Abstract

An ultrathin, flexible metamaterial filter operated at terahertz (THz) frequencies based on one-step ${{\rm{CO}}_2}$ laser-induced graphene (LIG) is proposed. The effects of laser machining parameters on conductivity and THz transmittance of the LIG are investigated, and a bandstop filter is fabricated from an ${\sim}{{50}} \;{{\unicode{x00B5}{\rm m}}}$ polyimide film using the LIG method with relatively high laser power and scanning speed. At a blocking central frequency of 0.67 THz, the planar filter transmission is ${\sim}{{40}}\%$ with only small variations for different bending angles. The simple, low-cost LIG method enables fabrication of THz metamaterial devices with great potential for THz imaging, sensing, and detection.

© 2022 Optica Publishing Group

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