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Ultrafast Microscopy of Plasmonic Spin Topology

Ghosh, Atreyie (2023) Ultrafast Microscopy of Plasmonic Spin Topology. Doctoral Dissertation, University of Pittsburgh. (Unpublished)

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Abstract

Optics is a natural domain for designing and investigating topological phenomena because it describes the physical structuring and interaction of vectorial electromagnetic fields. My thesis focuses on ultrafast microscopy of plasmonic spin topology on nanometer spatial and femtosecond temporal scales. Topological quasi-particles such as skyrmions and merons, exhibit non-trivial and robust spin topology; hence, they demonstrate potential applications in spin-based electronics, information storage and quantum computing. Furthermore, they illuminate the role of symmetry in defining the structure of the universe and potentially the origin of homochirality of life. By combining ultrafast microscopy, nanofabrication, electromagnetic simulations and mathematical analysis, my research addresses the plasmonic spin topologies, and its role in this rapidly evolving field. Specifically, I theoretically and experimentally demonstrate the structuring of parity-time symmetry conserving magnetoelectric fields in plasmonic vortices with parallel plasmonic electric and magnetic vectorial structures on λ/2 length scales. For this purpose, I introduce nanodevices, which are easily fabricable, for generating unconventional topological plasmonic vortex lattices with defined spin textures.

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Details

Item Type: University of Pittsburgh ETD
Status: Unpublished
Creators/Authors:
CreatorsEmailPitt UsernameORCID
Ghosh, Atreyieatg33@pitt.eduatg330000-0003-1263-1566
ETD Committee:
TitleMemberEmail AddressPitt UsernameORCID
Committee ChairPetek, Hrvojepetek@pitt.edu
Committee MemberKim, Hong Koohkk@pitt.edu
Committee MemberMong, Rogerrmong@pitt.edu
Committee MemberBoudreau, Josephboudreau@pitt.edu
Committee MemberPurdy, Thomastpp9@pitt.edu
Date: 6 September 2023
Date Type: Publication
Defense Date: 31 July 2023
Approval Date: 6 September 2023
Submission Date: 16 July 2023
Access Restriction: 2 year -- Restrict access to University of Pittsburgh for a period of 2 years.
Number of Pages: 143
Institution: University of Pittsburgh
Schools and Programs: Dietrich School of Arts and Sciences > Physics
Degree: PhD - Doctor of Philosophy
Thesis Type: Doctoral Dissertation
Refereed: Yes
Uncontrolled Keywords: Plasmonics, Topology, Ultrafast
Date Deposited: 06 Sep 2023 15:57
Last Modified: 06 Sep 2023 15:57
URI: http://d-scholarship.pitt.edu/id/eprint/45300

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