The Study of Coupling in InGaAs Quantum Rings Grown by Droplet Epitaxy

The use of metal droplet epitaxy may provide a novel method of growing laterally coupled nanostructures. We will present optical studies of InAs/GaAs nanostructures which result in twin quantum dots (QD) formed on a single quantum ring (QR). Previous studies have investigated the coupling between vertically grown quantum dot pairs. In this thesis, we have used photoluminescence (PL) and photoluminescence excitation (PLE) to examine the possibility of energy transfer and coupling between quantum dot pairs in a single InGaAs quantum ring grown by droplet epitaxy. Power dependent photoluminescence spectra reveal a few peaks at low power, which are identified with emission from the ground state of the individual dots. As the power is increased we observe multi-exciton and excited state emission. We then perform PLE, tuning the excitation laser energy continuously from the high energy ring emission down to the individual dot states. We have observed resonant PLE emission in the QD/QR structures both at high laser energy and when resonant with the identified states of one of the QDs which may indicate energy transfer and/or coupling between the dots.

Name thesis:degree_name

Master of Science (MS)

Level thesis:degree_level

masters

Discipline thesis:degree_discipline

Physics and Astronomy (Arts and Sciences)

Grantor dc:publisher

Ohio University

Year dc:date

2013

Author dc:creator

• Alsolamy, Samar M.

Contributors dc:contributor

• Stinaff, Eric
• Drabold, David

• Condensed Matter Physics
• Quantum Rings
• Quantum Dots
• Energy Transfer
• Droplet Epitaxy
• Photoluminescence Excitation
• Photoluminescence.

Statement dc:rights

• unrestricted
• This thesis or dissertation is protected by copyright: all rights reserved. It may not be copied or redistributed beyond the terms of applicable copyright laws.

Language dc:language

English

Repository record dc:identifier

http://rave.ohiolink.edu/etdc/view?acc_num=ohiou1357840899

OAI identifier oai:identifier

oai:etd.ohiolink.edu:ohiou1357840899