Abstract/Details

Thermally stable materials for photonic band gap crystals


2006 2006

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Abstract (summary)

Colloidal microspheres can be used to "self-assemble" novel structures known as photonic band gap crystals. The optical properties of photonic band gap crystals can be manipulated by tailoring defects in these structures. Here we demonstrate a promising strategy to introduce defects without disturbing the lattice around the defects. We use multiphoton photopolymerization to draw patterns inside the photonic crystal. Because of the high temperature processing steps conventional organic photoresists are not suitable. Instead, we utilized methylsilsesquioxanes. Confocal and electron microscopies were then used to observe the patterned feature inside the 3-D structure.

We expand the scope of the use of these materials to multiphoton lithography that is a fast and easily controllable method to fabricate 3-D photonic crystals. Usage of thermally stable inorganic photoresists makes it possible to obtain photonic band gap crystals using this method. We present photonic band gap crystals using methylsilsesquioxane photoresists and multiphoton lithography. The structures maintain their shape without cracking even at the elevated temperatures necessary for further processing of the photonic crystal.

In addition, we address two problems in self-assembled photonic crystals. First, the growth of opals using large spheres (∼ 1 micron) is challenging because of their fast sedimentation. The mixture of water/n-propanol gives better control over the quality of opals. Second, cracks are generated during high temperature steps due to the shrinkage of silica spheres. We show how to avoid the formation of cracks using silica spheres preheated at high temperatures.

Indexing (details)


Subject
Materials science
Classification
0794: Materials science
Identifier / keyword
Applied sciences; Crystals; Direct laser writing; Laser writing; Photonic bandgap; Self-assembly; Thermally stable
Title
Thermally stable materials for photonic band gap crystals
Author
Jun, Yoonho
Number of pages
114
Publication year
2006
Degree date
2006
School code
0130
Source
DAI-B 67/09, Dissertation Abstracts International
Place of publication
Ann Arbor
Country of publication
United States
ISBN
9780542888809
Advisor
Norris, David J.
University/institution
University of Minnesota
University location
United States -- Minnesota
Degree
Ph.D.
Source type
Dissertations & Theses
Language
English
Document type
Dissertation/Thesis
Dissertation/thesis number
3234922
ProQuest document ID
305310212
Copyright
Database copyright ProQuest LLC; ProQuest does not claim copyright in the individual underlying works.
Document URL
http://search.proquest.com/docview/305310212
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