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We design and characterize mid-infrared guided mode resonance structures with nano-scale slots designed to strongly confine long-wavelength light to ultra-subwavelength volumes. Simulations show <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">~ 30 ×</tex> enhancement of electric field within the slots, tunable with incidence angle and slot size.
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Mansfield et al. (2025) studied this question.