Search for dissertations about: "geometric optics"
Showing result 1 - 5 of 15 swedish dissertations containing the words geometric optics.
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1. Multidimensional Constellation Shaping for Coherent Optical Communication Systems
Abstract : To overcome the increasing demands for Internet traffic, exploiting the available degrees of freedom in optical communication systems is necessary. In this thesis, we study how constellation shaping can be achieved in various dimensions and how various shaping schemes affect the whole performance in real systems. READ MORE
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2. Nanostructured electromagnetic metasurfaces at optical frequencies
Abstract : Electromagnetic metasurfaces are broadly defined as optically thin layersthat are structured on the subwavelength scale. In general, metasurfacesthus consist of nanoparticles, or other kinds of ”meta-atom”, arranged insome pattern where both the individual particle sizes and the inter-particledistances are much smaller than the wavelength. READ MORE
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3. Multicomponent Clusters/Nanoparticles : An Investigation of Electronic and Geometric Properties by Photoelectron Spectroscopy
Abstract : Clusters/nanoparticles are aggregates of a “small” number of building blocks, atoms or molecules, ranging from two up to millions of atoms. Two main groups of clusters have been studied using photoelectron spectroscopy based on synchrotron radiation. READ MORE
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4. A new laser-plasma X-ray source for microscopy and lithography
Abstract : A new high-brightness source for soft X-rays and EUV-radiation has been developed. This laser-plasma source utilizes a microscopic liquid droplet or jet as target. The result is a reduction of debris emission by several orders of magnitude compared to conventional laser plasmas. READ MORE
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5. Theoretical spectroscopic investigation of hybrid halide perovskite solar cell materials
Abstract : Perovskite solar cells have recently become a very promising candidate in the search for an effective solar cell material. Over the past 10 years, their power conversion efficiency has increased to over 25% and there is a wide range of different potential chemical makeups that provide a range of materials to investigate. READ MORE