PhD Defense by Shuaidi Zhang

Event Details
  • Date/Time:
    • Monday April 15, 2019
      3:00 pm - 5:00 pm
  • Location: MoSE 1126
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Summaries

Summary Sentence: Plasmonic Hybrid Nanoconstructs for Subwavelength Manipulation of Optical Properties

Full Summary: No summary paragraph submitted.

THE SCHOOL OF MATERIALS SCIENCE AND ENGINEERING

 

GEORGIA INSTITUTE OF TECHNOLOGY

 

Under the provisions of the regulations for the degree

DOCTOR OF PHILOSOPHY

on Monday, April 15, 2019

3:00 PM
in MoSE 1126

 

will be held the

 

DISSERTATION DEFENSE

for

 

Shuaidi Zhang

 

"Plasmonic Hybrid Nanoconstructs for Subwavelength Manipulation of Optical Properties"

 

Committee Members:

 

Prof. Vladimir V. Tsukruk, Advisor, MSE

Prof. Zhiqun Lin, MSE

Prof. Wenshan Cai, ECE/MSE

Prof. Younan Xia, BME, CHEM/ChBE

Prof. Ali Adibi, ECE

 

Abstract:

 

Plasmonic nanostructures give rise to intriguing optical phenomena such as deep-subwavelength light focusing, precisely tunable scattering/absorption, and super-linearity enhancement. These properties could be harnessed by combining plasmonic components with functional organics into plasmonic hybrid nanoconstructs for practical applications, such as molecular sensing, advanced displays, and photonic logic processing. However, to fully realize the potential of these plasmonic hybrid nanoconstructs, critical questions on fundamental aspects of organic-inorganic assembly and their coupling behavior need to be addressed. This work seeks understand some of these aspects and fill knowledge gaps regarding the efficient microfabrication and utilization of hybrid plasmonic nanoconstructs. Specifically, an advanced nanoscale characterization method based on scanning probe microscopy and secondary ion mass-spectrometry is developed to monitor the morphological and compositional changes on the surface of the exact same plasmonic nanocrystal as ligand exchange reaction proceeds, leading to new discoveries on reaction dynamics. Detailed characterization of nanoparticle distribution in organic matrices and corresponding electrodynamic modeling have also been combined to aid the rational design of a cellulose nanofiber-gold nanorod hybrid surface enhanced Raman spectroscopy based molecular sensing platform that outperforms traditional design by two orders of magnitude. New discoveries have also been made regarding the optical response of electrochromic polymer infused plasmonic nanohole arrays upon complex permittivity modulation: the forward and backward scattering shows drastically different response whose origin is explained by advanced electrodynamic simulation. Finally, using high resolution hyperspectral mapping and high-fidelity sub-nm resolution electrodynamic simulation, we furthered the understanding of coupling between plasmonic nanocrystals and photonic nanocavities and proposed a new method that uses the near-field coupling between plasmonic nanoparticle antennas to regulate the optical output of a plasmonic-photonic hybrid cavity, which could lead to extremely compact designs for nanolasers.

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Graduate Studies

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Public, Graduate students, Undergraduate students
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Other/Miscellaneous
Keywords
Phd Defense
Status
  • Created By: Tatianna Richardson
  • Workflow Status: Published
  • Created On: Apr 11, 2019 - 10:26am
  • Last Updated: Apr 11, 2019 - 10:26am