The Impact of Structural Parameters of Split-Ring Resonators on the Terahertz Radiation Characteristics of Micro-Structured Photoconductive Antennas: A Simulation Study

Abstract

In this study, we have theoretically designed a micro-structured photoconductive antenna based on the combination of split-ring resonator (SRR) and dipole photoconductive antenna. Further, we have used numerical simulations to prove that the proposed antenna can enhance the terahertz radiation characteristics. According to the equivalent circuit model analysis, the terahertz radiation power and the resonance frequency of this antenna were found to be closely related with the structural parameters of the SRR. A numerical model was established to simulate the effect of the structural parameters of SRR on the terahertz radiation characteristics of the proposed antenna. The results indicated that an increase in the width and length of SRR caused an increase in the peak power intensity and a decrease in the resonance frequency. Moreover, as the gap width of SRR was increased, the peak power intensity was decreased and the resonance frequency was increased. Furthermore, the terahertz radiation power increased with increase in the gap width of antennas. Overall, we show that high-power terahertz radiation sources with specific frequency can be obtained by optimizing the structural parameters of SRR, and such sources are potentially useful in a variety of fields such as biomedicine, material analysis, and detection systems.

Interdigitated Photoconductive Antenna for Efficient Terahertz Generation and Detection

“…The performance of PCA gets affected by the geometry of the antenna, optical source, impedance matching. Some antenna structures like bow-tie PCA, dipole PCA, logarithmic spiral antenna, nanoplasmonic PCA [29], nanoantennas with plasmonic contact electrode gratings, Amplifier-driven large-area PCA, Schottky PCA, Four contact PCA, split ring resonators [30] etc., can be used as the terahertz sources and detectors. To enhance the performance of photoconductive antenna in THz radiation, the antenna structures can be optimized.…”

Enhancing directivity of terahertz photoconductive antennas using spoof surface plasmon structure

“…The horizonal modes further result in the reduction of vertical directivity of THz PCAs. Integrating microscale metamaterial resonators with PCAs provide feasible routes to suppress the TL electrode modes at specific frequencies, thus increasing directivities of PCAs in narrow bands [27][28][29][30][31][32].…”