Abstract-Terahertz photoconductive antenna based on antireflection dielectric metasurfaces with embedded plasmonic nanodisks

 

Xiao-Qiang Jiang, Wen-Hui Fan, Chao Song, Xu Chen, and Qi Wu

https://www.osapublishing.org/ao/abstract.cfm?uri=ao-60-26-7921

By taking advantage of dielectric metasurfaces and plasmonic nanostructures, a terahertz photoconductive antenna (THz-PCA) is proposed and investigated in detail. The designed dielectric metasurfaces can reduce the optical reflection down to 1.4% and accelerate the switching process (electric conductive to resistive) that broadens the THz spectrum emitted from THz-PCA. Simultaneously, the embedded plasmonic nanostructures can realize 11.2 times enhancement in local electric field without affecting the switching process and the damage threshold of the THz-PCA. Simulated results indicate that the proposed THz-PCA is 70.56 times stronger in THz radiation power than that of the traditional THz-PCA. The significant enhancement ensures the proposed THz-PCA has great prospects in promoting THz technology based on the THz-PCA.

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