Results 41 to 50 of about 25,478 (173)

Light propagation and emission in complex photonic media [PDF]

, 2014
We provide an introduction to complex photonic media, that is, composite materials with spatial inhomogeneities that are distributed over length scales comparable to or smaller than the wavelength of light.
Lagendijk, Ad, Mosk, Allard P., Vos, Willem L.   +2 more
core   +2 more sources

Effect of vascular structure on laser speckle contrast imaging

Biomedical Optics Express, 2020
Laser speckle contrast imaging (LSCI) is a powerful tool for non-invasive, real-time imaging of blood flow in tissue. However, the effect of tissue geometry on the form of the electric field autocorrelation function and speckle contrast values is yet to be investigated.
Chakameh Z. Jafari, Colin T. Sullender, David R. Miller, Samuel A. Mihelic, Andrew K. Dunn   +4 more
openaire   +2 more sources

High-density speckle contrast optical tomography (SCOT) for three dimensional tomographic imaging of the small animal brain [PDF]

, 2017
High-density speckle contrast optical tomography (SCOT) utilizing tens of thousands of source-detector pairs, was developed for in vivo imaging of blood flow in small animals.
Culver, Joseph P, Dragojevic, Tanja, Durduran, Turgut, Hollmann, Joseph L, Justicia, Carles, Valdes, Claudia P, Varma, Hari M   +6 more
core   +3 more sources

Coherent Matrix-Based Approach for Evaluation of First-Order Speckle Intensity Statistics and Its Application for Speckle Suppression

IEEE Photonics Journal, 2022
The existing approach for evaluating the statistical characteristics of speckle intensity distribution is applicable only to completely decorrelated laser beams.
Qiyong Xu, Anatoliy Lapchuk, Zichun Le, Di Cai, Jun Zhou, Zongshen Liu, Ivan Gorbov, Andriy Kryuchyn   +7 more
doaj   +1 more source

Monitoring spatially heterogeneous dynamics in a drying colloidal thin film [PDF]

, 2010
We report on a new type of experiment that enables us to monitor spatially and temporally heterogeneous dynamic properties in complex fluids. Our approach is based on the analysis of near-field speckles produced by light diffusely reflected from the ...
Berne B.J., Breugem A.J., F. Scheffold, Goodman J.W., Lenke R., Lindner P., P. Zakharov, Skipetrov S.E., Weitz D.A.   +8 more
core   +2 more sources

Twente Optical Perfusion Camera: system overview and performance for video rate laser Doppler perfusion imaging [PDF]

, 2009
We present the Twente Optical Perfusion Camera (TOPCam), a novel laser Doppler Perfusion Imager based on CMOS technology. The tissue under investigation is illuminated and the resulting dynamic speckle pattern is recorded with a high speed CMOS camera ...
Draijer, Matthijs, Hondebrink, Erwin, Leeuwen, Ton van, Steenbergen, Wiendelt   +3 more
core   +4 more sources

Dual-Wavelength Confocal Laser Speckle Contrast Imaging Using a Deep Learning Approach

Photonics
This study developed a novel dual-wavelength confocal laser speckle imaging platform. The system includes both visible and near-infrared lasers and two imaging modes: confocal and wide-field laser speckle contrast imaging.
E Du, Haohan Zheng, Honghui He, Shiguo Li, Cong Qiu, Weifeng Zhang, Guoqing Wang, Xingquan Li, Lan Ma, Shuhao Shen, Yuan Zhou   +10 more
doaj   +1 more source

Normalized ghost imaging [PDF]

, 2012
We present an experimental comparison between different iterative ghost imaging algorithms. Our experimental setup utilizes a spatial light modulator for generating known random light fields to illuminate a partially-transmissive object.
Baoqing Sun, Bennink, Bromberg, Donoho, Duarte, Ferri, Ferri, Gatti, Gatti, Jeffrey H. Shapiro, Katz, Matthew P. Edgar, Miles J. Padgett, Shapiro, Stephen S. Welsh, Valencia   +15 more
core   +3 more sources

The dependence of speckle contrast on velocity: a numerical study

Journal of the European Optical Society-Rapid Publications, 2022
We study how the speckle contrast depends on scatterer velocity, with the goal of further developing laser speckle imaging as a quantitative measurement technique. To that end, we perform interferometric computer simulations on a dilute plug flow.
van As Kevin, Simons Bram A., Kleijn Chris R., Kenjeres Sasa, Bhattacharya Nandini   +4 more
doaj   +1 more source

Laser Doppler holographic microscopy in transmission: application to fish embryo imaging [PDF]

, 2014
We have extended Laser Doppler holographic microscopy to transmission geometry. The technique is validated with living fish embryos imaged by a modified upright bio-microcope.
Alexandre, Daniel, Gross, Michel, Verrier, Nicolas   +2 more
core   +3 more sources