Date of Award
Fall 2021
Document Type
Open Access Dissertation
Department
Physics and Astronomy
First Advisor
Yanwen Wu
Abstract
Here we present all-optical investigations of two hybrid nanostructures. In the first hybrid system, we study Janus-type nanofibers consisting of two hemi-cylinders of ferroelectric barium titanate and ferrimagnetic cobalt ferrite. Using the magnetic field-dependent polarization-resolved second harmonic generation technique, we observe a strong magnetoelectric coupling between the two ferroic constituents at room temperature. Corroborating these results by X-ray diffraction, we can also extract repeatable memory-dependent behaviors in these biphasic nanofibers. In the second hybrid system, we study the interaction between the semiconductor indium/gallium arsenide quantum dots and surface plasmon supporting silver structures in the weak coupling regime. When quantum dots are excited above the gallium arsenide band gap energy, we observe polarization- and bias-dependent transitions between different exciton charge states. We also observe a polarization-dependent effect in the photoluminescence signal when exciting below this band gap energy. Both these behaviors are absent in dots away from plasmonic structures.
Rights
© 2021, Saba Arash
Recommended Citation
Arash, S.(2021). Shedding Light on the Coupling Dynamics in Hybrid Nanostructures. (Doctoral dissertation). Retrieved from https://scholarcommons.sc.edu/etd/6614
