A study of novel mid-infrared optical devices: Wave plates and tunable filters
Taylor, Andrew
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https://hdl.handle.net/2142/44174
Description
Title
A study of novel mid-infrared optical devices: Wave plates and tunable filters
Author(s)
Taylor, Andrew
Issue Date
2013-05-24T21:53:23Z
Director of Research (if dissertation) or Advisor (if thesis)
Wasserman, Daniel M.
Department of Study
Electrical & Computer Eng
Discipline
Electrical & Computer Engr
Degree Granting Institution
University of Illinois at Urbana-Champaign
Degree Name
M.S.
Degree Level
Thesis
Keyword(s)
Mid-Infrared
Wave Plate
Birefringence
Filter
Subwavelength grating
Plasmons
Abstract
The mid-infrared wavelength range is important for both molecular sensing and thermal imaging. However, many optical devices that are common in the visible range are not as accessible in the mid-infrared. In this thesis, we look to partially address this problem by proposing two novel structures using subwavelength gratings. First, we look at a wave plate design that uses a physical path length difference to impose a phase shift between the components of incident light as an alternative to costly birefringent crystals. Then, we look at a crossed grating structure that serves as a narrowband filter due to its extraordinary transmission. We also propose a way to make the filter structure actively tunable.
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