Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures

Bibliographic Details
Main Author:	Wang, Shiyi
Language:	English
Published:	University of Dayton / OhioLINK 2015
Subjects:	Engineering Experiments Electromagnetics Nanoscience Nanotechnology Optics Subwavelength antennas vectorial light meta-surface nano structures full wave control optical needle field
Online Access:	http://rave.ohiolink.edu/etdc/view?acc_num=dayton1427837723

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spelling	ndltd-OhioLink-oai-etd.ohiolink.edu-dayton14278377232021-08-03T06:29:33Z Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures Wang, Shiyi Engineering Experiments Electromagnetics Nanoscience Nanotechnology Optics Subwavelength antennas vectorial light meta-surface nano structures full wave control optical needle field With extraordinary properties, generation of complex electromagnetic field based on novel subwavelength antennas structures has attracted great attentions in many areas of modern nano science and technology, such as compact RF sensors, micro-wave receivers and nano-antenna-based optical/IR devices.This dissertation is mainly composed of two parts. For the first part, the idea of plasmonic localization in optical range is transferred and utilized for generating confined fields with high enhancement in RF range. A subwavelength modified bowtie antenna in RF range is designed for generating strong broadband field enhancement in its extended feed gap. The strongly enhanced RF field within the gap can be applied to directly modulate guided optical wave propagating in a waveguide, which enables to realize indirect RF signal sensing through photonic methods. Systematic exploration for modified bowtie antennas and its substrate effect has been given in this part. In the second part, the RF antenna design idea is extended to infrared and optical range based on antenna scaling theory specific for this spectrum. Both transmission and reflection types of metasurface structures have been designed and proposed to obtain optical needle field with a flat-top longitudinal intensity of depth of focus 5λ. With fine adjustment of different nano-antenna structures, both of the metasurfaces enable to generate complex vectorial field with spatial radial polarization, whose amplitude modulation range covers 0.07 to 1 with binary phase control. Then the scattered field can be tightly focused by a high numerical aperture (NA) lens in order to generate longitudinally polarized flat-top field along propagation direction. By exploring the subwavelength antennas’ mechanism and connections between different frequency regions, this dissertation is expected to provide general guidance for design and characterization of next-generation subwavelength antennas structures with extraordinary electromagnetic wave properties. 2015-05-27 English text University of Dayton / OhioLINK http://rave.ohiolink.edu/etdc/view?acc_num=dayton1427837723 http://rave.ohiolink.edu/etdc/view?acc_num=dayton1427837723 unrestricted This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.
collection	NDLTD
language	English
sources	NDLTD
topic	Engineering Experiments Electromagnetics Nanoscience Nanotechnology Optics Subwavelength antennas vectorial light meta-surface nano structures full wave control optical needle field
spellingShingle	Engineering Experiments Electromagnetics Nanoscience Nanotechnology Optics Subwavelength antennas vectorial light meta-surface nano structures full wave control optical needle field Wang, Shiyi Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures
author	Wang, Shiyi
author_facet	Wang, Shiyi
author_sort	Wang, Shiyi
title	Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures
title_short	Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures
title_full	Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures
title_fullStr	Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures
title_full_unstemmed	Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures
title_sort	engineering electromagnetic wave properties using subwavelength antennas structures
publisher	University of Dayton / OhioLINK
publishDate	2015
url	http://rave.ohiolink.edu/etdc/view?acc_num=dayton1427837723
work_keys_str_mv	AT wangshiyi engineeringelectromagneticwavepropertiesusingsubwavelengthantennasstructures
_version_	1719437598793924608

Engineering Electromagnetic Wave Properties Using Subwavelength Antennas Structures

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