Abstract
We have fabricated Jesus-cross structure on aluminum foil by using the femtosecond laser technique. By using 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 by using 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 1.5×1.5cm2. The resonant frequencies of the proposed structure are 0.216THz and 0.735THz with 3-dB bandwidths of 62GHz and 15GHz, 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.
Highlights
Nowadays, terahertz (THz) wave has attracted widespread concern due to its unique applications such as wireless communication, imaging, security, etc
The array of crossing fractal structures is fabricated on aluminum foil with a conductivity of 3.56 × 107 S/m
For the crossing fractal-air-crossing fractal structure, one can see that the first resonant central frequency is 0.24 THz with transmittance of 0.96
Summary
Terahertz (THz) wave has attracted widespread concern due to its unique applications such as wireless communication, imaging, security, etc. The array of crossing fractal structures is fabricated on aluminum foil with a conductivity of 3.56 × 107 S/m. The optimized dimensions of the crossing fractal structure are as follows: a = 500 μm, aluminum foil thickness of 10 μm, t = 45 μm, h = 480 μm, s = 135 μm, and g = 30 μm.
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