Lithography-free directional control of thermal emission

Abstract: Blackbody radiation is incoherent and omnidirectional, whereas various novel applications in renewable energy require a degree of directional control of a thermally emitted beam. So far, such directional control has required nano-structuring the surface of a thermally emitting material, typically by forming diffraction gratings. This, however, necessitates lithography and usually results in polarization-dependent properties. Here, we derive analytical conditions for highly directional thermal emission using a planar 3-layer structure analogous to a Salisbury screen. We present design rules for maximizing the directionality of such structures. Notably, these design rules pertain to both linear polarizations, thus generalizing the principles of a grating for unpolarized light. We show that the key requirement to achieve such performance is ultra-high quality factor resonances in materials supporting phonon polaritonic modes, as those found in low-dimensional materials. We propose a realistic device based on hexagonal Boron Nitride and predict performances comparable to lithography-based nano-structures.

Objekt anzeigen

• Standort: Deutsche Nationalbibliothek Frankfurt am Main
• Umfang: Online-Ressource
• Sprache: Englisch

Verweise und Beziehungen

• Erschienen in: Lithography-free directional control of thermal emission ; volume:13 ; number:5 ; year:2024 ; pages:763-771 ; extent:9 ; Nanophotonics ; 13, Heft 5 (2024), 763-771 (gesamt 9)

Beteiligte, Orts- und Zeitangaben

• Urheber: Sarkar, Mitradeep ; Giteau, Maxime ; Enders, Michael T. ; Papadakis, Georgia T.

Weitere Informationen

• DOI: 10.1515/nanoph-2023-0595
• URN: urn:nbn:de:101:1-2024031214421243014982
• Rechteinformation: Open Access; Der Zugriff auf das Objekt ist unbeschränkt möglich.