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625 results on '"Booth, Martin J."'

106. Robust measurement of flexoelectro-optic switching with different surface alignments.

Author

Sandford O'Neill, John J., Fells, Julian A. J., Welch, Chris, Mehl, Georg, Yip, Wing C., Wilkinson, Timothy D., Booth, Martin J., Elston, Steve J., and Morris, Stephen M.

Subjects
NEMATIC liquid crystals, OPTICAL switching, ELECTRIC dipole transitions, DIELECTRIC properties, PERMITTIVITY, ELECTROOPTICS
Abstract

The alignment of chiral nematic liquid crystals in the so-called uniform lying helix geometry allows for the observation and exploitation of the flexoelectro-optic effect. However, high-quality uniform lying helix alignment is difficult to achieve reliably, and this can potentially impact the accuracy of the measurements made on the flexoelectro-optic switching behaviour. Here, we show that, using an appropriate method, it is possible to make measurements of the flexo-electric coefficients that are not substantially influenced by the alignment quality. [ABSTRACT FROM AUTHOR]

Published
2019
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109. Microscope-Cockpit: Python-based bespoke microscopy for bio-medical science

Author

Phillips, Mick A., primary, Susano Pinto, David Miguel, additional, Hall, Nicholas, additional, Mateos-Langerak, Julio, additional, Parton, Richard M., additional, Titlow, Josh, additional, Stoychev, Danail V., additional, Parks, Thomas, additional, Susano Pinto, Tiago, additional, Sedat, John W., additional, Booth, Martin J., additional, Davis, Ilan, additional, and Dobbie, Ian M., additional

Published
2022
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114. Multielement Polychromatic 2D Liquid Crystal Dammann Gratings.

Author

Zhao, Zimo, Chen, Bohan, Salter, Patrick S., Booth, Martin J., O'Brien, Dominic, Elston, Steve J., and Morris, Stephen M.

Subjects
NEMATIC liquid crystals, OPTICAL devices, MICROSCOPY, DIFFRACTION patterns, OPTICAL communications, LIQUID crystals, HOLOGRAPHIC gratings
Abstract

Multielement and multiwavelength switchable Dammann gratings are demonstrated in polymerizable nematic liquid crystal (LC) devices fabricated using two‐photon polymerization direct laser writing. To begin with, a single element 2D Dammann grating, with a diffraction efficiency of around 60%, is fabricated in a thin polymerizable LC layer such that the grating could be activated and deactivated with the application and removal of an external applied voltage. The impact of the fabrication parameters on the resulting intensity distribution in the far‐field diffraction pattern is presented and discussed, along with results for the response times, which are found to be less than that recorded for the regions of the LC device that did not consist of the laser‐written grating. A multielement device is then presented that exhibits two different Dammann gratings that are activated by the application of two different voltage amplitudes. Results for the corresponding far‐field intensity profiles and response times are presented, which demonstrate that high quality laser written switchable Dammann gratings can be fabricated in polymerizable LCs. These switchable elements have potential in programmable beam shaping, microscopy and optical communication devices. [ABSTRACT FROM AUTHOR]

Published
2023
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122. Wavefront‐sensorless adaptive optics with a laser‐free spinning disk confocal microscope.

Author

Hussain, Syed Asad, Kubo, Toshiki, Hall, Nicholas, Gala, Dalia, Hampson, Karen, Parton, Richard, Phillips, Mick A., Wincott, Matthew, Fujita, Katsumasa, Davis, Ilan, Dobbie, Ian, and Booth, Martin J.

Subjects
ADAPTIVE optics, MICROSCOPES, OPTICAL aberrations, REFRACTIVE index, MICROSCOPY
Abstract

Adaptive optics is being applied widely to a range of microscopies in order to improve imaging quality in the presence of specimen‐induced aberrations. We present here the first implementation of wavefront‐sensorless adaptive optics for a laser‐free, aperture correlation, spinning disk microscope. This widefield method provides confocal‐like optical sectioning through use of a patterned disk in the illumination and detection paths. Like other high‐resolution microscopes, its operation is compromised by aberrations due to refractive index mismatch and variations within the specimen. Correction of such aberrations shows improved signal level, contrast and resolution. [ABSTRACT FROM AUTHOR]

Published
2022
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124. List of Contributors

Author

Axelrod, Daniel, primary, Bokstad, Melanie, additional, Booth, Martin J., additional, Borejdo, Julian, additional, Cambi, Alessandra, additional, Colombelli, Julien, additional, Ertürk, Ali, additional, Fornasiero, Eugenio F., additional, Han, Sung-Sik, additional, Jaffrey, Samie R., additional, Jung, Min-Kyo, additional, de Keijzer, Sandra, additional, Kim, Jun-Sung, additional, Lin, Lynlee L., additional, Liu, Er, additional, Lorenzo, Corinne, additional, Medalia, Ohad, additional, Meddens, Marjolein B.M., additional, Nolan, John P., additional, Opazo, Felipe, additional, Pack, Chan-Gi, additional, Patton, Brian R., additional, Peterson, Daniel A., additional, Pike, Jeremy, additional, Prow, Tarl W., additional, Rappoport, Joshua Z., additional, Rego, E. Hesper, additional, Sako, Yasushi, additional, Shao, Lin, additional, Small, Alex, additional, Song, Mi-Roung, additional, Stahlheber, Shane, additional, Strack, Rita L., additional, Thorley, Jennifer A., additional, and Yamada, Miko, additional

Published
2014
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127. Microscope-Cockpit: Python-based bespoke microscopy for bio-medical science

Author

Phillips, Mick A., primary, Susano Pinto, David Miguel, additional, Hall, Nicholas, additional, Mateos-Langerak, Julio, additional, Parton, Richard M., additional, Titlow, Josh, additional, Stoychev, Danail V., additional, Parks, Thomas, additional, Susano Pinto, Tiago, additional, Sedat, John W., additional, Booth, Martin J., additional, Davis, Ilan, additional, and Dobbie, Ian M., additional

Published
2021
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128. 3D super-resolution deep-tissue imaging in living mice

Author

Velasco, Mary Grace M., primary, Zhang, Mengyang, additional, Antonello, Jacopo, additional, Yuan, Peng, additional, Allgeyer, Edward S., additional, May, Dennis, additional, M’Saad, Ons, additional, Kidd, Phylicia, additional, Barentine, Andrew E. S., additional, Greco, Valentina, additional, Grutzendler, Jaime, additional, Booth, Martin J., additional, and Bewersdorf, Joerg, additional

Published
2021
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132. Practical Implementation of Adaptive Optical Microscopes

Author

Hampson, Karen Mary, Žurauskas, Mantas, Barbotin, Aurélien, Booth, Martin J., Booth, M. J., and Wincott, M. B.

Subjects
Microscopy, ComputingMethodologies_IMAGEPROCESSINGANDCOMPUTERVISION, Adaptive optics, GeneralLiterature_MISCELLANEOUS
Abstract

This tutorial presents guidelines that will help in the design and implementation of adaptive opticssystems for microscopes.

Published
2020
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133. svmPSF quickstart manual

Author

Turcotte, Raphaël, Schmidt, Carla C., Emptage, Nigel J., Booth, Martin J., Raphaël Turcotte, Carla C. Schmidt, Nigel J. Emptage, and Martin J. Booth

Subjects
spatially variant deconvolution, PSF modeling, multimode fibre, micro-endoscopy
Abstract

This user manual explains how to install and use the svmPSF plugins for Fiji/ImageJ. The svmPSF plugin models a spatially variant PSF into a series of spatially invariant PSFs for image deconvolution.

Published
2020
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134. Protocol for imaging through a multimode optical fibre

Author

Turcotte, Raphaël, Emptage, Nigel J., Booth, Martin J., Raphaël Turcotte, Nigel J. Emptage, and Martin J. Booth

Subjects
adaptive optics, wavefront control, multimode fibre, micro-endoscopy, imaging
Abstract

This experimental protocol describes several procedures related to the operation of an imaging system based on wavefront control and step-index multimode optical fibres (MMFs). It is assumed that such an imaging system is already built and aligned, without an MMF. This protocol aims at providing guidance to new users of the system.

Published
2020
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135. Two-photon fluorescence imaging of live neurons using a multimode optical fiber

Author

Turcotte, Raphaël, Schmidt, Carla C., Booth, Martin J., and Emptage, Nigel J.

Abstract

An ability to optically visualize neurons and their subcellular components across brain regions is integral to our understanding of neuronal function 1 . Multimode optical fibers (MMFs), combined with wavefront control methods, have achieved minimally-invasive in vivo imaging of neurons in deep-brain regions with diffraction-limited spatial resolution 2–5 . To date MMF systems have been based on linear fluorescence and are therefore only able to perform two-dimensional imaging due to an absence of confocal filtering6. Here we report a method to achieve optical sectioning in live brain tissue by taking advantage of the nonlinearity of two-photon excited fluorescence (TPEF). In addition, we provide a new approach for the determination of transmission matrix for TPEF, a necessary step for the light shaping requirement of MMF imaging. Central to these advances is the use of a laser source able to generate both continuous wave (CW) light and femtosecond pulses. This configuration allows the system to be compact with minimal distal optics, enhancing suitability for neuroscience applications. With our system we demonstrate TPEF imaging of neurons and their dendrites in live brain slices through a single 60 μm-core MMF with a numerical aperture of 0.37. Taken together these developments represent an important step towards three-dimensional (3D) deep-brain imaging in vivo .

Published
2020
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136. A Compact Full 2 pi Flexoelectro-Optic Liquid Crystal Phase Modulator

Author

Wang, Xiuze, Wang, Xiuze, Fells, Julian AJ, Shi, Yuping, Ali, Taimoor, Welch, Chris, Mehl, Georg H, Wilkinson, Timothy D, Booth, Martin J, Morris, Stephen M, Elston, Steve J, Wang, Xiuze, Wang, Xiuze, Fells, Julian AJ, Shi, Yuping, Ali, Taimoor, Welch, Chris, Mehl, Georg H, Wilkinson, Timothy D, Booth, Martin J, Morris, Stephen M, and Elston, Steve J

Published
2020

138. Microscope-Cockpit: Python-based bespoke microscopy for bio-medical science

Author

Phillips, Mick A, primary, Pinto, David Miguel Susano, additional, Hall, Nicholas, additional, Mateos-Langerak, Julio, additional, Parton, Richard M, additional, Titlow, Josh, additional, Stoychev, Danail V, additional, Parks, Thomas, additional, Pinto, Tiago Susano, additional, Sedat, John W, additional, Booth, Martin J, additional, Davis, Ilan, additional, and Dobbie, Ian M, additional

Published
2021
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143. Implementation of a 4Pi-SMS super-resolution microscope

Author

Wang, Jingyu, primary, Allgeyer, Edward S., additional, Sirinakis, George, additional, Zhang, Yongdeng, additional, Hu, Kevin, additional, Lessard, Mark D., additional, Li, Yiming, additional, Diekmann, Robin, additional, Phillips, Michael A., additional, Dobbie, Ian M., additional, Ries, Jonas, additional, Booth, Martin J., additional, and Bewersdorf, Joerg, additional

Published
2020
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145. Active aberration correction for the writing of three-dimensional optical memory devices

Author

Neil, Mark A.A., Juskaitis, Rimas, Booth, Martin J., Wilson, Tony, Tanaka, Tomokazu, and Kawata, Satoshi

Subjects
Optics -- Usage, Memory (Computers) -- Research, Astronomy, Physics
Abstract

We describe an active optical system that both measures and corrects the aberrations introduced when writing three-dimensional bit-oriented optical memory by a two-photon absorption process. The system uses a ferroelectric liquid-crystal spatial light modulator (FLCSLM) configured as an arbitrary wave-front generator that is reconfigurable at speeds as great as 2.5 kHz. A method of aberration measurement by the FLCSLM wave-front generator is described. The same device is also used to correct the induced aberrations by preshaping the wave fronts with the conjugate phase aberration as well as to scan the focal spot in three dimensions. Experimental results show the correction of both on- and off-axis aberrations, allowing the writing of data at depths as great as 1 mm inside a LiNb[O.sub.3] crystal. OCIS codes: 210.4680, 210.2860, 010.1080, 220.1000, 230.6120.

Published
2002

146. 3D Adaptive Optical Nanoscopy for Thick Specimen Imaging at sub-50 nm Resolution

Author

Hao, Xiang, primary, Allgeyer, Edward S., additional, Antonello, Jacopo, additional, Watters, Katherine, additional, Gerdes, Julianne A., additional, Schroeder, Lena K., additional, Bottanelli, Francesca, additional, Zhao, Jiaxi, additional, Kidd, Phylicia, additional, Lessard, Mark D., additional, Rothman, James E., additional, Cooley, Lynn, additional, Biederer, Thomas, additional, Booth, Martin J., additional, and Bewersdorf, Joerg, additional

Published
2020
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