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Photoconductive antenna (PCA) was fabricated on the GaAs/Sapphire substrate. Terahertz (THz) emission properties were studied using time-domain spectroscopy. The results indicated more efficient THz radiation from this PCA when comparing with the identical PCA fabricated on low-temperature grown GaAs.
Photoconductive antennas (PCA) (one of the most commonly used terahertz emitters) have limited performance (e.g. low output power) and as such, do not fully meet the increasing needs of applications. This work attempts to find a route to further improve the performance of PCA by studying the dependence of emission properties on various parameters. Using substrates of LT-GaAs and SI-GaAs, the responses...
In this work, butterfly shaped photoconductive antennas (PCAs) on low-temperature grown (LT) GaAs and semi-insulating (SI) GaAs substrate as terahertz (THz) emitters are experimentally characterized and compared. Dependences of the THz radiated field on the applied DC bias voltage and laser pump power are compared. Quadratic DC bias dependence is seen for SI-GaAs PCA compared to a linear dependence...
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