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Asymmetry-Enabled Dual-Resonant Mid-Infrared Absorption in Subwavelength Perforated Metal Structures
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DOI：10.1021/acs.nanolett.6c01942.png)
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Abstract
En 中文
The ability to engineer multiresonant absorption response in the midwave infrared provides spectral information critical for detection and sensing. We design and fabricate thin metal absorbers with a polarization-dependent, multiresonant, and spectral response. Our approach exploits the coexistence of a conventional Fabry-Peròt (FP) resonance and a geometry-enabled resonance arising from symmetry breaking within a single, dilute-metal structure. The resulting anisotropic geometry produces a polarization-dependent response with a single resonance for x-polarized light and dual resonances for the orthogonal polarization. The resonances correspond to two fundamentally distinct physical mechanisms (i.e., cavity- and symmetry-driven); we experimentally verify our findings and achieve dual-resonant thin metal structures. These findings are promising for independently tailoring spectral position and line width within a single compact structure.
Keywords:
Absorption
Infrared light
Metals
Metamaterials
Resonance structures
midwave infrared absorbers
polarization dependence
asymmetry-enabled resonances
multiresonant design
Journal
IF:
9.1
Papers:
2.7W
Citations:
16.5W
Organization
Cited Papers