Results 91 to 100 of about 50,323 (284)

Computational de-noising based on deep learning for phase data in digital holographic interferometry

APL Photonics, 2020
This paper presents a deep-learning-based algorithm dedicated to the processing of speckle noise in phase measurements in digital holographic interferometry.
Silvio Montresor, Marie Tahon, Antoine Laurent, Pascal Picart   +3 more
doaj   +1 more source

Nature of light correlations in ghost imaging

, 2012
We investigate the nature of correlations in Gaussian light sources used for ghost imaging. We adopt methods from quantum information theory to distinguish genuinely quantum from classical correlations. Combining a microscopic analysis of speckle-speckle
A Ferraro, A Ferraro, A Gatti, A Gatti, A Valencia, AF Abouraddy, BI Erkmen, BI Erkmen, DV Strekalov, E Brambilla, F Ferri, G Adesso, G Adesso, G Brida, G Scarcelli, H Ollivier, HP Yuen, L Henderson, LS Madsen, MH Rubin, MN O’Sullivan, P Giorda, P Marian, RE Meyers, RS Bennink, RS Bennink, TB Pittman, Z Merali   +27 more
core   +1 more source

Microscopic Insights into Magnetic Warping and Time‐Reversal Symmetry Breaking in Topological Surface States of Rare‐Earth‐Doped Bi2Te3

Advanced Materials, EarlyView.
Magnetic doping of the topological insulator Bi2Te3 with erbium adatoms induces out‐of‐plane magnetism and breaks time‐reversal symmetry, opening a Dirac gap and driving a Fermi surface transition from hexagonal to star‐of‐David geometry. Microscopy, spectroscopy, and magnetic dichroism reveal atomically controlled magnetic interactions that tailor the
Beatriz Muñiz Cano, Fabián Calleja, Ji Dai, Massimo Tallarida, Vera Marinova, Alessandro Barla, Marc G. Cuxart, Pierluigi Gargiani, Gonzalo N. Molina, José Angel Silva‐Guillén, Adriana I. Figueroa, Kevin García‐Díez, Sergio O. Valenzuela, Aitor Mugarza, Amadeo L. Vázquez de Parga, Rodolfo Miranda, Francisco Guinea, Manuela Garnica, Miguel A. Valbuena   +18 more
wiley   +1 more source

Simultaneous ultra-high contrast imaging and determination of time-dependent, non-common path aberrations in the presence of detector noise

, 2014
Ground-based ultra-high contrast imaging, as required for direct imaging of exoplanets and other solar systems, is limited by difficulty of separating the planetary emission from the effects of optical aberrations that are not compensated by the adaptive
Frazin, Richard A.
core   +1 more source

Flexible Dielectric Acoustic Resonator Patch for Tissue Regeneration

Advanced Materials, EarlyView.
A flexible dielectric acoustic resonator patch enables MHz‐range ultrasound generation through resonance amplification without using piezoelectric materials. Conformal integration on a curved substrate allows efficient acoustic delivery to tissue‐mimicking environments.
Donyoung Kang, Byeongseok Ryu, Sujeong Ahn, Junhyub Kim, Myeonghun Jang, Jeong Ho Cho, Won‐Gun Koh, Hyungsuk Lee   +7 more
wiley   +1 more source

Is Speckle Noise More Challenging to Mitigate Than Additive Noise?

IEEE Transactions on Information Theory
We study the problem of estimating a function in the presence of both speckle and additive noises, commonly referred to as the de-speckling problem. Although additive noise has been thoroughly explored in nonparametric estimation, speckle noise, prevalent in applications such as synthetic aperture radar, ultrasound imaging, and digital holography, has ...
Reihaneh Malekian, Hao Xing, Arian Maleki   +2 more
openaire   +2 more sources

Towards Multi-Directional OCT for Speckle Noise Reduction [PDF]

, 2008
Multi-directional optical coherence tomography (MD-OCT) applies and extends the concept of angular compounding for speckle noise reduction to the area of OCT imaging. OCT images are acquired from a wide range of angles of view. Averaging of the rotated images therefore requires compensation of the parallax which is achieved by simple image registration
L, Ramrath, G, Moreno, H, Mueller, T, Bonin, G, Huettmann, A, Schweikard   +5 more
openaire   +2 more sources

Fluctations and noise in time-resolved light scattering experiments : measuring temporally heterogeneous dynamics

, 2004
We use Time Resolved Correlation (TRC), a recently introduced light scattering method, to study the dynamics of a variety of jammed, or glassy, soft materials.
Ballesta, Pierre, Bissig, Hugo, Cipelletti, Luca, Duri, Agnes, Trappe, Veronique   +4 more
core   +4 more sources

Digital Microneedles for Multiplexed Transdermal Sensing via Fluorescent QR Codes

Advanced Materials, EarlyView.
Digital fluorescent microneedles encode biochemical information in skin into scannable QR codes through threshold‐activated probes that generate binary on/off signals. By transforming analog fluorescence into discrete digital patterns, this platform enables calibration‐free, multiplexed transdermal sensing of physiologically relevant biomarkers ...
Farbod Abazar, Shahrokh Vahabi, Elena Bellotti, Martina Corsi, Irene Nocera, Paola Orlandi, Guido Bocci, Giuseppe Barillaro   +7 more
wiley   +1 more source

Performance of the SOAR Speckle Instrument

The Astronomical Journal
The High Resolution Camera (HRCam) speckle imager at the 4.1 m Southern Astrophysical Research telescope is a highly productive instrument that has accumulated about 40K observations to date.
Andrei Tokovinin
doaj   +1 more source