All-dielectric nanograting for increasing terahertz radiation power of photoconductive antennas

Optics Express
Kemeng WangWeili Zhang

Abstract

Photoconductive antenna (PCA) is a widely used terahertz (THz) radiation source, but its low radiated power limits the signal-to-noise ratio and bandwidth in THz imaging and spectroscopy applications. Here, we achieved significant PCA power enhancement through etching nanograting directly on the surface of the PCA substrate. The integrated nanograting not only maximizes the generation of photocarriers, but also benefits the bias electric field loaded on the photocarriers. Comparing with the conventional PCA, our PCA realizes a frequency independent THz power enhancement of 3.92 times in the range of 0.05-1.6 THz. Our results reported here not only provide a new method for increasing the THz power of PCAs, but also reveal another way that artificial nanostructures affect the PCAs, which paves the way for the subsequent researches of next-generation PCAs.

References

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Nov 29, 2012·Optics Express·Sang-Gil ParkKi-Hun Jeong
Nov 18, 2014·Optics Express·Afshin JoosheshReuven Gordon
Apr 28, 2018·Scientific Reports·Sergey LepeshovEdik U Rafailov
Aug 30, 2018·Small·Nezih Tolga Yardimci, Mona Jarrahi
Feb 7, 2019·Scientific Reports·Mohammad BashirpourMohammad Neshat
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