A5065447182- Diamond and Carbon-based Materials Research
- Force Microscopy Techniques and Applications
- Semiconductor materials and devices
- Metal and Thin Film Mechanics
- High-pressure geophysics and materials
- Advanced Electron Microscopy Techniques and Applications
- Electronic and Structural Properties of Oxides
- Ion-surface interactions and analysis
- Advanced Surface Polishing Techniques
- Integrated Circuits and Semiconductor Failure Analysis
- Natural Language Processing Techniques
- ZnO doping and properties
- Electrochemical Analysis and Applications
- Modular Robots and Swarm Intelligence
- Evolutionary Algorithms and Applications
- Computer Graphics and Visualization Techniques
- Quantum Mechanics and Applications
- Neural Networks and Applications
- Quantum Information and Cryptography
- Metaheuristic Optimization Algorithms Research
- Ultrasonics and Acoustic Wave Propagation
- Advanced Fiber Laser Technologies
- 3D Surveying and Cultural Heritage
- Laser-Matter Interactions and Applications
- Topic Modeling
The University of Melbourne
2019-2024
University of Saskatchewan
2019
Saskatoon Medical Imaging
2019
University of Waterloo
2016
IBM (Ireland)
2015
IBM (United States)
2014
Sandia National Laboratories California
1968
Theoretical calculations of the consequences thermoelastic mechanism for production stress in solids by pulsed energy input have been performed, and effect variations acoustic impedance a transparent backup material pulse duration as compared to transit time across penetration depth incident investigated. Experimental verification theoretical has done using Q-switched ruby laser an source with samples absorbing glass targets. It is found that experimental results give good agreement shapes...
The precise measurement of mechanical stress at the nanoscale is fundamental and technological importance. In principle, all six independent variables tensor, which describe direction magnitude compression/tension shear in a solid, can be exploited to tune or enhance properties materials devices. However, existing techniques probe local are generally incapable measuring entire tensor. Here, we make use an ensemble atomic-sized situ strain sensors diamond (nitrogen-vacancy defects) achieve...
Surface micro- and nano-patterning techniques are often employed to enhance the optical interface single photoluminescent emitters in diamond, but utility of such surface structuring applications requiring ensembles is still open investigation. Here, we demonstrate scalable fault-tolerant fabrication closely packed arrays fluorescent diamond nanopillars, each hosting its own dense, uniformly bright ensemble near-surface nitrogen-vacancy centers. We explore optimal sizes for these structures...
Abstract Establishing connections between material impurities and charge transport properties in emerging electronic quantum materials, such as wide‐bandgap semiconductors, demands new diagnostic methods tailored to these unique systems. Many materials host optically‐active defect centers which offer a powerful situ characterization system, but one that typically relies on the weak spin‐electric field coupling measure phenomena. In this work, charge‐state sensitive optical microscopy is...
We present an implementation of photonic qubit precertification that performs the delicate task detecting presence a flying photon without destroying its state, allowing loss-sensitive quantum cryptography and tests nonlocality even over long distance. By splitting incoming single in two via parametric down-conversion, we herald photon's arrival from independent source while preserving information with up to $92.3\pm0.6$ % fidelity. With reduced detector dark counts, will be immediately...
In recent years, various forms of nanocrystalline diamond (NCD) have emerged as an attractive group diamond/graphite mixed-phase materials for a range applications from electron emission sources to electrodes neural interfacing. To tailor their properties different uses, NCD surfaces can be terminated with chemical functionalities, in particular hydrogen and oxygen, which shift the band edge positions affinity values. While chemically single crystal are well understood, same is not true...
Abstract Chemical functionalization of diamond surfaces by hydrogen is an important method for controlling the charge state near‐surface fluorescent color centers, essential process in fabricating devices such as field‐effect transistors and chemical sensors, a required first step realizing families more complex terminations through subsequent processing. In all these cases, termination typically achieved using plasma sources that can etch or damage diamond, well deposited materials embedded...
Modelling the crystal field excitations of dopants in SnO<sub>2</sub> is essential to understand how they can be used tune host material's properties.
Abstract Technologies that capture the complex electrical dynamics occurring in biological systems, across fluid membranes and at solid-liquid interfaces drive fundamental understanding innovation diverse fields from neuroscience to energy storage. However, capabilities of existing voltage imaging techniques utilizing micro-electrode arrays, scanning probes, or optical fluorescence methods are respectively limited by resolution, scan speed, photostability. Here we develop an optoelectronic...
Characterising charge transport in a material is central to the understanding of its electrical properties, and can usually only be inferred from bulk measurements derived quantities such as current flow. Establishing connections between host impurities properties emerging electronics materials, wide bandgap semiconductors, demands new diagnostic methods tailored these unique systems, presence optically-active defect centers materials offers non-perturbative, in-situ characterisation system....
Chemical functionalization of diamond surfaces by hydrogen is an important method for controlling the charge state near-surface fluorescent color centers, essential process in fabricating devices such as field-effect transistors and chemical sensors, a required first step realizing families more complex terminations through subsequent processing. In all these cases, termination typically achieved using plasma sources which can etch or damage well deposited materials embedded colour centers....
The microscopic electric environment surrounding a spin defect in wide-bandgap semiconductor plays determining role the coherence and charge stability of given qubit has an equally important defining electrical properties host material. Here, we use electrometry quantum defects embedded within diamond to observe stable, micron-scale space distributions formed from trapped photogenerated charges. These charges grow under optical illumination presence applied field, eventually screening field...
Quantum sensors based on optically active defects in diamond such as the nitrogen vacancy (NV) centre represent a promising platform for nanoscale sensing and imaging of magnetic, electric, temperature strain fields. Enhancing optical interface to is key improving measurement sensitivity these systems. Photonic nanostructures are often employed single emitter regime this purpose, but their applicability widefield with NV ensembles remains largely unexplored. Here we fabricate characterize...
Vector magnetometry with NV ensembles often overlooks the Hamiltonian Stark term, which contains contributions from both electric and stress fields. Here we show that Electric field vector full tensor can also be measured, further extending sensing modality of centre.