Nanowires - Patrick Parkinson - Physics · Strategy

New Publication: Improving Quantum Well Tube Homogeneity Using Strained Nanowire Heterostructures

Group PhD student Nikesh Patel has just had his first paper accepted in ACS Applied Materials and Interfaces. His study uses a new methodology to understand how quantum "shells" - less than 10nm thick - vary both within single nanowires, and between them. By using automated high-throughput approaches

Stephen Church

New Publication: Holistic Nanowire Laser Characterization as a Route to Optimal Design

Group postdoc Stephen Church has just had a paper accepted into Advanced Optical Materials. In this work, he reports the study of thousands of individual nanowire lasers, using advanced statistical methods to identify a route to optimization. Photonic integrated circuitry is rapidly emerging as an alternative to electronics for specialist

arxiv

New preprint: Holistic nanowire laser characterization as a route to optimal design

Group postdoc Stephen Church has submitted his most recent work to the arXiv preprint server. In this new work, Stephen carried out optical, microscopic, and electron micrograph characterization of over 5000 nanowire lasers. By correlating geometry effects which affect the nanolaser cavity, and material quality that affect gain material, we

Conference Talk

Conference Presentation: CMD 2022

Two of the group gave oral presentations at CMD29 in Manchester. Group PhD student Hoyeon Choi reported his work on the “Impact of Microstructure of Crystallinity driven singlet fission efficiency in diF-TES-ADT“, a collaboration between Jenny Clark (Sheffield) our our group. Group PDRA Stephen Church reported his work on “Disentangling

big-data for nano-electronics

New Paper: Optical Characterisation of Nanowire Lasers

Group postdoc Stephen Church and PhD student Ruqaiya Al-Abri collaborated with Dhruv Saxena at Imperial College London to produce a review of methods to characterise nanowire lasers. This article, forming part of a celebration issue for the birthday of colleague Prof. Chennupati Jagadish (at the Australian National University) seeks to

ANU

Panel discussion

Patrick took part in a virtual panel discussion featuring collaborator Prof. Fu Lan (Australian National University) on the topic of nanowire quantum well arrays. The ICANX talk was moderated by Haixia Zhang of Peking University, and featured Weida Hu (SITP) and Noushin Nasir (Macquarie). The session is available to view

A*STAR

Funded PhD position with A*STAR

The group is now advertising for a funded PhD position as part of the A*STAR ARAP scheme, in collaboration with Kedar Hippalgaonkar of A*STAR and NTU in Singapore. The project will build on the high-throughput techniques developed in the Manchester group, and the Bayesian optimization approaches at A*

Book chapter

Physics and applications of semiconductor nanowire lasers - book chapter published

Patrick has contributed a chapter to the new textbook “Semiconductor Nanodevices“, edited by Prof. David Ritchie (University of Cambridge) and published by Elsevier. In his chapter on Physics and Applications of Semiconductor Nanowire Lasers, common features, design rules, seminal works and an outlook for future development are provided.

Ana Sanchez

New Paper: Defect-Free Axially Stacked GaAs/GaAsP Nanowire Quantum Dots with Strong Carrier Confinement

In a new collaboration between Yunyan Zhang and Profs. Huiyun Liu (UCL), Ana Sanchez (Warwick) and David Mowbray (Sheffield) we report the fabrication and measurement of a GaAs/GaAsP quantum dot-in-wire structure in Nano Letters. While many material architechtures have been explored for single photon emission, the GaAsP-GaAs system provides

Ana Sanchez

New Publication: Self-Catalyzed AlGaAs Nanowires and AlGaAs/GaAs Nanowire-Quantum Dots on Si Substrates

A new collaborative paper led by Giorgos Boros and the team of Xuezhe Yu and Huiyun Liu at University College London has been published in J Phys Chem C. In this work, Giorgos reported the development of high quality ternary nanowires (AlGaAs) grown via MBE. While the AlGaAs/GaAs heterostructure

ANU

New Paper : Facet-Related Non-uniform Photoluminescence in Passivated GaAs Nanowires

Our collaborative work on spatially inhomogeneous recombination in semiconductor nanowires has been published in a special issue of Frontiers in Chemistry. The work, led by Dr. Nian (Jenny) Jiang at the University of Cambridge reports the spatially varying emission intensity from passivated nanowires. By comparing the bulk emission to buried

ANU

New Paper: Carrier dynamics and recombination mechanisms in InP twinning superlattice nanowires

A new paper has been published in Optics Express, led by collaborator Xiaoming Yuan at Central South University (Changsha) and growth colleagues in the group of Prof. Jagadish at Australian National University. In this work, novel “twinning-superlattice” nanowires are grown. Once passivated, this growth method produces extremely high quality nanowires,

big-data for nano-electronics

Seminar : LIV.DAT

Patrick gave a virtual seminar at Liverpool Big Data Science Centre for Doctoral Training (LIV.DAT) on “Big-data for nano-electronics“. Thanks to Prof. Carsten Welsch for the invitation!

Fellowship

New Project: Big-Data for nano-electronics

Patrick has been awarded a 4-year research fellowship from UKRI for a project on “big-data for nano-electronics”. This Future Leaders Fellowship will enable Patrick to focus on building a research group to develop a new methodology for accelerating the study of functional nanotechnology. Project Summary The modern world runs on

Huiyun Liu

New Paper: Heterostructure and Q-factor engineering for low-threshold and persistent nanowire lasing

Group PhD student Stefan Skalsky’s paper on semiconductor nanowire lasing has just been published in Light: Science and Applications. In this new work, Stefan used his newly developed Interferometric Time-Correlated Single Photon Counting system (i-TCSPC) to measure the coherence length of laser emission from nanowires grown by the Liu

invited talk

Invited Talk at Photonics West 2020

Patrick gave an invited talk at Photonics West 2020 in San Francisco, in the session Novel Nano Structure. This talk convered recent work on ultra-low threshold nanowire lasers and experimental end-cavity reflectivity measurements in nanoscale systems.

Antonio Hurtado

New Paper: Characterisation, Selection and Micro-Assembly of Nanowire Laser Systems

Our collaborative work on the selection, transfer and testing of semiconductor nanowire lasers has now been published in Nano Letters. In this work, growth colleagues at ANU prepared nanowire lasers which were characterised at Manchester. This characterisation was used to select bins of nanowires, which were transferred using a cutting

Antonio Hurtado

New arXiv paper - Characterisation, Selection and Micro-Assembly of Nanowire Laser Systems

Our new paper produce in collaboration with Michael Strain and Antonio Hurtado (University of Strathclyde) and the Jagadish group (Australian National University) is now available on the arXiv. In this work, we combine high-quality nanolaser growth (ANU) with high-throughput optical spectroscopy (Manchester) and high-speed pick-and-place technology (Strathclyde) to demonstrate scaled-up

Nanowires

University of Oxford Condensed Matter Physics Seminar

Patrick gave the Oxford Condensed Matter Physics seminar on A needle in a needlestack – exploiting functional inhomogeneity for optimized nano-optoelectronics. In this talk, he presented on recent advances in using high-throughput spectroscopy to study nanowires for optoelectronic applications.

Nanowires

Collaborator visit to Sheffield

Ruqaiya and Patrick visited Prof. David Mowbray at the University of Sheffield to discuss nanowire spectroscopy research.

Arturo Alanis

New Paper - Threshold reduction and yield improvement of semiconductor nanowire lasers via processing-related end-facet optimization

Arturo has had a paper accepted for publication in Nanoscale Advances, describing the impact of the transfer process on the morphology and threshold of semiconductor nanowire lasers. While many studies have sought to improve the threshold for lasing in semiconductor nanowire lasers, the role of process has not been significantly

Nanowires

Talk at UK Semiconductors 2019

Group PhD student Stefan Skalsky gave a talk at the UK Semiconductors meeting in Sheffield. His talk, on “Nanosecond lasing and mm-scale optical coherence length in GaAsP/GaAs Quantum-Well Nanowire Lasers” descibed his recent work using interferometric time-resolved spectroscopy to reveal the end-facet reflectivity in nanowire lasers.

Nanowires

Tutorial Session at Jaszowiec 2019

Patrick gave a tutorial session at the Jaszowiec 2019 meeting – the International School and Conference on the Physics of Semiconductors – held in Szczyrk in Poland. The session covered the use of ultrafast spectroscopy for developing nanotechnology for optoelectronics, and specifically semiconductor nanowires. A copy of the presentation is available for

Nanowires

UK Semiconductor Nanowire Meeting 2019

Patrick spoke and both Arturo and Stefan gave posters at the 2019 UK Semiconductor Nanowire Meeting, held at Corpus Christi College in Oxford. The event was chaired by Patrick and Michael Johnston (Oxford Physics), and it brought nearly 35 researchers from 10 universities together to discuss nanowire research in the

Nanowires

New Paper - Highly-Strained III-V-V Co-Axial Nanowire Quantum Wells with Strong Carrier Confinement

A new paper has been accepted for publication in ACS Nano. This work, led by Dr. Yunyan Zhang and Prof. Huiyun Liu at University College London, describes the growth and characterisation of quantum-well tube nanowires based on GaAs-GaAsP heterostructures. This work brings together partners from UCL, Sheffield, Warwick, Lund (Sweden)