Forcella Davide, Prada Claire, Carminati Rémi
ESPCI Paris, PSL Research University, CNRS, Institut Langevin, 1 rue Jussieu, F-75005 Paris, France.
Phys Rev Lett. 2017 Mar 31;118(13):134301. doi: 10.1103/PhysRevLett.118.134301.
The importance of spatial nonlocality in the description of negative refraction in electromagnetic materials has been put forward recently. We develop a theory of negative refraction in homogeneous and isotropic media, based on first principles, and that includes nonlocality in its full generality. The theory shows that both dissipation and spatial nonlocality are necessary conditions for the existence of negative refraction. It also provides a sufficient condition in materials with weak spatial nonlocality. These fundamental results should have broad implications in the theoretical and practical analyses of negative refraction of electromagnetic and other kinds of waves.
空间非局域性在电磁材料中负折射描述方面的重要性最近已被提出。我们基于第一性原理，发展了一种关于均匀各向同性介质中负折射的理论，该理论全面涵盖了非局域性。该理论表明，耗散和空间非局域性都是负折射存在的必要条件。它还为具有弱空间非局域性的材料提供了一个充分条件。这些基本结果应在电磁波及其他类型波的负折射的理论和实际分析中具有广泛的意义。
