Date of Graduation
Master of Science in Microelectronics-Photonics (MS)
Donald K. Roper
Second Committee Member
Third Committee Member
Applied sciences; Coupled dipole approximatio; Diffraction; Mie theory; Nanostructured arrays; Plasmonics; Polarizability
Plasmonic nanoparticles organized in arrays interact to create spectral patterns which are amplified by individual particle polarizability. It was hypothesized that particle polarizability could be used as a predictor of spectral behavior from far-field interactions within the array. Inter-particle coupling produced an extraordinary peak in extinction efficiency at wavelengths equal to or larger than the single particle plasmon resonance peak. Interactions that produced constructive coupling were found to mimic changes in the particle polarizability model. Testing of the hypothesis was performed using the coupled dipole approximation with parametric characterization of array geometries, giving specific particle size and lattice constant combinations which constructively couple diffracted light to individual particle polarizability. An extension to the dipole polarizability in the coupled dipole approximation that included effects from quadrupoles is given here which gave results in support of the hypothesis. Optimization of ordered nanoparticle array configuration through identification of specific polarizability values that yielded constructive coupling has application in enhancement of photovoltaics, sensors, detectors, and other opto-electronic devices.
Dejarnette, D. (2012). An Extension to Particle Polarizability to Predict Coupling Behavior in Periodic Nanoplasmonic Arrays. Theses and Dissertations Retrieved from https://scholarworks.uark.edu/etd/540