Doctoral Dissertations

Author

Huixu Deng

Keywords and Phrases

Metamaterial; Micro-Fabrication; Multilayer; Optical Absorber

Abstract

“Optical metamaterlal (MM) absorbers in the visible or near-infrared range have been widely investigated in these years since they are crucial in many promising applications, such as solar energy harvesting systems, thermo-photovoltaic energy conversion devices, thermal imaging and emissivity control. This dissertation aims to design and investigate various optical metamaterial absorbers based on different mechanisms and theories, such as cavity resonance, impedance match, equivalent circuit model and waveguide stop light mode. First, via utilizing the cavity resonance, a tunable narrowband MM absorber/emitter for thermophotovoltaic (TPV) is designed and analyzed based on gold nanowire cavities to improve the overall efficiency of TPV systems. Second, a broadband absorber made of ultrathin silica-chromium-silica film working in visible and near-infrared (NIR) range is proposed and demonstrated using impedance transformation method. To further broaden the absorption range and enhance the absorption performance, another broadband absorber covering the visible and near-infrared (NIR) is proposed firstly utilizing the combination of the multilayer impedance match in the short wavelength range and the double resonances in the long wavelength range. Finally, an ultra-broadband multilayer waveguide absorber is designed and studied via the stop light trapped at different waveguide width. The stop light mode is analyzed based on the waveguide mode theory considering the guided forward mode and backward mode at the same waveguide width position”--Abstract, page iv.

Advisor(s)

Yang, Xiaodong

Committee Member(s)

Gao, Jie
Pan, Heng
Kinzel, Edward C.
Yamilov, Alexey

Department(s)

Mechanical and Aerospace Engineering

Degree Name

Ph. D. in Mechanical Engineering

Comments

This dissertation was supported by the Nanoscale Optics Laboratory and the Nanophotonics Laboratory at Missouri S&T, which are gratefully acknowledged.

This work was partially supported by the Intelligent Systems Center and the Energy Research and Development Center at Missouri S&T, the University of Missouri Interdisciplinary Intercampus Research Program, and the University of Missouri Research Board.

The authors acknowledge the support from the Ralph E. Powe Junior Faculty Enhancement Award and the National Science Foundation under grant CBET-1402743.

The authors acknowledge the facility support from the Materials Research Center at Missouri S&T. This work was performed, in part, at the Center for Nanoscale Materials, a U.S. Department of Energy Office of Science User Facility, and supported by the U.S. Department of Energy, Office of Science, under Contract No. DE-AC02- 06CH11357.

Research Center/Lab(s)

Intelligent Systems Center

Publisher

Missouri University of Science and Technology

Publication Date

Spring 2018

Journal article titles appearing in thesis/dissertation

  • Imetamaterial thermal emitters based on nanowire cavities for high-efficiency thermophotovoltaics
  • Broadband perfect absorber based on one ultrathin layer of refractory metal
  • Broadband infrared absorbers with stacked double chromium ring resonators
  • Ultra-broadband absorption in infrared by tapered hyperbolic waveguide absorber made of 13-pair au-SiO₂ multilayer

Pagination

x, 78 pages

Note about bibliography

Includes bibliographic references.

Rights

© 2018 Huixu Deng, All rights reserved.

Document Type

Dissertation - Open Access

File Type

text

Language

English

Thesis Number

T 11816

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