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Array truncation effects in infrared frequency selective surfaces
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DOI：10.1364/OE.22.016645.png)
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摘要
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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 mu m 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. (C) 2014 Optical Society of America
Keyword:
PHASE SINGULARITIES
OPTICAL-FIELDS
SCATTERING
PLANAR
WAVES
EMISSION
DIPOLE
ENERGY
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期刊
IF:
3.3
论文数:
6.1W
被引数:
14.3W
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引用论文
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