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Identifier

000411943

Title

Development of high temperature single photon emitters based on InAs piezoelectric quantum dots

Alternative Title

Ανάπτυξη μονοφωτονικών πηγών υψηλών θερμοκρασιών με βάση πιεζοηλεκτρικές κβαντικές τελείες InAs

Author

Θυρής, Ιωάννης Μ.

Thesis advisor

Πελεκάνος, Νικόλαος

Reviewer

Χατζόπουλος, Ζαχαρίας
Κοπιδάκης, Γεώργιος

Abstract

The present thesis is focused on InAs piezoelectric quantum dots grown on the (211)B crystallographic orientation, for the development of single-photon sources operating at high temperatures. Single photons are good candidates for the realization of qubits based on photon polarization states, needed for quantum information schemes. At first, a brief introduction to the piezoelectric quantum dots is given, as well as the relevant background. Then, after introducing the short-period super-lattice, a core element to our structures for high temperature emission, an experimental investigation is presented on samples grown for the purposes of this thesis and their emission at high temperatures is characterized through temperature-dependent photoluminescence measurements. Later, the notion of embedding our quantum dots in micro-cavities for enhancing the detected signal is presented. After the introduction on how a micro-cavity affects the quantum dot emission, an experimental study on micro-cavity samples is presented. Their quantum dot emission is characterized through photoluminescence, the cavity characteristics by reflectivity measurements, while on the sample with the most intense emission, micro-photoluminescence measurements have been performed, after the formation of micro-pillars. Lastly, the mechanism related to the low indium content of our dots is discussed, as well as the notion of using an AlAs capping-layer to increase it. An experimental investigation is presented on the effect of depositing a thin AlAs capping layer ontop of the dots to their emission and structural properties.

Language

English

Subject

AlAs capping-layer

Micro-Photoluminescence

Micro-cavity

Photoluminescence

Short-Period Super-Lattice

Single-Dot spectroscopy

Single-Photon emitters

Μονοφωτονικές πηγές

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