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Realization of Selective Low Emittance in Both Thermal Atmospheric Windows
Uppsala University, Teknisk-naturvetenskapliga vetenskapsområdet, Technology, Department of Engineering Sciences.
2005 In: Optical Engineering, Vol. 44, no 2, 026001- p.Article in journal (Refereed) Published
Place, publisher, year, edition, pages
2005. Vol. 44, no 2, 026001- p.
URN: urn:nbn:se:uu:diva-94545OAI: oai:DiVA.org:uu-94545DiVA: diva2:168426
Available from: 2006-04-28 Created: 2006-04-28Bibliographically approved
In thesis
1. Optical Studies of Periodic Microstructures in Polar Materials
Open this publication in new window or tab >>Optical Studies of Periodic Microstructures in Polar Materials
2006 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The optical properties of matter are determined by the coupling of the incident electromagnetic radiation to oscillators within the material. The oscillators can be electrons, ions or molecules. Close to a resonance the dielectric function exhibits strong dispersion and may be negative. A negative dielectric function gives rise to a complex wave vector which is associated with no allowed states for photons, i.e. high extinction and bulk reflectance, as well as the possibility to support surface waves.

It is possible to manufacture a dielectric material that generates a complex wave vector. Such materials are called photonic crystals and they may exhibit a frequency range without allowed states for photons, i.e. an energy gap. A photonic crystal has a periodically varying dielectric function and the lattice constant is of the same order of magnitude as the wavelengths of the gap.

In this thesis, two optical phenomena causing a complex wave vector are combined. Polar materials, which have lattice resonance in the thermal infrared causing strong dispersion, are studied in combination with a periodic structure. The periodicity introduced is achieved using another material, but also by structuring of the polar material. One, two and three dimensional structures are considered. The polar materials used are silicon dioxide and silicon carbide. It is shown, both by calculations and experiments that the two optical phenomena can co-exist and interact, both constructively and destructively. A possible application for the combination of the two phenomena is discussed: Selective emittance in the thermal infrared. It is also shown that a polar material can be periodically structured by a focused ion beam in such way that it excites surface waves.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2006. 69 p.
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 189
Engineering physics, polaritonic, polar, photonic crystal, surface phonon polariton, multilayer, Reststrahlen, SiC, SiO2, Teknisk fysik
urn:nbn:se:uu:diva-6896 (URN)91-554-6578-1 (ISBN)
Public defence
2006-05-24, Siegbahnsalen, Ångströmlaboratoriet, Ångströml Lägerhyddsvägen 1, Uppsala, 09:30
Available from: 2006-04-28 Created: 2006-04-28 Last updated: 2011-04-07Bibliographically approved

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