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54 papers
Controlled transfer of transverse optical angular momentum to optically trapped birefringent particles
Alexander B. Stilgoe, Timo A. Nieminen, Halina Rubinsztein-Dunlop
We report on the observation and measurement of the transfer of transverse angular momentum to birefringent particles several wavelengths in size. A trapped birefringent particle i…
Machine learning reveals complex behaviours in optically trapped particles
Isaac C. D. Lenton, Giovanni Volpe, Alexander B. Stilgoe +2
Since their invention in the 1980s [1], optical tweezers have found a wide range of applications, from biophotonics and mechanobiology to microscopy and optomechanics [2, 3, 4, 5].…
OTSLM Toolbox for Structured Light Methods
Isaac C D Lenton, Alexander B Stilgoe, Timo A Nieminen +1
We present a new Matlab toolbox for generating phase and amplitude patterns for digital micro-mirror device (DMD) and liquid crystal (LC) based spatial light modulators (SLMs). Thi…
Orientation of Swimming Cells with Annular Beam Optical Tweezers
Isaac C. D. Lenton, Declan J. Armstrong, Alexander B. Stilgoe +2
Optical tweezers are a versatile tool that can be used to manipulate small particles including both motile and non-motile bacteria and cells. The orientation of a non-spherical par…
Wall effects of eccentric spheres machine learning for convenient computation
Lachlan J. Gibson, Shu Zhang, Alexander B. Stilgoe +2
In confined systems, such as the inside of a biological cell, the outer boundary or wall can affect the dynamics of internal particles. In many cases of interest both the internal…
Solar Line Asymmetries: Modelling the Effect of Granulation on the Solar Spectrum
Timo A. Nieminen
A parametric model of granulation employing a small number of parameters was developed. Synthetic spectra calculated using this model closely match observed spectra and, in particu…