THz sensing with classical FSS

In this work a classical frequency selective surface is proposed for sensing applications at the terahertz regime. We design and experimentally test a FSS operating near 0.8 THz based on a cross-dipole periodic structure laying on a thin polypropylene substrate. A good sensing capability is tested by depositing a dielectric layer on the FSS, reaching a sensitivity up to 20%. Finally, an application towards the detection of microorganisms is proposed by means of a numerical study, demonstrating the potential of the technique in biomedical applications.