Repän, Taavi

This thesis has been written in part of the DarkSILD project. Aim of the project (and the thesis) is to explore possibilites for superresolution imaging of weakly scattering objects in bioimaging applications, for example. The thesis contains results of theoretical analysis and numerical simulations, carried out by the finite-element package COMSOL Multiphysics. The first half of the thesis gives a comprehensive overview of hyperbolic metamaterials: how to describe wave propagation in such structures, how the metamaterial parameters affect wave propagation and behavior, and how to design hyperbolic metamaterials using metaldielectric multilayers. I also explore how such properties come into play when designing hyperlenses for superresolution imaging. The second part of the thesis covers results of the PhD project. I start by presenting the dark-field hyperlens, using the theory developed in the first part of the thesis to discuss design challenges of the darkfield design. The design is based on a metal-dielectric multilayer with realistic material parameters, although as I will discuss the dark-field operation creates several new challenges. Thesis continues with more theoretical work, covering magnetic darkfield hyperlenses. Here I show that by also incorporating negative permeability hyperbolic metamaterials we can avoid some of the challenges, that seriously hampered performance of the earlier design. Finally, I move from hyperbolic metamaterials to anisotropic interfaces, which support hyperbolic surface waves. This allows applying the magnetic hyperlens design in a more realistic setting, as surface waves can be engineered to offers similar propagation properties as magnetic metamaterials, without actually requiring magnetic material properties

Online Research Database In Technology

Dark-field hyperlens: High-contrast subwavelength imaging in optics and acoustics

http://orbit.dtu.dk/ws/files/180166680/thesis_print.pdf

Dark-field hyperlens: High-contrast subwavelength imaging in optics and acoustics

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Online Research Database In Technology