Phase response of cut-off metallic hole arrays

The paper presents numerical and experimental studies of the phase of the millimeter wave transmission response of a metal plate perforated by an array of subwavelength holes as a complimentary extension of our earlier results for the magnitude of the transmission response exhibiting extraordinary transmission properties (Gomez Rivas, J. et al., Phys. Rev. B, vol.68, art.201306(R), 2003). For the experimental study, prototypes were fabricated in aluminum plates and phase measurements were performed using a millimeter wave quasioptical vector network analyzer. For the numerical study, it was assumed that the structure was infinitely periodic. The experimental results match well the numerical predictions. It was demonstrated that the transmission response phase behavior is governed by resonant and Rayleigh Wood anomalies. Currently, ongoing studies target optimization of the transmission response by properly choosing the plate size and thickness, and incorporating layered media environments. Applications to frequency selective surfaces and other quasioptical structures are anticipated.