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Optical Studies and Applications of Single Quantum Dots

Zwiller, Valéry LU (2001)
Abstract
The luminescence from single quantum dots has been studied. Single dot photoluminescence was studied under continuous as well as under pulsed excitation. Time-resolved studies revealed fast relaxations in quantum dots. The time resolved measurements were fitted with a set of rate equations. Blinking in the luminescence was observed on a few quantum dots. The polarization of the emission from single quantum dots was also measured.



The emission correlation was measured on a single dot and revealed the antibunched nature of the emission from single quantum dots. Single photon generation on demand was demonstrated with a single quantum dot under pulsed excitation. Attempts to generate entangled photon pairs with a single... (More)
The luminescence from single quantum dots has been studied. Single dot photoluminescence was studied under continuous as well as under pulsed excitation. Time-resolved studies revealed fast relaxations in quantum dots. The time resolved measurements were fitted with a set of rate equations. Blinking in the luminescence was observed on a few quantum dots. The polarization of the emission from single quantum dots was also measured.



The emission correlation was measured on a single dot and revealed the antibunched nature of the emission from single quantum dots. Single photon generation on demand was demonstrated with a single quantum dot under pulsed excitation. Attempts to generate entangled photon pairs with a single quantum dot were also made. Devices containing single quantum dots as the active region were fabricated. Light Emitting diodes were fabricated and studied, the electroluminescence from single quantum dots has been observed. Two types of microcavities containing single dots were also fabricated, planar microcavities where the light is confined between two planar mirrors and microdisks, where the light is confined in a high refractive index disk-shaped cavity in whispering modes. A processing technique was developed to position selected single quantum dots in microdisks with submicron resolution to achieve maximum coupling with the whispering modes.



The problem of the very limited light extraction efficiency from high refractive index materials was studied and solid immersion lenses were used to increase the light extraction efficiency from single quantum dots. Theoretical calculations gave results in good agreement with experimental observations. Further improvements to solid immersion lenses were also studied. (Less)
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author
opponent
  • Prof Solomon, Glenn, Stanford University, USA
organization
publishing date
type
Thesis
publication status
published
subject
keywords
time resolved photoluminescence, Physics, Fysik, Semiconductory physics, Halvledarfysik, Condensed matter:electronic structure, electrical, magnetic and optical properties, supraconductors, magnetic resonance, relaxation, spectroscopy, Kondenserade materiens egenskaper:elektronstruktur, egenskaper (elektriska, magnetiska och optiska), supraledare, spektroskopi, magnetisk resonans, microphotoluminescence, microcavities, photoluminescence, quantum optics, nano-optics, photonics, low dimensional structures, quantum dots, Fysicumarkivet A:2001:Zwiller
pages
224 pages
publisher
Solid State Physics, Lund University
defense location
Room B, Fysicum, Sölvegatan 14
defense date
2001-11-09 10:15
external identifiers
  • other:ISRN: LUFTD2/TFFF--01/0060--SE
ISBN
91-7874-153-X
language
English
LU publication?
yes
id
b4aa6c14-17b0-4b1e-8576-555ba6c75972 (old id 42029)
date added to LUP
2007-10-02 16:13:26
date last changed
2016-09-19 08:45:14
@phdthesis{b4aa6c14-17b0-4b1e-8576-555ba6c75972,
  abstract     = {The luminescence from single quantum dots has been studied. Single dot photoluminescence was studied under continuous as well as under pulsed excitation. Time-resolved studies revealed fast relaxations in quantum dots. The time resolved measurements were fitted with a set of rate equations. Blinking in the luminescence was observed on a few quantum dots. The polarization of the emission from single quantum dots was also measured.<br/><br>
<br/><br>
The emission correlation was measured on a single dot and revealed the antibunched nature of the emission from single quantum dots. Single photon generation on demand was demonstrated with a single quantum dot under pulsed excitation. Attempts to generate entangled photon pairs with a single quantum dot were also made. Devices containing single quantum dots as the active region were fabricated. Light Emitting diodes were fabricated and studied, the electroluminescence from single quantum dots has been observed. Two types of microcavities containing single dots were also fabricated, planar microcavities where the light is confined between two planar mirrors and microdisks, where the light is confined in a high refractive index disk-shaped cavity in whispering modes. A processing technique was developed to position selected single quantum dots in microdisks with submicron resolution to achieve maximum coupling with the whispering modes.<br/><br>
<br/><br>
The problem of the very limited light extraction efficiency from high refractive index materials was studied and solid immersion lenses were used to increase the light extraction efficiency from single quantum dots. Theoretical calculations gave results in good agreement with experimental observations. Further improvements to solid immersion lenses were also studied.},
  author       = {Zwiller, Valéry},
  isbn         = {91-7874-153-X},
  keyword      = {time resolved photoluminescence,Physics,Fysik,Semiconductory physics,Halvledarfysik,Condensed matter:electronic structure,electrical,magnetic and optical properties,supraconductors,magnetic resonance,relaxation,spectroscopy,Kondenserade materiens egenskaper:elektronstruktur,egenskaper (elektriska,magnetiska och optiska),supraledare,spektroskopi,magnetisk resonans,microphotoluminescence,microcavities,photoluminescence,quantum optics,nano-optics,photonics,low dimensional structures,quantum dots,Fysicumarkivet A:2001:Zwiller},
  language     = {eng},
  pages        = {224},
  publisher    = {Solid State Physics, Lund University},
  school       = {Lund University},
  title        = {Optical Studies and Applications of Single Quantum Dots},
  year         = {2001},
}