196,124 research outputs found
Goos-Hänchen shift in a two-dimensional atomic crystal
No full textIt is widely known that the Goos-Hänchen shift in three dimensional materials is proportional to the wavelength of the incident light. In freestanding two-dimensional crystals instead, it is proportional to their surface susceptibility
Determination of the Optical Constants of Atomically Thin MoS2 by Spectroscopic Ellipsometry
No full textRadiation-reaction electromagnetic fields in metasurfaces, a complete description of their optical properties
No full textThis paper derives the macroscopic electric and magnetic fields and the surface susceptibilities for a metasurface, starting from the microscopic scatterer distribution. It is assumed that these scatterers behave as electric and magnetic dipoles under the influence of the incident radiation. Interestingly not only the retarded electromagnetic fields from oscillating dipoles are relevant to pass from the microscopic to the macroscopic representation, but the advanced fields must be considered too. It is found that the macroscopic fields are the sum of the incident fields plus the radiation-reaction fields acting on a single scatterer. Both the local fields and the radiation-reaction fields are necessary to fix the electric and magnetic surface susceptibilities
Radiation-reaction electromagnetic fields in metasurfaces
No full textI derive the optical response of a metasurface starting from the microscopic description. Surprisingly the advanced potential solutions of the inhomogeneous Maxwell's equations are necessary to compute the macroscopic fields
Observation of nonspecular effects for Gaussian Schell-model light beams
No full textWe investigate experimentally the role of spatial coherence on optical beam shifts. This topic has been the subject of recent theoretical debate. We consider Gaussian Schell-model beams, with different spatial degrees of coherence, reflected at an air-glass interface. We prove that the angular Goos-Hanchen and the angular Imbert-Fedorov effects are affected by the spatial degree of coherence of the incident beam, whereas, the spatial Goos-Hanchen effect does not depend on incoherence. Our data unambiguously resolve the theoretical debate in favor of one specific theory
Observation of nonspecular effects for Gaussian Schell-model light beams
No full textWe investigate experimentally the role of spatial coherence on optical beam shifts. This topic has been the subject of recent theoretical debate. We consider Gaussian Schell-model beams, with different spatial degrees of coherence, reflected at an air-glass interface. We prove that the angular Goos-Hänchen and the angular Imbert-Fedorov effects are affected by the spatial degree of coherence of the incident beam, whereas, the spatial Goos-Hänchen effect does not depend on incoherence. Our data unambiguously resolve the theoretical debate in favor of one specific theory. 2012 American Physical Society
Role of spatial coherence in the Goos-Hänchen shift
No full textAmongst the various nonspecular phenomena that affect the reflection of a beam of light by a smooth surface, the Goos-Hänchen (GH) shift is certainly the most investigated one. Experimental studies of this effect have been performed so far only with fully spatial coherent beams. © 2013 IEEE
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