目: Infrared and Terahertz Photonics
• 页码范围: 82-87
• 页数: 6页
• 语种: 英文
• DOI: 10.3788/COL202018.113701

摘要

This Letter proposes a novel method for enhancing terahertz(THz)radiation from microstructure photocon-ductive 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 com-pared 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.