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  • Letter
  • Open Access

Maximal violation of Kirchhoff's law in planar heterostructures

Lu Wang (汪璐)1, F. Javier García de Abajo1,2, and Georgia T. Papadakis1,*

  • 1ICFO-Institut de Ciencies Fotoniques, The Barcelona Institute of Science and Technology, 08860 Castelldefels (Barcelona), Spain
  • 2ICREA-Institució Catalana de Recerca i Estudis Avançats, Passeig Lluís Companys 23, 08010 Barcelona, Spain

  • *georgia.papadakis@icfo.eu

Phys. Rev. Research 5, L022051 – Published 7 June, 2023

DOI: https://doi.org/10.1103/PhysRevResearch.5.L022051

Abstract

Violating Kirchhoff's law is generally achieved using patterned nonreciprocal materials, where a guided or polaritonic mode that lies outside the light cone, often via gratings, is excited. Here, we describe how nonreciprocity manifests itself in pattern-free heterostructures. We demonstrate that a resonant mode in a dielectric spacer separating a nonreciprocal film from a back reflector suffices to maximally violate Kirchhoff's law, and identify the minimal dielectric requirements for such functionality, which are satisfied by currently available materials.

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