title: Tunable and polarization-selective THz range transmission properties of metallic rectangular array with a varying hole channel shape.
abstract: This paper proposes a metallic hole array of a rectangular converging-diverging channel (RCDC) shape with extraordinary transmission. We use a three-dimensional (3D) finite element method to analyze the transmission characteristics of two-dimensional metallic hole arrays (2D-MHA) with RCDC. For a straight channel MHA, when the aperture size is reduced, the transmission peaks have a blue-shift. The same result is observed for a smaller gap throat for the RCDC structure. For the rectangular holes with a high length-width ratio, a similar blue-shift in the transmission peaks as well as a narrower full width at half maximum (FWHM) are observed. The asymmetry from the rectangular shape gives this structure high selectivity for light with different polarizations. Furthermore, the RCDC shape gives extra degrees of geometrical variables to 2D-MHA for tuning the location of the transmission peak and the FWHM. The tunable transmission property of this structure shows promise for applications in tunable filters, photonic circuits, and biosensors.
authors.affiliation: Mechanical Engineering Department, The University of Texas at Austin, Austin, TX 78712, USA.
authors.forename: Wei
authors.initials: W
authors.lastname: Wang
authors.forename: Yalin
authors.initials: Y
authors.lastname: Lu
authors.forename: R J
authors.initials: RJ
authors.lastname: Knize
authors.forename: Kitt
authors.initials: K
authors.lastname: Reinhardt
authors.forename: Shaochen
authors.initials: S
authors.lastname: Chen
mesh_terms: D017076:Computer-Aided Design; D004867:Equipment Design; D019544:Equipment Failure Analysis; D008027:Light; D008670:Metals / Q000737:chemistry*; D012031:Refractometry / Q000295:instrumentation* / Q000379:methods; D015203:Reproducibility of Results; D012542:Scattering, Radiation; D012680:Sensitivity and Specificity; D055053:Terahertz Radiation
chemical_list: D008670:Metals