Applied Physics B (Impact Factor: 1.86). 10/2010; 101(1):273-282. DOI: 10.1007/s00340-010-4012-z
We present a mathematical model and its numerical implementation for the analysis of the interaction of spatially partially
coherent electromagnetic fields with micro- and nanostructured objects. The model is based on the decomposition of the incident
field into a set of fully coherent but mutually uncorrelated elementary field modes, and the use of the Fourier Modal Method
(FMM) with the S-matrix propagation algorithm. We apply the model to studies of the excitation of surface plasmons in thin
metallic slabs, nanowires, and resonant structures. We demonstrate, e.g., that the plasmon excitation efficiency is not essentially
affected by the degree of spatial coherence. However, certain plasmon interference effects can be efficiently smoothed out
by using illumination with reduced coherence.
[Show abstract][Hide abstract] ABSTRACT: We have directly observed the interference ripple pattern between surface plasmon far field by gold nanosphere and the incident laser on silicon substrate. We explained the ripple formation using three-dimensional finite-difference time-domain simulation method. Nanosphere is an origin for regular ripple formation due to Mie scattering. We present a new method to control the plasmonic far-field pattern using an arbitrary gold nanostructure on the silicon substrate. Previously, the formed ripples were not regular but wavy because they were formed incoherently through the self organization process originating from the random surface roughness. The ripple structure was well controlled coherently. (C) 2011 American Institute of Physics. [doi:10.1063/1.3624925]
[Show abstract][Hide abstract] ABSTRACT: We present experimental and theoretical results on plasmonic control of far-field interference for regular ripple formation on semiconductor and metal. Experimental observation of interference ripple pattern on Si substrate originating from the gold nanosphere irradiated by femtosecond laser is presented. Gold nanosphere is found to be an origin for ripple formation. Arbitrary intensity ripple patterns are theoretically controllable by depositing desired plasmonic and Mie scattering far-field pattern generators. The plasmonic far-field generation is demonstrated not only by metallic nanostructures but also by the controlled surface structures such as ridge and trench structures on various material substrates.
[Show abstract][Hide abstract] ABSTRACT: We study the coherence changes in partially coherent beams transmitted through binary metallic gratings. The interaction of Gaussian Schell-model beams with grating structures supporting surface plasmons is rigorously modeled using the Fourier modal method and the coherent mode representation of partially coherent fields. Our numerical results show that, by choosing suitable parameters for the grating, the degree of coherence of the beam can be significantly increased. The studied approach offers new possibilities to alter the coherence properties of fields using nanophotonic components.
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