We numerically investigated the asymmetric spectral emissivity in the mid- to long-infrared range of a metamaterial composed by subwavelength oriented air inclusions into a polar (SiC) matrix. The longitudinal phononic resonance can be excited and tuned as a function of the inclusions content and orientation, within the application limits of the effective medium homogenization technique. Furthermore, our numerical results show that it is possible to enhance the emissivity in a given direction rather than in the opposite one by continuously varying the inclusions filling factor along the film thickness. As an example, we design a graded air inclusion pattern starting from a few microns thick SiC layer. We show that a strongly asymmetric (forward vs. backward) emission along the normal direction to the surface can be achieved.

Asymmetric and tunable infrared emission in metamaterials composed by oriented air voids into a polar material / Larciprete, Maria Cristina; Centini, Marco; Li Voti, Roberto; Sibilia, Concita. - In: JOURNAL OF MODERN OPTICS. - ISSN 0950-0340. - ELETTRONICO. - 66:3(2019), pp. 299-303. [10.1080/09500340.2018.1520933]

Asymmetric and tunable infrared emission in metamaterials composed by oriented air voids into a polar material

Larciprete, Maria Cristina
;
Centini, Marco;Li Voti, Roberto;Sibilia, Concita
2019

Abstract

We numerically investigated the asymmetric spectral emissivity in the mid- to long-infrared range of a metamaterial composed by subwavelength oriented air inclusions into a polar (SiC) matrix. The longitudinal phononic resonance can be excited and tuned as a function of the inclusions content and orientation, within the application limits of the effective medium homogenization technique. Furthermore, our numerical results show that it is possible to enhance the emissivity in a given direction rather than in the opposite one by continuously varying the inclusions filling factor along the film thickness. As an example, we design a graded air inclusion pattern starting from a few microns thick SiC layer. We show that a strongly asymmetric (forward vs. backward) emission along the normal direction to the surface can be achieved.
2019
Metamaterials, polaritons, infrared emissivity.
01 Pubblicazione su rivista::01a Articolo in rivista
Asymmetric and tunable infrared emission in metamaterials composed by oriented air voids into a polar material / Larciprete, Maria Cristina; Centini, Marco; Li Voti, Roberto; Sibilia, Concita. - In: JOURNAL OF MODERN OPTICS. - ISSN 0950-0340. - ELETTRONICO. - 66:3(2019), pp. 299-303. [10.1080/09500340.2018.1520933]
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11573/1151090
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