Abstract
A new theoretical approach towards the exact identification of the output reflected beam position by the effect of spatial Goos-Hanchen (GH) shift and Imbert-Fedorov (IF) shift using Gaussian beam, Laguerre-Gaussian beam and Bessel beam are observed, designed and simulated with the three layered Kretschmann geometry at a free space wavelength of 1550 nm, where the proposed configuration comprising a BK7 prism (n=1.5007) and a 50 nm thin metal layer of silver (n= 0.4096+10.048i). To the best of our knowledge several articles have been discussed, separately considering the Gaussian beam, Laguerre-Gaussian beam and Bessel beam in which without the composite effect of spatial GH shift and IF shift whereas the exact beam position can only be identified with the effect of these shifts. In our proposed configuration by varying incident angle through Bessel beam, the observed spatial GH shift is tuned from 44.267 µm to 0.261 µm and the spatial IF shift is tuned from 39.301 µm to -13.024 µm. With the same variation of incident angle, the spatial GH shift and IF shift are also observed for Gaussian beam and as well as for Laguerre Gaussian beam. This new idea explores the accurate tuning of output beam position with varying incident angle which expedites the path of fine tuning in optical switching within µm ranges.
Published Version
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