Terahertz Transmission Characteristics of Free-Standing Fractal Jesus-Cross Structure

Abstract

We have fabricated a Jesus-cross structure on aluminum foil using the femtosecond laser technique. Using the terahertz time-domain spectroscopy (THz-TDS) system, the transmission properties of free-standing double-layer crossing fractal structure are tested. The parameters of the proposed structure were optimized using the finite element frequency domain technology of commercial software CST Microwave Studio package. The dimensions of the aluminum foil periodically patterned with crossing fractal structure are 1.5 × 1.5 cm 2 . The resonant frequencies of the proposed structure are 0.216 and 0.735 THz with 3-dB bandwidths of 62 and 15 GHz, respectively. The transmission ratio can reach to 0.89 and 0.57. It indicates the structure having dual-band filtering performance. This work has the potential to open a new avenue as a filter working for free-space terahertz radiation.

Design, simulation and fabrication of a new terahertz cross-shaped metamaterial bandpass filter to obtain a narrow frequency bandwidth

“…Another new type of structure is designed for the terahertz bandpass metamaterials in Jesus cross structure [8]. It has a transfer coefficient of 57% to 89%, which is lower than that of a cross-shaped structure (Table 1).…”

“…It has a transfer coefficient of 57% to 89%, which is lower than that of a cross-shaped structure (Table 1). These types of structures have been simulated using the CST STUDIO software and compared with experimental results; they have proved to provide very similar results [8].…”