title: Array truncation effects in infrared frequency selective surfaces.
abstract: A metasurface consisting of an infinite array of square loops was designed for maximal absorptivity for s-polarized light at a wavelength of 10.6 µm and 60 degrees off-normal. We investigate the effects of array truncation in finite arrays of this design using far-field FTIR spectroscopy and scattering scanning near-field optical microscopy. The far-field spectra are observed to blue-shift with decreasing array size. The near-field images show a corresponding decrease in uniformity of the local electric field amplitude and phase spatial distributions. Simulations of the far-field absorption spectra and local electric field are consistent with the measured results.
authors: Jeffrey
authors: J
authors: D' Archangel
authors: Eric
authors: E
authors: Tucker
authors: Markus B
authors: MB
authors: Raschke
authors: Glenn
authors: G
authors: Boreman