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(a) Illustration of one unit cell of the mid-IR DFSS filter optimized by a GA to exhibit a single stop band at with polarization insensitivity and high angular stability. (b) FESEM of the fabricated DFSS showing the well defined features with vertical sidewalls. (c) Optical microscope image of freestanding DFSS filter mounted on an Al holder for IR characterization.
Transmission spectra of the DFSS filter for TE (red) and TM (black) polarizations at normal (solid) and 10° (dashed) incidence. (a) Simulated response for the designed filter having the dimensions given in Fig. 1. (b) Measured response of the fabricated filter shown in Fig. 1. (c) Adjusted simulated response for the actual fabricated layer thicknesses.
Electric field distribution (magnitude) within the DFSS structure at the resonance wavelength of . (a) In-plane view reveals an asymmetric field pattern, indicative of a guided resonance. (b) Cross-section shows strong field concentration in the high index features.
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