Log-Periodic Circular Tooth Antenna Enhancing Terahertz Absorption for Graphene Detector

Log-periodic circular tooth antenna is modeled and simulated to enhance absorption for graphene detector in terahertz frequency. S parameter is primarily extracted from isolated antenna, showing a uniform radiation feature. A frequency-dependent voltage collected by a monitor set over graphene sheet under terahertz illumination is detected and compared with that of the condition without an antenna. Voltage curve versus frequency matches the corresponding S parameter of the log-periodic circular tooth antenna over a wide range from 0.2THz to 1THz, conforming the absorption assistance effect of the antenna.