Femtometer-resolved simultaneous measurement of multiple laser wavelengths in a speckle wavemeter

by Graham Bruce | Oct 30, 2019 | In Press

Graham D. Bruce, Laura O’Donnell, Mingzhou Chen, Morgan Facchin and Kishan Dholakia https://arxiv.org/abs/1910.13411 Many areas of optical science require an accurate measurement of optical spectra. Devices based on laser speckle promise compact wavelength...

Deep learning enabled laser speckle wavemeter with a high dynamic range

by Graham Bruce | Oct 25, 2019 | In Press

Roopam K. Gupta, Graham D. Bruce, Simon J. Powis and Kishan Dholakia https://arxiv.org/abs/1910.10702 The speckle pattern produced when a laser is scattered by a disordered medium has recently been shown to give a surprisingly accurate or broadband measurement of...

High speed determination of laser wavelength using Poincaré descriptors of speckle

by Graham Bruce | Sep 5, 2019 | 2020, Publications

Laura O’Donnell, Kishan Dholakia and Graham D. Bruce Opt. Commun. 459, 124906 (2020) / arXiv: 1908.00665 Laser speckle can provide a powerful tool that may be used for metrology, for example measurements of the incident laser wavelength with a resolution beyond...

Optimal compressive multiphoton imaging at depth using single-pixel detection

by Graham Bruce | Jul 16, 2019 | 2019, Publications

Philip Wijesinghe, Adrià Escobet-Montalbán, Mingzhou Chen, Peter R T Munro and Kishan Dholakia Opt. Lett. 44(20), 4981-4984 (2019) doi: 10.1364/OL.44.004981 Compressive sensing can overcome the Nyquist criterion and record images with a fraction of the usual number of...

A new twist for materials science: The formation of chiral structures using the angular momentum of light

by Graham Bruce | Jul 5, 2019 | 2019

Takashige Omatsu, Katsuhiko Miyamoto, Kohei Toyoda, Ryuji Morita, Yoshihiko Arita and Kishan Dholakia Advanced Optical Materials 7, 1801672 (2019) doi: 10.1002/adom.201801672 Recent work has shown that irradiation with light possessing orbital angular momentum (OAM)...

Label-free optical hemogram of granulocytes enhanced by artificial neural networks

by Jonathan Nylk | Apr 1, 2019 | 2019

Roopam K. Gupta, Mingzhou Chen, Graeme P. A. Malcolm, Nils Hempler, Kishan Dholakia and Simon J. Powis Optics Express 27(10), 13706-13720 (2019) doi: 10.1364/OE.27.013706 An outstanding challenge for immunology is the classification of immune cells in a label-free...