Project

Nano-fabrication of quantum photonic devices

Publisher

Supervisor

Location

Greater Copenhagen area

This project aims at processing crystal phase quantum dots in nanowires to propose new device designs for quantum photonic applications. This will be done using our state of the art clean room facility.

 Precise control of optical properties of quantum devices would represent a major milestone, yet to be demonstrated, for communication and computation technologies exploiting quantum mechanical phenomena, such as quantum cryptography or quantum network. To realize this technologic stride, our approach is to employ a novel concept which is control of crystal phase switching in nanowires.

This polytypism – presence of different crystal phases – was discovered 25 years ago when random segments of zinc blende and wurtzite crystal structures were found in nanowires. The great potential for applications of nanowires is hampered by the modification of their properties related to these “defects”. Despite the widespread research effort, this polytypism is still not yet well controlled.

Furthermore, enabling precise crystal phase control allows the realization of tailored crystal phase quantum dot (QD) -- consisting of small segments of ZB in WZ structure or vice versa in a nanowire – with atomically sharp interfaces. This unique advantage compared to other QDs -- made by changing or inserting an alloy in another host material -- would allow the production of device with controlled optical properties and uniformity.

This makes crystal phase QDs one of the most promising candidate as quantum bit building block.

In our team we aim to develop these homostructures towards development of novel quantum devices using a Metalorganic vapour phase epitaxy (MOVPE) reactor. We are actually growing InP NWs by self catalization on Si and InP wafers. To improve crystal purity and achieve phase switching, we are employing different strategies along with feedbacks from electronic microscopy and optical characterization.

Goals of the project (which may be modified according to the interests of the student)

-          Develop an understanding of the requirements for new quantum information devices

-          Realization of quantum photonic devises through crystal phase quantum dots 

Requirements

Knowledge in quantum mechanics or/and cleanroom processing would be an advantage

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Contact

Company / Organization

DTU Fotonik

Name

Nika Akopian

Position

Lektor

Mail

nikaak@fotonik.dtu.dk

Supervisor info

BSc in Physics and Nanotechnology

Supervisor

Nika Akopian

Co-supervisors

Daniel Pascal Chastanet

Type

BSc project, MSc thesis

MSc in Engineering, Photonics Engineering

Supervisor

Nika Akopian

Co-supervisors

Daniel Pascal Chastanet

Type

BSc project, MSc thesis

MSc in Physics and Nanotechnology

Supervisor

Nika Akopian

Co-supervisors

Daniel Pascal Chastanet

Type

BSc project, MSc thesis

Technical University of Denmark

For almost two centuries DTU, Technical University of Denmark, has been dedicated to fulfilling the vision of H.C. Ørsted – the father of electromagnetism – who founded the university in 1829 to develop and create value using the natural sciences and the technical sciences to benefit society.


Today, DTU is ranked as one of the foremost technical universities in Europe, continues to set new records in the number of publications, and persistently increases and develops our partnerships with industry, and assignments accomplished by DTU’s public sector consultancy.

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Anker Engelunds Vej 1
Bygning 101A
2800 Kgs. Lyngby

Denmark



Tlf. (+45) 45 25 25 25

CVR-nr. 30 06 09 46

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