Physics
Recent Submissions
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Microscope calibration using laser written fluorescence (dataset)
(University of Exeter, 2018-08-09)This is the dataset used for the Corbett et al. (2018) article "Microscope calibration using laser written fluorescence" published in Optics Express. -
Microscope calibration using laser written fluorescence (article)
(Optical Society of America, 2018)There is currently no widely adopted standard for the optical characterisation of fluorescence microscopes. We used laser written fluorescence to generate two- and three-dimensional patterns to deliver a quick and quantitative ... -
Strong beaming of microwave surface waves with complementary split-ring-resonator arrays (dataset)
(University of Exeter, 2018-08-08)A thin copper sheet, populated by an array of complementary split ring resonators, presents strong surface wave beaming in orthogonal directions at two distinct frequencies. This simple array is significantly thinner than ... -
Strong beaming of microwave surface waves with complementary split-ring-resonator arrays (article)
(Nature Publishing Group, 2018)A thin copper sheet, populated by an array of complementary split ring resonators, presents strong surface wave beaming in orthogonal directions at two distinct frequencies. This simple array is significantly thinner than ... -
Isotropic Backward Waves Supported by a Spiral Array Metasurface.
(Nature Publishing Group, 2018-05-08)A planar metallic metasurface formed of spiral elements is shown to support an isotropic backward wave over a narrow band of microwave frequencies. The magnetic field of this left-handed mode is mapped experimentally using ... -
Mimicking graphene physics with a plane hexagonal wire mesh
(AIP Publishing, 2018-05-07)A hexagonal metallic-wire mesh is fabricated and experimentally characterized to demonstrate graphene-physics in an electromagnetic analogue. In contrast to previous studies, our structure has a smaller ratio of out-of-plane ... -
The MIRC-X 6-telescope imager: Key science drivers, instrument design and operation
(Society of Photo-optical Instrumentation Engineers (SPIE), 2018-07-09)MIRC-X is a new beam combination instrument at the CHARA array that enables 6-telescope interferometric imaging on object classes that until now have been out of reach for milliarcsecond-resolution imaging. As part of an ... -
MIRC-X/CHARA: sensitivity improvements with an ultra-low noise SAPHIRA detector
(Society of Photo Optical Instrumentation Engineers (SPIE), 2018-07-09)MIRC-X is an upgrade of the six-telescope infrared beam combiner at the CHARA telescope array, the world's largest baseline interferometer in the optical/infrared, located at the Mount Wilson Observatory in Los Angeles. ... -
Investigation into the toxic effects of graphene nanopores on lung cancer cells and biological tissues
(Elsevier, 2018-07-28)As an inexpensive monolayer archetypal member of the carbon family, graphene has triggered a new ‘gold rush’ in nanotechnology for achieving unique properties that were not available in many traditional materials. Owing ... -
The dependence of stellar properties on initial cloud density
(Oxford University Press (OUP), 2018-05-15)We investigate the dependence of stellar properties on the initial mean density of the molecular cloud in which stellar clusters form using radiation hydrodynamical simulations that resolve the opacity limit for fragmentation. ... -
Sink particle radiative feedback in smoothed particle hydrodynamics models of star formation
(Oxford University Press (OUP), 2018-07-23)We present a new method for including radiative feedback from sink particles in smoothed particle hydrodynamics simulations of low-mass star formation, and investigate its effects on the formation of small stellar groups. ... -
Circumstellar disc lifetimes in numerous galactic young stellar clusters
(Oxford University Press, 2018-07-11)Photometric detections of dust circumstellar discs around pre-main sequence (PMS) stars, coupled with estimates of stellar ages, provide constraints on the time available for planet formation. Most previous studies on disc ... -
Modelling massive star feedback with Monte Carlo radiation hydrodynamics: photoionization and radiation pressure in a turbulent cloud
(Oxford University Press, 2018-04-21)We simulate a self-gravitating, turbulent cloud of 1000 M⊙ with photoionization and radiation pressure feedback from a 34 M⊙ star. We use a detailed Monte Carlo radiative transfer scheme alongside the hydrodynamics to ... -
Long-term distributions of individual wave and crest heights
(Elsevier, 2018-07-21)This paper considers three types of method for calculating return periods of individual wave and crest heights. The methods considered differ in the assumptions made about serial correlation in wave conditions. The long-term ... -
A broadband stripline technique for characterizing relative permittivity and permeability (dataset)
(University of Exeter, 2018-07-11)We present a stripline design and calibration method allowing the extraction of relative permittivity of single dielectric samples in the 200 MHz – 50 GHz range. The simultaneous extraction of relative permittivity and ... -
Biocompatibility and toxicity of graphene quantum dots for potential application in photodynamic therapy
(Future Medicine, 2018)Aim: Achieving reliably high production of reactive oxygen species (ROS) in photodynamic therapy (PDT) remains challenging. Graphene quantum dots (GQD) hold great promise for PDT. However, the photochemical processes leading ... -
Sensitivity of Transmission Raman Spectroscopy Signals to Temperature of Biological Tissues
(Springer Nature, 2018-05-30)Optical properties of biological tissues can be influenced by their temperature, thus affecting light transport inside the sample. This could potentially be exploited to deliver more photons inside large biological samples, ... -
Age-related changes in femoral head trabecular microarchitecture
(Buck Institute for Age Research, 2018)Osteoporosis is a prevalent bone condition, characterised by low bone mineral density and increased fracture risk. Currently, the gold standard for identifying osteoporosis and increased fracture risk is through quantification ... -
A simple and robust method for calculating return periods of ocean waves
(ASME: The American Society of Mechanical Engineers, 2018-06)A new method is introduced for combining the long-term distribution of sea states with the short-term distribution of individual wave or crest heights, conditional on sea state. The method uses a Monte Carlo approach to ... -
An absolute sodium abundance for a cloud-free 'hot Saturn' exoplanet.
(Nature Publishing Group, 2018-05-07)Broad absorption signatures from alkali metals, such as the sodium (Na I) and potassium (K I) resonance doublets, have long been predicted in the optical atmospheric spectra of cloud-free irradiated gas giant exoplanets1-3. ...