The effects of capillarity on photonic crystal selective emitters

Photonic crystals offer an unparalleled control over optical properties and are ideal candidates as high efficiency selective emitters. They are, however, known to degrade at elevated temperatures through a number of processes, with one of the most notable being surface evolution by capillary forces. By comprehensively simulating the morphological and optical effects of this phenomenon, in the form of surface diffusion, vapor transport, and grain boundary grooving, this thesis seeks to understand its consequences and attempts to pinpoint methodologies that may prevent it. It was shown that while grain boundary grooves have a negligible effect on photonic crystal structures, vapor transport and surface diffusion may be significant. Indeed, vapor transport was found to progressively reduce the dimensions of photonic crystal cavities, and thus slightly alter their optical properties. Conversely, surface diffusion gradually closed o these cavities, thereby eliminating coupling into their resonant modes, and eradicating their selective emission capabilities. Changes to the shape of these photonic crystal structures that decreased their curvature and removed discontinuities were found to be beneficial in inhibiting degradation by capillarity, and an optimized structure that displays both higher efficiency and greater stability over time was ultimately theorized.

Department dc:contributor.department

Massachusetts Institute of Technology. Department of Materials Science and Engineering.

Grantor dc:publisher

Massachusetts Institute of Technology

Year dc:date.issued

2014

Author dc:creator

• Peykov, Daniel

Advisor dc:contributor.advisor

• Christopher A. Schuh.

• Materials Science and Engineering.

Statement dc:rights

• M.I.T. theses are protected by copyright. They may be viewed from this source for any purpose, but reproduction or distribution in any format is prohibited without written permission. See provided URL for inquiries about permission.

Licence dc:rights.uri

• http://dspace.mit.edu/handle/1721.1/7582

Language dc:language.iso

eng

Handle dc:identifier.uri

http://hdl.handle.net/1721.1/92960

OAI identifier oai:identifier

oai:dspace.mit.edu:1721.1/92960