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Thermal emission control with period...

University of Minnesota., Chemical Engineering.

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Thermal emission control with periodic microstructures.

Record Type:	Electronic resources : Monograph/item
Title/Author:	Thermal emission control with periodic microstructures./
Author:	Han, Sang Eon.
Description:	160 p.
Notes:	Adviser: David J. Norris.
Contained By:	Dissertation Abstracts International70-02B.
Subject:	Engineering, Chemical. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3344688
ISBN:	9781109032956

Thermal emission control with periodic microstructures.
Han, Sang Eon.

Thermal emission control with periodic microstructures. - 160 p.

Adviser: David J. Norris.

Thesis (Ph.D.)--University of Minnesota, 2009.

In this thesis, the control of thermal emission with periodic microstructures is investigated. An important class of these structures, known as photonic crystals, are considered and Kirchhoff's law for photonic crystal films is discussed. Using fluctuational electrodynamics and a Green's function formalism, it is proved that Kirchhoff's law is obeyed for any photonic crystal films. This formalism allows the calculation of optical coherence for periodic structures. Moreover, a generalized form of Kirchhoff's law is derived for non-uniform temperatures. Using this, the control of thermal emission by selective heating of periodic structures is explored. It is found that local periodic heating allows control over which peaks appear in the thermal emission spectrum. The modification of thermal emission using a self-assembled metallic photonic crystal called inverse opal is also discussed. Despite its simplicity in fabrication, strong absorption in inverse opals prevents any influence of the periodicity. The origin of this effect is considered and it is shown how to tailor both the absorption and the surface coupling in experimentally realizable metallic inverse opals. The results show that the optical properties of tailored tungsten inverse opals can be similar to the tungsten woodpile, where modified thermal emission is already seen. In addition to these structures, structured metal surfaces, which are even easier to fabricate, are discussed. In particular, thermal emission from the surfaces of metal films that are patterned with a series of circular concentric grooves (a bull's eye pattern) is examined. Due to thermal excitation of surface polaritons, theory predicts that a single beam of light can be emitted from these films in the normal direction that is amazingly narrow, both in terms of its spectrum and its angular divergence. Experiments of tungsten bull's eyes verify this effect in the infrared. This shows that metallic films can generate laser-like beams of infrared light by a simple thermal process.

ISBN: 9781109032956Subjects--Topical Terms:

1018531
Engineering, Chemical.

Thermal emission control with periodic microstructures.
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005 20101104
008 101104s2009 ||||||||||||||||| ||eng d
020 $a 9781109032956
035 $a (UMI)AAI3344688
035 $a AAI3344688
040 $a UMI $c UMI
100 1 $a Han, Sang Eon. $3 1064654
245 1 0 $a Thermal emission control with periodic microstructures.
300 $a 160 p.
500 $a Adviser: David J. Norris.
500 $a Source: Dissertation Abstracts International, Volume: 70-02, Section: B, page: 1177.
502 $a Thesis (Ph.D.)--University of Minnesota, 2009.
520 $a In this thesis, the control of thermal emission with periodic microstructures is investigated. An important class of these structures, known as photonic crystals, are considered and Kirchhoff's law for photonic crystal films is discussed. Using fluctuational electrodynamics and a Green's function formalism, it is proved that Kirchhoff's law is obeyed for any photonic crystal films. This formalism allows the calculation of optical coherence for periodic structures. Moreover, a generalized form of Kirchhoff's law is derived for non-uniform temperatures. Using this, the control of thermal emission by selective heating of periodic structures is explored. It is found that local periodic heating allows control over which peaks appear in the thermal emission spectrum. The modification of thermal emission using a self-assembled metallic photonic crystal called inverse opal is also discussed. Despite its simplicity in fabrication, strong absorption in inverse opals prevents any influence of the periodicity. The origin of this effect is considered and it is shown how to tailor both the absorption and the surface coupling in experimentally realizable metallic inverse opals. The results show that the optical properties of tailored tungsten inverse opals can be similar to the tungsten woodpile, where modified thermal emission is already seen. In addition to these structures, structured metal surfaces, which are even easier to fabricate, are discussed. In particular, thermal emission from the surfaces of metal films that are patterned with a series of circular concentric grooves (a bull's eye pattern) is examined. Due to thermal excitation of surface polaritons, theory predicts that a single beam of light can be emitted from these films in the normal direction that is amazingly narrow, both in terms of its spectrum and its angular divergence. Experiments of tungsten bull's eyes verify this effect in the infrared. This shows that metallic films can generate laser-like beams of infrared light by a simple thermal process.
590 $a School code: 0130.
650 4 $a Engineering, Chemical. $3 1018531
650 4 $a Physics, Condensed Matter. $3 1018743
650 4 $a Physics, Radiation. $3 1019212
690 $a 0542
690 $a 0611
690 $a 0756
710 2 $a University of Minnesota. $b Chemical Engineering. $3 1021870
773 0 $t Dissertation Abstracts International $g 70-02B.
790 $a 0130
790 1 0 $a Aydil, Eray $e committee member
790 1 0 $a Frisbie, Daniel C. $e committee member
790 1 0 $a Norris, David J. $e committee member
790 1 0 $a Norris, David J., $e advisor
790 1 0 $a Shklovskii, Boris I. $e committee member
791 $a Ph.D.
792 $a 2009
856 4 0 $u http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3344688