P08 – Tunable Guided-mode resonance filter using Spacetime Periodic Structure

We present a tunable planar guided-mode resonance (GMR) filter using time-varying permittivity along grating nanobars. Results show that the effective medium concept in the temporal state is exactly the same as the spatial state. Furthermore, the structure has spatial periodicity to save the resonance peak of the passive GMR in addition to the temporal periodicity that is used to tune the resonance location around the static reflection and transmission resonance peak as blueshift or redshift. Moreover, the proposed 1D+1 spacetime GMR filter has a broader bandwidth (BW) for blueshift in comparison to the redshift of the peak resonance.