Resonant Photonic Structures for Control of Light-Matter Interaction in Semiconductor Nanostructures
Item
-
Title
-
Resonant Photonic Structures for Control of Light-Matter Interaction in Semiconductor Nanostructures
-
Identifier
-
d_2009_2013:78b2b20ecd7a:11544
-
identifier
-
12052
-
Creator
-
Goldberg, David,
-
Contributor
-
Vinod M. Menon
-
Date
-
2012
-
Language
-
English
-
Publisher
-
City University of New York.
-
Subject
-
Optics
-
Abstract
-
In this thesis, the control of light-matter interaction in semiconductor nanostructures was investigated using resonant photonic structures. This study is categorized in two parts: collective phenomena of quantum confined excitons, and quantum dots in microcavity structures.;The collective behavior of excitons is studied in a resonant multiple-quantum-well structure. In this system, the quantum-wells are separated by barrier layers such that the distance between excitons of neighboring quantum-wells is half of their resonant wavelength (lambda/2), the so-called Bragg condition. The Bloch modes of the background photonic crystal introduced by the refractive index contrast between the well and barrier layers interact coherently with the ensemble of excitons forming Bloch-polaritons. These Bloch-polaritons are characterized by low-temperature angle resolved spectroscopic measurements. Large changes in reflectance are observed in response to an externally applied electric field due to the system transition between strong and weak coupling regimes.;In addition, a system of colloidal quantum-dot clusters were investigated for evidence of superradiant emission by means of time-resolved and steady state photoluminescence spectroscopy.;Microcavities incorporating quantum dots in the cavity layer were investigated under low, and high concentration regimes. With low concentrations of quantum dots, spectroscopic measurements reveal the quantum dots emit through the cavity resonance, and power dependent studies show the emission intensity has a linear dependence on pumping fluence, with no reduction in linewidth, resulting from the system being below the gain threshold. However, a similar investigation on a system with a high quantum dot concentration reveal gain occurring at the biexciton energy accompanied by highly directional emission.;Systems of coupled-cavities were also studied where features similar to electromagnetically-induced-transparency were observed from spectroscopic measurements. Under specific coupling criteria, the photon field intensity distribution of the system exhibits a bright and a dark cavity. When incorporating quantum dots in the bright cavity, resonant emission is observed. However, when incorporating quantum dots in the dark cavity, only uncoupled emission is observed.
-
Type
-
dissertation
-
Source
-
2009_2013.csv
-
degree
-
Ph.D.
-
Program
-
Physics
