Výsledky vyhledávání - "James Keeley"

Akademický článek

Coherent terahertz microscopy of modal field distributions in micro-resonators

Autor: Nikollao Sulollari, James Keeley, SaeJune Park, Pierluigi Rubino, Andrew D. Burnett, Lianhe Li, Mark C. Rosamond, Edmund H. Linfield, A. Giles Davies, John E. Cunningham, Paul Dean

Publikováno v: APL Photonics, Vol 6, Iss 6, Pp 066104-066104-9 (2021)

Near-field microscopy techniques operating in the terahertz (THz) frequency band offer the tantalizing possibility of visualizing with nanometric resolution the localized THz fields supported by individual resonators, micro-structured surfaces, and m

Externí odkaz: https://doaj.org/article/e7b4251bc1664d9f940820a3b87432b5

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Akademický článek

Measurement of the emission spectrum of a semiconductor laser using laser-feedback interferometry

Autor: James Keeley, Joshua Freeman, Karl Bertling, Yah Leng Lim, Reshma A. Mohandas, Thomas Taimre, Lianhe H. Li, Dragan Indjin, Aleksandar D. Rakić, Edmund H. Linfield, A. Giles Davies, Paul Dean

Publikováno v: Scientific Reports, Vol 7, Iss 1, Pp 1-9 (2017)

Abstract The effects of optical feedback (OF) in lasers have been observed since the early days of laser development. While OF can result in undesirable and unpredictable operation in laser systems, it can also cause measurable perturbations to the o

Externí odkaz: https://doaj.org/article/ecda9f8dc1b540f7bd7e36d99daa0d79

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Akademický článek

Laser Feedback Interferometry as a Tool for Analysis of Granular Materials at Terahertz Frequencies: Towards Imaging and Identification of Plastic Explosives

Autor: She Han, Karl Bertling, Paul Dean, James Keeley, Andrew D. Burnett, Yah Leng Lim, Suraj P. Khanna, Alexander Valavanis, Edmund H. Linfield, A. Giles Davies, Dragan Indjin, Thomas Taimre, Aleksandar D. Rakić

Publikováno v: Sensors, Vol 16, Iss 3, p 352 (2016)

We propose a self-consistent method for the analysis of granular materials at terahertz (THz) frequencies using a quantum cascade laser. The method is designed for signals acquired from a laser feedback interferometer, and applied to non-contact refl

Externí odkaz: https://doaj.org/article/7530cc84b9974e49889a6b8fdfe3baf9

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Elektronická kniha

Understanding Environmental Policy Processes : Cases From Africa

Autor: James Keeley, Ian Scoones

A critical analysis of the post-Rio consensus on environment and development which questions the role of particular forms of internationalized elite scientific expertise. It asks why certain understandings of environmental change stick with such tena

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Improving sepsis care in Africa: an opportunity for change?

Autor: Alexander James Keeley, Emmanuel Nsutebu

Publikováno v: The Pan African Medical Journal
Pan African Medical Journal; Vol. 40 No. 1 (2021)

Sepsis is common and represents a major public health burden with significant associated morbidity and mortality. However, despite substantial advances in sepsis recognition and management in well-resourced health systems, there remains a distinct la

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::6a9ef3b6f83f1f603761eee6167df43e
http://europepmc.org/articles/PMC8783315

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All-electronic phase-resolved THz microscopy using the self-mixing effect in a semiconductor laser

Autor: Paul Dean, Lianhe Li, Iman Kundu, Anton Valavanis, Alexander Giles Davies, Pierluigi Rubino, James Keeley, John Cunningham, Nikollao Sulollari, Edmund H. Linfield, Andrew D. Burnett, Mark C. Rosamond

We report all-electronic coherent scattering-type scanning near-field microscopy (s-SNOM) using a terahertz-frequency quantum cascade laser. By exploiting the coherent self-mixing effect in these lasers, in conjunction with electronic frequency tunin

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::c870f5058a07f5ac900b90601873ee65

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Coherent terahertz microscopy of modal field distributions in micro-resonators

Autor: Mark C. Rosamond, Nikollao Sulollari, James Keeley, Pierluigi Rubino, A. Giles Davies, Paul Dean, Lianhe Li, SaeJune Park, John Cunningham, Edmund H. Linfield, Andrew D. Burnett

Publikováno v: APL Photonics, Vol 6, Iss 6, Pp 066104-066104-9 (2021)

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::54df8cad8f7a941ad101538da60e1c5c
https://doaj.org/article/e7b4251bc1664d9f940820a3b87432b5

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Optomechanical response with nanometer resolution in the self-mixing signal of a terahertz quantum cascade laser

Autor: Pierluigi Rubino, Alessandro Pitanti, James Keeley, Edmund H. Linfield, Marco Cecchini, Paul Dean, Lianhe Li, A. Giles Davies, Alessandro Tredicucci, Andrea Ottomaniello

Publikováno v: Optics letters 44 (2019): 5663–5666. doi:10.1364/OL.44.005663
info:cnr-pdr/source/autori:Ottomaniello A.; Keeley J.; Rubino P.; Li L.; Cecchini M.; Linfield E.H.; Giles Davies A.; Dean P.; Pitanti A.; Tredicucci A./titolo:Optomechanical response with nanometer resolution in the self-mixing signal of a terahertz quantum cascade laser/doi:10.1364%2FOL.44.005663/rivista:Optics letters/anno:2019/pagina_da:5663/pagina_a:5666/intervallo_pagine:5663–5666/volume:44

The effectiveness of self-mixing interferometry has been demonstrated across the electromagnetic spectrum, from visible to microwave frequencies, in a plethora of sensing applications, ranging from distance measurement to material analysis, microscop

Externí odkaz: https://explore.openaire.eu/search/publication?articleId=doi_dedup___::fe119e76b4388fcb8cb241e908eb717d
https://pubmed.ncbi.nlm.nih.gov/31774748

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