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Gap Maps for Triangular Photonic Crystals with a Dispersive and Absorbing Component
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.
2005 (English)In: Physical Review B. Condensed Matter and Materials Physics, ISSN 1098-0121, E-ISSN 1550-235X, Vol. 72, no 20, 205120- p.Article in journal (Refereed) Published
Abstract [en]

Some consequences of a strong lattice resonance in the working frequency region of a 2D photonic crystal are investigated. It opens for two kinds of gaps in the dispersion relations: structure gaps and a polaritonic gap. A transverse optical oscillator model for ceramic beryllium oxide has been used to simulate the dielectric function of the polaritonic medium. The effective index of refraction is different on either side of the resonance, which causes BeO to act both as a high index material and a low index material. Gap maps for two kinds of triangular structures were calculated: BeO cylinders in air or in a high-index, nondispersive dielectric. These gap maps show appearance and disappearance of the transverse electric, transverse magnetic, and complete structure gaps as function of the packing fraction r/a, and the lattice constant a. The results illustrate the importance of whether the dielectric or the polaritonic material has the higher effective dielectric function. The effects of absorption, included by the damping parameter of the oscillator model, are briefly discussed.

Place, publisher, year, edition, pages
2005. Vol. 72, no 20, 205120- p.
National Category
Engineering and Technology
Identifiers
URN: urn:nbn:se:uu:diva-93207DOI: 10.1103/PhysRevB.72.205120OAI: oai:DiVA.org:uu-93207DiVA: diva2:166616
Available from: 2005-05-13 Created: 2005-05-13 Last updated: 2014-01-28Bibliographically approved
In thesis
1. Numerical Studies of Energy Gaps in Photonic Crystals
Open this publication in new window or tab >>Numerical Studies of Energy Gaps in Photonic Crystals
2005 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

The concept of photonic crystals was born in the late 1980's when two important letters were published that showed the possibility to control light propagation by a periodic structure. A photonic crystals consists of two or more materials with different dielectric functions periodically arranged on the length scale of light. If the conditions are favorable, a gap will open in the dispersion relation, often called photonic band structure, and electromagnetic waves with frequency in the gap range cannot propagate through the photonic crystal.

In this thesis, mainly two types of structures and their properties have been numerically investigated: two-dimensional structures that are either square or triangular. In the calculations, both dielectric and polaritonic materials have been used. Polaritonic materials have an interval of high reflectance in the IR range, due to strong lattice resonances. Within such an interval, the real part of the dielectric function is negative, which causes a metal-like behavior. A polaritonic material, BeO has been introduced in photonic crystals to study the coexistence of structure and polaritonic gaps. Band structures and for some cases transmission spectra have been calculated to study the existence of complete gaps, i.e. energy intervals in which an incoming electromagnetic wave is totally reflected regardless of polarization and angle of incidence.

A brief discussion on signature management and thermal emission, and calculations for low-emittance coatings is included. It is shown that a 50-60µm layer of a 3D photonic crystal can be sufficient to achieve a thermal emittance of 20%.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2005. 83 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 67
Keyword
Materials science, photonic crystals, polaritonic, periodic structures, Reststrahlen, band structure, energy gap, Materialvetenskap
National Category
Materials Engineering
Identifiers
urn:nbn:se:uu:diva-5848 (URN)91-554-6284-7 (ISBN)
Public defence
2005-06-03, Häggsalen, Ångströmlaboratoriet, Lägerhyddsvägen, Uppsala, 09:30 (English)
Opponent
Supervisors
Available from: 2005-05-13 Created: 2005-05-13 Last updated: 2009-03-27Bibliographically approved

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Ribbing, Carl-Gustaf

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