Terahertz Metamaterial Filter Based on Laser-Induced Graphene

In this study, a terahertz metamaterial filter based on laser-induced graphene (LIG) is proposed. The electrical properties of the LIG under different laser parameters are investigated, and the transmission performance of the filter is measured using terahertz time-domain spectroscopy. The transmittance of the filter is 74. 2% at 0. 55 THz when the period of the filter unit is 500 mu m. By changing the period of the filter, the center frequency can be increased to 0. 65 THz. Furthermore, the characteristic of the filter amplitude is polarization-dependent. As the angle theta between the polarization direction of the incident terahertz waves and the x-axis increases, the transmittance of the filter decreases gradually. This simple and low-cost LIG method is expected to be used to prepare various terahertz metamaterial devices, which can be applied in many fields such as terahertz sensing, detection, and communication.