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Full Wave Electromagnetic Simulations of Terahertz Wire Grid Polarizers and Infrared Plasmonic Wire Gratings

Cetnar, John
http://rave.ohiolink.edu/etdc/view?acc_num=wright1398356024

Abstract Details

2014, Doctor of Philosophy (PhD), Wright State University, Engineering PhD.
This dissertation is a study of the interaction of terahertz (THz) and long-wave infrared (LWIR) radiation with various periodic sub-wavelength metallic structures in free-space and on dielectric substrates. There are many new and useful applications for both THz and LWIR radiation. Unfortunately, heavy attenuation by the Earth’s atmosphere and low output power from THz sources combine to make THz radiation weak and difficult to detect. LWIR is not as prone to atmospheric attenuation as THz radiation. Nevertheless, the detection of LWIR can be improved upon by strengthening the coupling between incoming radiation and LWIR detector systems. Light passing through periodic sub-wavelength metallic structures can exhibit extraordinary optical transmission (EOT). When EOT occurs, the amount of light transmitted through such structures is enhanced to well beyond what would be predicted by geometric optics. In addition, exceedingly high electromagnetic (EM) fields develop in the apertures and along the conducting surfaces of EOT structures. These enhanced fields may be used to improve the performance of a THz or LWIR detector through a significant reduction in its size while maintaining good external radiation coupling. Full-wave numerical simulations using the finite element method (FEM) were used to study the interaction of THz and LWIR radiation with one- and two-dimensional surface plasmonic EOT structures. This dissertation examines the numerical solutions to the Helmholtz wave equation for radiation interacting with plasmonic structures in both the THz and LWIR regions. The simulation results predict that both EOT and EM field enhancement will occur in both regions. In several cases, plasmonic structures designed from optimized FEM results have been fabricated and characterized. The experimental results confirm the simulation predictions qualitatively and quantitatively to within a few dB. Nevertheless, it must be noted that although detectors were a strong motivation for the research conducted here, the realization of detector improvement was not carried out.
Elliott Brown, Ph.D. (Advisor)
Doug Petkie, Ph.D. (Committee Member)
Jason Deibel, Ph.D. (Committee Member)
Peter Powers, Ph.D. (Committee Member)
Dave Tomich, Ph.D. (Committee Member)
187 p.
Electrical Engineering; Electromagnetics; Engineering; Optics; Physics
Extraordinary Optical Transmission, surface plasmons, structured surface plasmons, terahertz, wire grid polarizers, plasmonic wire gratings

Recommended Citations

Citations

  • Cetnar, J. (2014). Full Wave Electromagnetic Simulations of Terahertz Wire Grid Polarizers and Infrared Plasmonic Wire Gratings [Doctoral dissertation, Wright State University]. OhioLINK Electronic Theses and Dissertations Center. http://rave.ohiolink.edu/etdc/view?acc_num=wright1398356024

    APA Style (7th edition)

  • Cetnar, John. Full Wave Electromagnetic Simulations of Terahertz Wire Grid Polarizers and Infrared Plasmonic Wire Gratings. 2014. Wright State University, Doctoral dissertation. OhioLINK Electronic Theses and Dissertations Center, http://rave.ohiolink.edu/etdc/view?acc_num=wright1398356024.

    MLA Style (8th edition)

  • Cetnar, John. "Full Wave Electromagnetic Simulations of Terahertz Wire Grid Polarizers and Infrared Plasmonic Wire Gratings." Doctoral dissertation, Wright State University, 2014. http://rave.ohiolink.edu/etdc/view?acc_num=wright1398356024

    Chicago Manual of Style (17th edition)

wright1398356024
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© 2014, some rights reserved.Creative Commons License Full Wave Electromagnetic Simulations of Terahertz Wire Grid Polarizers and Infrared Plasmonic Wire Gratings by John Cetnar is licensed under a Creative Commons Attribution-NonCommercial-NoDerivs 3.0 Unported License. Based on a work at etd.ohiolink.edu.
This open access ETD is published by Wright State University and OhioLINK.