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Methodological notes


Angular beam width of a slit-diffracted wave with noncollinear group and phase velocities


Institute of Radio Engineering and Electronics, Russian Academy of Sciences, pl. Vvedenskogo 1, Fryazino, Moscow Region, 141120, Russian Federation

Taking magnetostatic surface wave diffraction as an example, this paper theoretically investigates the 2D diffraction pattern arising in the far-field region of a ferrite slab in the case of a plane wave with noncollinear group and phase velocities incident on a wide, arbitrarily oriented slit in an opaque screen. A universal analytical formula for the angular width of a diffracted beam is derived, which is valid for magnetostatic and other types of waves in anisotropic media and structures (including metamaterials) in 2D geometries. It is shown that the angular width of a diffracted beam in an anisotropic medium can not only take values greater or less than $\lambda_0/D$ (where $\lambda_0$ is the incident wavelength, and $D$ is the slit width), but can also be zero under certain conditions.

Text can be downloaded in Russian. English translation is available on IOP Science.
PACS: 41.20.Gz, 41.20.Jb, 42.25.Fx, 75.70.−i (all)
DOI: 10.3367/UFNe.0182.201212e.1327
URL: https://ufn.ru/en/articles/2012/12/e/
Citation: Lock E H "Angular beam width of a slit-diffracted wave with noncollinear group and phase velocities" Phys. Usp. 55 1239–1254 (2012)
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Received: 4th, April 2011, revised: 5th, September 2011, 4th, October 2011

Оригинал: Локк Э Г «Угловая ширина луча при дифракции на щели волны с неколлинеарными групповой и фазовой скоростями» УФН 182 1327–1343 (2012); DOI: 10.3367/UFNr.0182.201212e.1327

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