Dr. Mingzhou Chen Profile

Dr. Mingzhou Chen

Postdoc Research Scientist at Univ of St Andrews

Area of Expertise:

Singular Opitcs , Raman spectroscopy , Opitcal vortex , Optical Tweezers

Publications (21)

Proceedings Article | 11 August 2023 Paper

Enhanced contrast in optical coherence tomography using multiple scattering

Gavrielle Untracht, Mingzhou Chen, Philip Wijesinghe, Joesp Mas, Harold Yura, Dominik Marti, Peter Andersen, Kishan Dholakia

Proceedings Volume 12632, 126321G (2023) https://doi.org/10.1117/12.2670209

KEYWORDS: Optical coherence tomography, Multiple scattering, Signal attenuation, Microscopy, Image contrast enhancement, Biomedical optics, Scattered light, Optical microscopy, Interference (communication), Image enhancement

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Proceedings Article | 9 March 2023 Presentation

Through the looking glass: Raman spectroscopy of concealed samples in sealed containers using shaped laser light

Graham Bruce, Georgina Shillito, Lewis McMillan, George Dwapanyin, Mingzhou Chen, Kishan Dholakia

Proceedings Volume PC12428, PC1242807 (2023) https://doi.org/10.1117/12.2649738

KEYWORDS: Raman spectroscopy, Glasses, Statistical analysis, Chemical analysis, Visualization, Visual analytics, Opacity, Nondestructive evaluation, Magnetic resonance imaging, Light scattering

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SPIE Journal Paper | 17 May 2021 Open Access

Optical trapping with structured light: a review

Yuanjie Yang, Yuxuan Ren, Mingzhou Chen, Yoshihiko Arita, Carmelo Rosales-Guzmán

AP, Vol. 3, Issue 03, 034001, (May 2021) https://doi.org/10.1117/12.10.1117/1.AP.3.3.034001

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Proceedings Article | 10 March 2020 Presentation

High throughput label-free optical hemogram of granulocytes enhanced by artificial neural networks (Conference Presentation)

Roopam Gupta, Mingzhou Chen, Graeme Malcolm, Nils Hempler, Kishan Dholakia, Simon Powis

Proceedings Volume 11250, 112500X (2020) https://doi.org/10.1117/12.2544563

KEYWORDS: Artificial neural networks, Principal component analysis, Raman spectroscopy, Digital holography, Inflammation, Molecules, Flow cytometry, Magnetism, Holography, Microscopy

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Proceedings Article | 4 March 2019 Presentation

Spatially offset optical coherence tomography (Conference Presentation)

Mingzhou Chen, Phillip Wijesinghe, Josep Mas, Kishan Dholakia

Proceedings Volume 10890, 1089017 (2019) https://doi.org/10.1117/12.2508356

KEYWORDS: Optical coherence tomography, Speckle, Photons, Image contrast enhancement, Coherence (optics), Signal detection, Scattering, Image enhancement, Image quality

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Proceedings Article | 22 February 2019 Presentation + Paper

Wide-field multiphoton imaging with TRAFIX

Adrià Escobet-Montalbán, Philip Wijesinghe, Mingzhou Chen, Kishan Dholakia

Proceedings Volume 10882, 108821G (2019) https://doi.org/10.1117/12.2508373

KEYWORDS: Multiphoton fluorescence microscopy, Multiphoton microscopy, Two photon excitation microscopy, Two photon imaging, Scattering, Compressed sensing, Scattering media, Microscopy, Microscopes, Luminescence, Objectives, Light scattering, Laser scattering, Spatial light modulators

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Proceedings Article | 14 March 2018 Presentation

Levitated optomechanics of silica microparticles in vacuum placed in 2D and 3D optical potentials possessing orbital angular momentum (Conference Presentation)

Yoshihiko Arita, Michael Mazilu, Mingzhou Chen, Tom Vettenburg, Juan Aunon, Ewan Wright, Kishan Dholakia

Proceedings Volume 10549, 105491B (2018) https://doi.org/10.1117/12.2290534

KEYWORDS: Particles, Optomechanical design, Silica, Fourier transforms, Bessel beams, Beam propagation method, 3D image processing, Laser scattering, Scattering, Optical tracking

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Proceedings Article | 14 March 2018 Presentation

A femtometer-resolved all-fiber speckle wavemeter (Conference Presentation)

Graham Bruce, Mingzhou Chen, Kishan Dholakia

Proceedings Volume 10549, 105490N (2018) https://doi.org/10.1117/12.2289636

KEYWORDS: Speckle, Chemical species, Speckle pattern, Laser stabilization, Principal component analysis, Speckle metrology, Optical metrology, Prisms, Integrating spheres, Spectrometers

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Proceedings Article | 19 April 2017 Presentation

Combining Raman spectroscopy and digital holographic microscopy for label-free classification of human immune cells (Conference Presentation)

Naomi McReynolds, Fiona G. Cooke, Mingzhou Chen, Simon Powis, Kishan Dholakia

Proceedings Volume 10057, 100570A (2017) https://doi.org/10.1117/12.2250505

KEYWORDS: Holography, Microscopy, Chemical analysis, Clinical research, Nondestructive evaluation, Physics, Astronomy, Medicine, Raman spectroscopy, Digital holography

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Proceedings Article | 18 April 2017 Paper

Dynamics of optically levitated microparticles in vacuum placed in 2D and 3D optical potentials possessing orbital angular momentum

Yoshihiko Arita, Michael Mazilu, Mingzhou Chen, Tom Vettenburg, Juan Auñón, Ewan Wright, Kishan Dholakia

Proceedings Volume 10252, 102520V (2017) https://doi.org/10.1117/12.2275309

KEYWORDS: Particles, Astronomical imaging, Integrated optics, Fourier transforms, Bessel beams, 3D image processing, Silica, Laser scattering, Scattering, Optical tracking, Optical tweezers

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We demonstrate the transfer of orbital angular momentum to optically levitated microparticles in vacuum [1]. We prepare two-dimensional and three-dimensional optical potentials. In the former case the microparticle is placed within a Laguerre-Gaussian beam and orbits the annular beam profile with increasing angular velocity as the air drag coefficient is reduced. We explore the particle dynamics as a function of the topological charge of the levitating beam. Our results reveal that there is a fundamental limit to the orbital angular momentum that may be transferred to a trapped particle, dependent upon the beam parameters and inertial forces present. This effect was predicted theoretically [2] and can be understood considering the underlying dynamics arising from the link between the magnitude of the azimuthal index and the beam radius [3]. Whilst a Laguerre-Gaussian beam scales in size with azimuthal index `, recently we have created a “perfect” vortex beam whose radial intensity profile and radius are both independent of topological charge [4, 5]. As the Fourier transform of a perfect vortex yields a Bessel beam. Imaging a perfect vortex, with its subsequent propagation thus realises a complex three dimensional optical field. In this scenario we load individual silica microparticles into this field and observe their trajectories. The optical gradient and scattering forces interplay with the inertial and gravitational forces acting on the trapped particle, including the rotational degrees of freedom. As a result the trapped microparticle exhibits a complex three dimensional motion that includes a periodic orbital motion between the Bessel and the perfect vortex beam. We are able to determine the three dimensional optical potential in situ by tracking the particle. This first demonstration of trapping microparticles within a complex three dimensional optical potential in vacuum opens up new possibilities for fundamental studies of many-body dynamics, mesoscopic entanglement [6, 7], and optical binding [8, 9].

Proceedings Article | 18 April 2017 Paper

Wavefront correction enables vibrational imaging of bacteria with multimode fibre probes

Ivan Gusachenko, Mingzhou Chen, Kishan Dholakia

Proceedings Volume 10251, 1025104 (2017) https://doi.org/10.1117/12.2274974

KEYWORDS: Raman spectroscopy, Wavefronts, Multimode fibers, Bacteria, Spatial light modulators, Endoscopy, Imaging spectroscopy, Microscopy, Light scattering, Biomedical optics

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Proceedings Article | 10 November 2016 Presentation

Can integer and fractional optical vortices produce equally smooth optical manipulation? (Conference Presentation)

Georgiy Tkachenko, Mingzhou Chen, Kishan Dholakia, Michael Mazilu

Proceedings Volume 9922, 99220Q (2016) https://doi.org/10.1117/12.2239408

KEYWORDS: Optical vortices, Quantization, Wavefronts, Particles, Optical manipulation, Wave propagation, Spiral phase plates, Optical tweezers, Optical micromanipulation, Current controlled current source

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Proceedings Article | 16 September 2014 Paper

Optical trapping with a perfect vortex beam

Mingzhou Chen, Michael Mazilu, Yoshihiko Arita, Ewan Wright, Kishan Dholakia

Proceedings Volume 9164, 91640K (2014) https://doi.org/10.1117/12.2064080

KEYWORDS: Particles, Spatial light modulators, Optical tweezers, Wavefronts, Microscopes, Video, Molybdenum, Polymers, Chemical species, Gases

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Proceedings Article | 11 September 2012 Paper

Experimental observation of speckle transition

Mingzhou Chen, Chris Dainty

Proceedings Volume 8413, 841303 (2012) https://doi.org/10.1117/12.978222

KEYWORDS: Speckle, Spiral phase plates, Wavefronts, Spatial light modulators, Optical vortices, Phase measurement, CCD cameras, Fringe analysis, Light wave propagation, Wavefront sensors

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Proceedings Article | 21 September 2011 Paper

Reflections on speckle: old and new results

Christopher Dainty, Mingzhou Chen

Proceedings Volume 8122, 81220F (2011) https://doi.org/10.1117/12.895197

KEYWORDS: Speckle, Speckle pattern, Holography, Adaptive optics, Stars, Electronics, Optical simulations, Cameras, Physics, Temporal coherence

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Proceedings Article | 16 September 2011 Paper

Evolution of vortex density in a non-diffracting speckle field with its continuous phase removed

Mingzhou Chen, Chris Dainty

Proceedings Volume 8171, 817104 (2011) https://doi.org/10.1117/12.896820

KEYWORDS: Speckle, Spiral phase plates, Optical vortices, Scintillation, Wave propagation, Wavefronts, Diffraction, Bessel beams, Fourier transforms, Adaptive optics

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Proceedings Article | 12 October 2010 Paper

Study of turbulence effects for a free-space optical link over water

Ruth Mackey, Mingzhou Chen, Andrew Lambert, David Mackey, Alexander Goncharov

Proceedings Volume 7828, 782808 (2010) https://doi.org/10.1117/12.864689

KEYWORDS: Turbulence, Light emitting diodes, Point spread functions, Image analysis, Ocean optics, Relays, Free space optics, Adaptive optics, Telescopes, Data communications

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Proceedings Article | 1 October 2009 Paper

Reliability of detecting optical vortex with a Shack-Hartmann wavefront sensor in a scintillated vortex beam

Mingzhou Chen, Chris Dainty

Proceedings Volume 7476, 74760N (2009) https://doi.org/10.1117/12.829501

KEYWORDS: Wavefront sensors, Atmospheric propagation, Optical vortices, Wave propagation, Beam propagation method, Reliability, Spiral phase plates, Free space optical communications, Telecommunications, Turbulence

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SPIE Journal Paper | 1 June 2002

Fully automatic algorithm for region of interest location in camera calibration

Xinyu Kou, Zhong Wang, Mingzhou Chen, Shenghua Ye

OE, Vol. 41, Issue 06, (June 2002) https://doi.org/10.1117/12.10.1117/1.1476327

KEYWORDS: Calibration, Detection and tracking algorithms, Cameras, Radon transform, Zoom lenses, Optical engineering, Visualization, Algorithm development, Image processing, Machine vision

Proceedings Article | 25 September 2001 Paper

Ways-free registration method and its application in 3D data fusion

Xinyu Kou, Zhong Wang, Mingzhou Chen, Shenghua Ye

Proceedings Volume 4553, (2001) https://doi.org/10.1117/12.441592

KEYWORDS: Image registration, Data fusion, Inspection, 3D image processing, 3D metrology, Calibration, 3D applications, Imaging systems, Cameras, Image fusion

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Proceedings Article | 20 September 2001 Paper

Grid-code-based fast matching method in active binocular vision

Mingzhou Chen, Zhong Wang, Xinyu Kou, Shenghua Ye

Proceedings Volume 4552, (2001) https://doi.org/10.1117/12.441534

KEYWORDS: Cameras, CCD cameras, Machine vision, 3D image processing, Imaging systems, Ytterbium, Visual process modeling, Image segmentation, Fluctuations and noise, Projection systems

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Showing 5 of 21 publications

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