Searched for: department%3A%22Telecommunications%22
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Raghunathan, S.B. (author)
doctoral thesis 2013
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Raghunathan, S.B. (author), Schouten, H.F. (author), Visser, T.D. (author)
We demonstrate that coherence vortices, singularities of the correlation function, generally occur in partially coherent electromagnetic beams. In successive cross sections of Gaussian Schell-model beams, their locus is found to be a closed string. These coherence singularities have implications for both interference experiments and correlation...
journal article 2012
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Raghunathan, S.B. (author), Gan, C.H. (author), Van Dijk, T. (author), Ea Kim, B. (author), Schouten, H.F. (author), Ubachs, W. (author), Lalanne, P. (author), Visser, T.D. (author)
We report a plasmon steering method that enables us to dynamically control the direction of surface plasmons generated by a two-mode slit in a thin metal film. By varying the phase between different coherent beams that are incident on the slit, individual waveguide modes are excited. Different linear combinations of the two modes lead to...
journal article 2012
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Raghunathan, S.B. (author), Van Dijk, T. (author), Peterman, E.J.G. (author), Visser, T.D. (author)
In trying to manipulate the intensity distribution of a focused field, one typically uses amplitude or phase masks. Here we explore an approach, namely, varying the state of spatial coherence of the incident field. We experimentally demonstrate that the focusing of a Bessel-correlated beam produces an intensity minimum at the geometric focus...
journal article 2010
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Raghunathan, S.B. (author), Budko, N.V. (author)
A generalization of the S-parameter retrieval method for finite three-dimensional inhomogeneous objects under arbitrary illumination and observation conditions is presented. The effective permittivity of such objects may be rigorously defined as a solution of a nonlinear inverse scattering problem. We confirm analytically and observe numerically...
journal article 2010
Searched for: department%3A%22Telecommunications%22
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