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Calculated Photonic Structures for Infrared Emittance Control
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.
2002 (English)In: Applied Optics, ISSN 1559-128X, E-ISSN 2155-3165, Vol. 41, no 16, 3327-3331 p.Article in journal (Refereed) Published
Abstract [en]

Using an available program package based on the transfer-matrix method, we calculated the photonic band structure for two different structures: a quasi-three-dimensional crystal of square air rods in a high-index matrix and an opal structure of high-index spheres in a matrix of low index, ɛ = 1.5. The high index used is representative of gallium arsenide in the thermal infrared range. The geometric parameters of the rod dimension, sphere radius, and lattice constants were chosen to give total reflectance for normal incidence, i.e., minimum thermal emittance, in either one of the two infrared atmospheric windows. For these four photonic crystals, the bulk reflectance spectra and the wavelength-averaged thermal emittance as a function of crystal thickness were calculated. The results reveal that potentially useful thermal signature suppression is obtained for crystals as thin as 20–50 μm, i.e., comparable with that of a paint layer.

Place, publisher, year, edition, pages
2002. Vol. 41, no 16, 3327-3331 p.
National Category
Materials Engineering
Identifiers
URN: urn:nbn:se:uu:diva-93204DOI: 10.1364/AO.41.003327OAI: oai:DiVA.org:uu-93204DiVA: diva2:166613
Available from: 2005-05-13 Created: 2005-05-13 Last updated: 2017-12-14Bibliographically 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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