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Terahertz Hybrid Graphene-Metal Reflectarrays.

Record Type:	Language materials, printed : Monograph/item
Title/Author:	Terahertz Hybrid Graphene-Metal Reflectarrays./
Author:	Karmakar, Arka.
Published:	Ann Arbor : ProQuest Dissertations & Theses, : 2019,
Description:	97 p.
Notes:	Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
Contained By:	Dissertations Abstracts International80-09B.
Subject:	Electrical engineering. -
Online resource:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=13427246
ISBN:	9780438945227

Terahertz Hybrid Graphene-Metal Reflectarrays.
Karmakar, Arka.

Terahertz Hybrid Graphene-Metal Reflectarrays. - Ann Arbor : ProQuest Dissertations & Theses, 2019 - 97 p.

Source: Dissertations Abstracts International, Volume: 80-09, Section: B.

Thesis (Ph.D.)--State University of New York at Buffalo, 2019.

This item must not be added to any third party search indexes.

Graphene, which is a planar or 2D allotrope of carbon, is actually the building block of graphite. Graphene has potential applications in many fields, such as highfrequency field-effect transistors, flexible electronics, touch panels, optoelectronic devices, energy storage devices, and wearable technology. Despite such promise, most of the graphene-based applications to date are limited to either theoretical work or laboratory research. This is due to the many challenges related to fabrication of graphene-based devices. Continuous graphene is a necessity for many electrical and optical applications. These applications, however, are built upon substrates that are not suitable for graphene growth. As a result, graphene must be transferred from its growth substrate (usually Cu foil) to a different substrate (such as a silicon wafer). Transfer techniques often introduce defects in graphene, such as wrinkles, cracks, and voids or holes. To address this problem, we developed a wet graphene transfer method in which we add a copolymer to poly(methyl methacrylate) (PMMA) prior to transfer. Unlike previously reported wet methods, we show that adding a copolymer layer atop a PMMA layer before transfer improves graphene continuity by virtually eliminating cracks and holes. The result, as determined by quantitative image analysis, is 99.8% continuous graphene over a 1 cm x 1 cm area. In addition to its many unique electronic properties, graphene can sustain THz-frequency plasmons at room temperature. In an attempt to exploit this property for THz communication, we have demonstrated a hybrid graphene–metal reflectarray structure. In this reflectarray, the active elements are metal and graphene reduces the reflected power by destroying the confinement. Lastly, we investigate all-graphene plasmonic antenna arrays, and propose an array of suspended graphene regions to realize plasmonic resonant cavities.

ISBN: 9780438945227Subjects--Topical Terms:

596380
Electrical engineering.
Subjects--Index Terms:

Antenna

Terahertz Hybrid Graphene-Metal Reflectarrays.
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300 $a 97 p.
500 $a Source: Dissertations Abstracts International, Volume: 80-09, Section: B.
500 $a Publisher info.: Dissertation/Thesis.
500 $a Advisor: Einarsson, Erik.
502 $a Thesis (Ph.D.)--State University of New York at Buffalo, 2019.
506 $a This item must not be added to any third party search indexes.
506 $a This item must not be sold to any third party vendors.
520 $a Graphene, which is a planar or 2D allotrope of carbon, is actually the building block of graphite. Graphene has potential applications in many fields, such as highfrequency field-effect transistors, flexible electronics, touch panels, optoelectronic devices, energy storage devices, and wearable technology. Despite such promise, most of the graphene-based applications to date are limited to either theoretical work or laboratory research. This is due to the many challenges related to fabrication of graphene-based devices. Continuous graphene is a necessity for many electrical and optical applications. These applications, however, are built upon substrates that are not suitable for graphene growth. As a result, graphene must be transferred from its growth substrate (usually Cu foil) to a different substrate (such as a silicon wafer). Transfer techniques often introduce defects in graphene, such as wrinkles, cracks, and voids or holes. To address this problem, we developed a wet graphene transfer method in which we add a copolymer to poly(methyl methacrylate) (PMMA) prior to transfer. Unlike previously reported wet methods, we show that adding a copolymer layer atop a PMMA layer before transfer improves graphene continuity by virtually eliminating cracks and holes. The result, as determined by quantitative image analysis, is 99.8% continuous graphene over a 1 cm x 1 cm area. In addition to its many unique electronic properties, graphene can sustain THz-frequency plasmons at room temperature. In an attempt to exploit this property for THz communication, we have demonstrated a hybrid graphene–metal reflectarray structure. In this reflectarray, the active elements are metal and graphene reduces the reflected power by destroying the confinement. Lastly, we investigate all-graphene plasmonic antenna arrays, and propose an array of suspended graphene regions to realize plasmonic resonant cavities.
590 $a School code: 0656.
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650 4 $a Materials science. $3 557839
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653 $a Thz
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710 2 $a State University of New York at Buffalo. $b Electrical Engineering. $3 845470
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792 $a 2019
793 $a English
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