Anomalous phenomena and spectral tailoring in photonic crystals
Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2010.
| Main Author: | |
|---|---|
| Other Authors: | |
| Format: | Thesis |
| Language: | eng |
| Published: |
Massachusetts Institute of Technology
2012
|
| Subjects: | |
| Online Access: | http://hdl.handle.net/1721.1/68970 |
| _version_ | 1811087609531727872 |
|---|---|
| author | Ghebrebrhan, Michael |
| author2 | John D. Joannopoulos. |
| author_facet | John D. Joannopoulos. Ghebrebrhan, Michael |
| author_sort | Ghebrebrhan, Michael |
| collection | MIT |
| description | Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2010. |
| first_indexed | 2024-09-23T13:49:11Z |
| format | Thesis |
| id | mit-1721.1/68970 |
| institution | Massachusetts Institute of Technology |
| language | eng |
| last_indexed | 2024-09-23T13:49:11Z |
| publishDate | 2012 |
| publisher | Massachusetts Institute of Technology |
| record_format | dspace |
| spelling | mit-1721.1/689702019-04-12T09:39:34Z Anomalous phenomena and spectral tailoring in photonic crystals Ghebrebrhan, Michael John D. Joannopoulos. Massachusetts Institute of Technology. Dept. of Physics. Massachusetts Institute of Technology. Dept. of Physics. Physics. Thesis (Ph. D.)--Massachusetts Institute of Technology, Dept. of Physics, 2010. Cataloged from PDF version of thesis. Includes bibliographical references (p. 98-109). Photonic crystals are recently discovered meta-materials whose optical properties arise from periodic refractive index variations. In this thesis I examine various aspects of photonic crystals including a self-assembled photonic crystal, anomalous properties arising from periodicity, and tailoring absorption and emission spectra. Fabricating photonic crystals with the desired properties in the infrared and optical frequencies, including a complete photonic bandgap, is an experimental challenge. Self-assembly can provide a solution. In Chapter 2, I examine a new type of colloidal photonic crystal of tetrahedral building blocks in a fcc lattice that is found to possess a robust and complete bandgap. In Chapter 3, I explore the photonic states that exist around a zero-group velocity point. Motivated by negative refraction, a measure of the effective wavevector is constructed that distinguishes various types of zerogroup velocity modes. Around one type of zero-group velocity mode, an anomalous region of backward effective wavevector is found that enables superior light confining properties of a mirror-less cavity. In the last two chapters I look at the problem of efficiently converting radiant energy to electrical power. In Chapter 4, I explore the extent to which ID multi-layer thin films can enhance the short circuit current of a 2 [mu]-thick silicon solar cell. Though such cells are limited by their size, for two front-layers a relative boost of 45% is possible. Finally, in Chapter 5, motivated by the problem of low efficiency in thermophotovoltaics, I look at selective emissivity of a 2D metallic photonic crystal. A semi-analytical theory is developed using only the material dispersion and geometrical parameters. Applications of the selective emitter, including power generation and lighting, are discussed. by Michael Ghebrebrhan. Ph.D. 2012-01-30T17:06:48Z 2012-01-30T17:06:48Z 2010 2010 Thesis http://hdl.handle.net/1721.1/68970 773932883 eng 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. http://dspace.mit.edu/handle/1721.1/7582 109 p. application/pdf Massachusetts Institute of Technology |
| spellingShingle | Physics. Ghebrebrhan, Michael Anomalous phenomena and spectral tailoring in photonic crystals |
| title | Anomalous phenomena and spectral tailoring in photonic crystals |
| title_full | Anomalous phenomena and spectral tailoring in photonic crystals |
| title_fullStr | Anomalous phenomena and spectral tailoring in photonic crystals |
| title_full_unstemmed | Anomalous phenomena and spectral tailoring in photonic crystals |
| title_short | Anomalous phenomena and spectral tailoring in photonic crystals |
| title_sort | anomalous phenomena and spectral tailoring in photonic crystals |
| topic | Physics. |
| url | http://hdl.handle.net/1721.1/68970 |
| work_keys_str_mv | AT ghebrebrhanmichael anomalousphenomenaandspectraltailoringinphotoniccrystals |