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On the angular dependence of gaps in 1-D Si/SiO2 periodic structures
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Technology, Department of Engineering Sciences, Solid State Physics.
2007 (English)In: Optics Communications, ISSN 0030-4018, E-ISSN 1873-0310, Vol. 271, no 1, 148-153 p.Article in journal (Refereed) Published
Abstract [en]

A multilayer of silicon and silicon dioxide was used to study the angular dependence of reflectance maxima originating from interference and bulk optical properties. Silicon dioxide has a lattice resonance in the infrared causing an interval of high reflectance for wavelengths around 9 μm. The multilayer was designed such that the interference maxima do not overlap/interact with the material related reflectance maximum. In this way the different angular behavior for the two types of reflectance maxima can be studied simultaneously. Experimental and calculated reflectance spectra for s- and p-polarized light for angles of incidence between 0° and 90° collected for every 5° are presented. The reflectance features caused by interference generally move to shorter wavelengths with increasing angle of incidence, and the materials related peak is widened for (s-polarized light) and excitation of the longitudinal modes was observed for p-polarized light.

Place, publisher, year, edition, pages
2007. Vol. 271, no 1, 148-153 p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-94546DOI: 10.1016/j.optcom.2006.10.083ISI: 000243984800025OAI: oai:DiVA.org:uu-94546DiVA: diva2:168427
Available from: 2006-04-28 Created: 2006-04-28 Last updated: 2017-12-14Bibliographically 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.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 189
Keyword
Engineering physics, polaritonic, polar, photonic crystal, surface phonon polariton, multilayer, Reststrahlen, SiC, SiO2, Teknisk fysik
Identifiers
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
Opponent
Supervisors
Available from: 2006-04-28 Created: 2006-04-28 Last updated: 2011-04-07Bibliographically approved

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Högström, HermanRibbing, Carl Gustaf

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