Date of Award
Open Access Dissertation
Physics and Astronomy
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.
Arash, S.(2021). Shedding Light on the Coupling Dynamics in Hybrid Nanostructures. (Doctoral dissertation). Retrieved from https://scholarcommons.sc.edu/etd/6614