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We describe a scheme for far-field subwavelength fingerprinting in the mid-IR and THz bands. The approach relies on evanescent wave retrieval, mediated by scattering on a subwavelength nanostructure.
We map out a transition from polycrystalline to amorphous photonic structures with decreasing short-range order. The photonic band gap decreases once the individual domains of ordered structure become too small for the gap formation.
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