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Sources over Layered Media of Metamaterials and Plasmon: Modes, Fields, and Subwavelength Image Enhancement Using Surface Roughness
Jeremy Quinn Bagley
Paperback. ProQuest, UMI Dissertation Publishing 2011-09-30.
ISBN 9781244630789
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Publisher description
This dissertation provides a study of electromagnetic fields, propagation of modes, and subwavelength image enhancement produced by surface roughness, due to excitations from sources on layered metamaterial and plasmon media.
Chapter 2 provides an investigation into the fields of a dipole in layered negative refractive index metamaterials using the fast all modes method and the numerical modified steepest-descent path method. All surface wave modes and leaky wave modes are found for lossless and lossy cases. A combination of forward and backward or even no surface wave modes may propagate at certain slab thicknesses, causing the fields vary significantly.
In Chapter 3 the fast all modes method and the numerical modified steepest-descent path method are extended into the optical frequency range by finding all modes and solving the electric field due to a dipole above a lossy plasmon film between two dielectric materials. Up to four proper surface wave modes may propagate, including backward and forward modes. Superlensing of the transmitted field is verified.
Chapter 4 provides a study of image enhancement of transmitted optical fields though plasmon films with smooth, random-rough, and sinusoidal-rough surfaces. Subwavelength roughness produces image enhancement by reducing the spatial width of the image. Images of multiple sources are enhanced, translational invariant for sub-wavelength spacing, and image quality is preserved. The method of moments (MoM), analytic small perturbation method (SPM), and T-matrix method are used to validate the theoretical results. SPM to arbitrary orders illustrates image enhancement effects in the spectral domain. Subwavelength roughness enhances images by suppression of the surface plasmon polaritons. Surface Roughness extends image enhancement to the far field.
Chapter 5 documents an approach using SPM to calculate the electromagnetic fields from point sources transmitted through rough-surface layered-media in 3D. Transmitted fields up to the fourth order of a dipole over a plasmon slab are calculated. Surface roughness in 3D causes the image spectrum to smoothen, as in the 2D case. This method calculates the fields without memory-intensive matrix inversion or time-consuming iterative methods. Results are validated using MoM.
Chapter 6 summarizes the major findings and conclusions from the work presented in this dissertation
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Sources over Layered Media of Metamaterials and Plasmon: Modes, Fields, and Subwavelength Image Enhancement Using Surface Roughness
Book reviews » Sources over Layered Media of Metamaterials and Plasmon: Modes, Fields, and Subwavelength Image Enhancement Using Surface Roughness
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