Optical Studies and Applications of Single Quantum Dots

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 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.

• author: Zwiller, Valéry
• supervisor: [unknown] [unknown]
• opponent: Prof Solomon, Glenn, Stanford University, USA
• organization: Solid State Physics
• publishing date: 2001
• type: Thesis
• publication status: published
• subject: Condensed Matter Physics
• 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
• defense location: Room B, Fysicum, Sölvegatan 14
• defense date: 2001-11-09 10:15:00
• external identifiers: other:ISRN: LUFTD2/TFFF--01/0060--SE
• ISBN: 91-7874-153-X
• language: English
• LU publication?: yes
• additional info: Article: Size reduction of self-assembled quantum dots by annealing, J. Johansson, W. Seifert, V. Zwiller, T. Junno, L. Samuelson, Appl. Surf. Sci. {134}, 47-52 (1998); Article: Time-resolved studies of single semiconductor quantum dots, V. Zwiller, M.-E. Pistol, D. Hessman, R. Cederstrom, W. Seifert, L. Samuelson, Phys. Rev. B {59}, 5021-5025 (1999); Article: Excited state dynamics in In0.5Al0.04Ga0.46As/Al0.08Ga0.92As self-assembled quantum dots,L. M. Smith, K. Leosson, J. Erland, J. R. Jensen, J. M. Hvam, V. Zwiller, Phys. Stat. Sol. B {224:2}, 447-451 (2001); Article: Photoluminescence polarization of single InP quantum dots, V. Zwiller, L. Jarlskog, M.-E. Pistol, C. Pryor, P. Castrillo, W. Seifert, L. Samuelson, Phys. Rev. B {63}, 233301-1 -4 (2001); Article: Single quantum dots emit single photons at a time: Antibunching experiments, V. Zwiller, H. Blom, P. Jonsson, N. Panev, S. Jeppesen, T. Tsegaye, E. Goobar, M.-E. Pistol, L. Samuelson, G. Bjork, Appl. Phys. Lett. {78}, 2476-2478 (2001); Article: Correlation spectroscopy of excitons and biexcitons in a single quantum dot, V. Zwiller, P. Jonsson, H. Blom, S. Jeppesen, L. Samuelson, A. A. Katznelson, E. Y. Kotelnikov, V. Evtikhiev, G. Bjork, Submitted to Phys. Rev. A; Article: Random telegraph noise in the photoluminescence of individual Ga(x)In(1-x)As quantum dots in GaAs, N. Panev, M.-E. Pistol, V. Zwiller, L. Samuelson, W. Jiang, B. Xu, Z. Wang, Phys. Rev. B {64}, 045317-1-4 (2001); Article: Positioning single dots in microdisks, V. Zwiller, S. Falth, W. Seifert, M.-E. Pistol, L. Samuelson, Manuscript; Article: Improving the light extraction efficiency of single emitters using solid immersion lenses, V. Zwiller, G. Bjork, Submitted to J. Appl. Phys.; Article: Solid state single photon sources: the collection efficiency problem, W. L. Barnes, G. Bjork, J.-M. Gerard, P. Jonsson, J. A. E. Wasey, P. T. Worthing, V. Zwiller, Accepted for publication in Eur. Phys. J. D.; Article: Parallel near-field scanning optical microscope, V. Zwiller, Submitted
• id: b4aa6c14-17b0-4b1e-8576-555ba6c75972 (old id 42029)
• date added to LUP: 2016-04-04 12:08:39
• date last changed: 2018-11-21 21:09:14