Dissertations, Theses, and Capstone Projects
Date of Degree
10-2014
Document Type
Dissertation
Degree Name
Ph.D.
Program
Physics
Advisor
Vinod M. Menon
Subject Categories
Nanoscience and Nanotechnology | Optics | Physics
Keywords
Light-Matter, Metamaterials, Nano-composite, Photoluminescence, Quantum Dots, Tunable
Abstract
This thesis describes the design, fabrication and characterization of certain nanostructures to engineer light-matter interaction. These materials have peculiar dispersion properties owing to their structural design, which is exploited to control spontaneous emission properties of emitters such as quantum dots and dye molecules. We will discuss two classes of materials based on the size of their unit cell compared to the wavelength of the electromagnetic radiation they interact with. The first class are hyperbolic metamaterials (HMM) composed of alternate layers of a metal and a dielectric of thicknesses much smaller than the wave- length. Using a HMM composed of silver and titanium dioxide, we demonstrate the optical equivalent of the well-known Lifshitz transition in electronic systems. Then we describe the development of a tunable HMM whose optical properties can be tuned. The tunability is achieved by exploiting the insulator to metal phase transition in vanadium dioxide. We then discuss the second class of materials - photonic crystals, in which the size scale of the unit cell is of the order of the wavelength of electromagnetic radiation they interact with. Due to strong scattering in such systems, bandgaps open up in certain directions, which we use to modify the spontaneous emission of a fluorescent dye.
Recommended Citation
Swaha Krishnamoorthy, Harish Natarajan, "Control of Light-Matter Interaction via Dispersion Engineering" (2014). CUNY Academic Works.
https://academicworks.cuny.edu/gc_etds/391