Dynamically tunable localized surface plasmons using VO2 phase transition

Rahimi, Eesa (2017) Dynamically tunable localized surface plasmons using VO2 phase transition. [Thesis]

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The control of light with plasmonic devices in practical applications require dynamic tunability of localized surface plasmons. Employing phase change materials in plasmonic structure enables it to respond to light dynamically depending the external stimulate. This study investigates the response in presence of vanadium dioxide (VO2) phase transition for numbers of novel and classic problems. To illustrate the significance of optical spectrum tunability by VO2 two important functionalities for the phenomenon have been introduced. In the first application, a compact and ultrathin plasmonic metasurface is suggested for an ultra-short pulse shaping of transmitted pulse based on linear filtering principle of electromagnetic wave. It is demonstrated that the tunable optical filter by VO2 phase transition can compensate realtime input carrier frequency shifts and pulse span variations to stabilize the output pulse. Second application is dedicated to the field of intrachip optical communication which shows how VO2 phase transition can effectively switch a communicating antenna on and off. A substantial directional gain switching is obtained by employing VO2 phase transition to alternate resonances of a Yagi-Uda antenna elements. VO2 scattering functionality in absence of localized surface plasmons is studied to illustrate their promising performance in light reflection. Finally the behavior of localized surface plasmon resonators is studied and chimera stats which are the concurrent combination of synchronous and incoherent oscillations in a set of identical oscillators is shown for the first time in the optical regime. The effect of coupling strength on the phase scape/synchronization of the spaser-based devised oscillators is investigated.
Item Type: Thesis
Additional Information: Yükseköğretim Kurulu Tez Merkezi Tez No: 478682.
Uncontrolled Keywords: Localized surface plasmons. -- VO2 phase transition. -- Femtosecond pulse shaping. -- Yagi-Uda antenna. -- Chimera states. -- Lokalize yüzey plazmonları. -- VO2 faz geçişi. -- Femto saniye darbe şekillendirme. -- Yagi-Uda anteni. -- Chimera evreleri.
Subjects: T Technology > TJ Mechanical engineering and machinery > TJ163.12 Mechatronics
Divisions: Faculty of Engineering and Natural Sciences > Academic programs > Mechatronics
Faculty of Engineering and Natural Sciences
Depositing User: IC-Cataloging
Date Deposited: 13 Apr 2018 20:33
Last Modified: 26 Apr 2022 10:16
URI: https://research.sabanciuniv.edu/id/eprint/34442

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