Abstract-Improvement of terahertz photoconductive antennas array using crossfingers structure

  

Farzad Moradiannejad

https://link.springer.com/article/10.1007/s10825-021-01661-3

The purpose of this research is to improve terahertz photoconductive antenna arrays to enhance their output power. The improved arrays were designed based on crossfingers structure as a high power terahertz generator. The finite difference time domain method was used for modelling and simulating of the generator. The characteristics of the improved array and its emphasis points and key parameters were studied. This structure demonstrated that the terahertz antenna array can generate drastically increased terahertz field amplitudes compared to other structures. The output power of the improved array enhanced as large as 74.1 µW. The improved array remains in an unsaturated region of operation, whereas the optical pumping with high power level and beam focus was used for its excitation. The improved array enhances the terahertz output power for use in extensive terahertz science and technology applications.

Abstract-High power T-ray generation using a new array of photoconductive antennas

Hamid Reza Zangeneh,  Farzad Moradiannejad


https://www.sciencedirect.com/science/article/pii/S1434841118334046

In this work, a new array of photoconductive antennas is proposed as a high power T-ray source. The array was modeled and simulated by the finite difference time domain method. The structure and characteristics of the T-ray source were studied. The potential advantages of the proposed array include enhanced efficiency of the broadband THz radiation and confined radiated THz pulse. Also, an asymmetry in the design of the array allows optimizing high optical-to-terahertz conversion efficiencies. These potential advantages of the proposed array can be exploited in satellite telecommunications such as geostationary terahertz satellite links. Moreover, the array is capable of employing radiation-band shaping technique for generation of tunable and narrow-band THz radiation.