Fig. 2: Simulation of the photonic crystal (PhC) resonator.
From: 3D printed sub-terahertz photonic crystal for wireless passive biosensing
a Simulation of the resonator coupled with two PhC waveguides. The simulated electric field distribution is scaled in color. b The analyte under test (in red) is built on the wall of the slot. The adjacent holes around the slot are shifted to achieve a high quality factor (Q-factor). In our design, the first three adjacent holes along the resonator are shifted towards the outside with a displacement of \({x}_{1}=223\;{\mu m}\), \({x}_{2}=107\;{\mu m}\), and \({x}_{3}=107\;{\mu m}\), respectively. The holes below and above the resonator are shifted towards the outside with a displacement of \({y}_{1}=178\;{\mu m}\), \({y}_{2}=154\;{\mu m}\), and \({y}_{3}=130\;{\mu m}\), respectively. The optimized slot width is \(w=244.5\;{{{{{\rm{\mu m}}}}}}\). c The simulated transmission parameter S21 and reflection parameter S11 of the resonators with the hole radius \({{{{{\rm{r}}}}}}=0.30p\) and \({{{{{\rm{r}}}}}}=0.27p\) (\(p\) is the lattice period), respectively.
