Results 11 to 20 of about 55,633 (211)

Application of spectral-focusing-CARS microscopy to pharmaceutical sample analysis

open access: yesAIP Advances, 2018
We implement spectral-focusing-CARS hyperspectroscopy to characterize pharmaceutical samples. The use of a dynamically-power-tuned supercontinuum seeding method combined with epi-detection of the CARS signals allows for broadband hyperspectroscopy and ...
J. G. Porquez, A. D. Slepkov
doaj   +1 more source

Generation and Direct Detection of Broadband Mesoscopic Polarization-Squeezed Vacuum [PDF]

open access: yes, 2009
Using a traveling-wave OPA with two orthogonally oriented type-I BBO crystals pumped by picosecond pulses, we generate vertically and horizontally polarized squeezed vacuum states within a broad range of wavelengths and angles.
A. P. Alodjants   +7 more
core   +1 more source

A match coefficient approach for damage imaging in structural components by ultrasonic synthetic aperture focus [PDF]

open access: yes, 2017
Ultrasonic Synthetic Aperture Focus (SAF) techniques are commonly used to image structural defects. In this paper, a variation of SAF based on ideas borrowed from Matched Field Processing (MFP) is evaluated to reduce artifacts and sidelobes of the ...
Lanza di Scalea, F.   +4 more
core   +1 more source

Improved Resolution and Reduced Clutter in Ultra-Wideband Microwave Imaging Using Cross-Correlated Back Projection: Experimental and Numerical Results

open access: yesInternational Journal of Biomedical Imaging, 2010
Microwave breast cancer detection is based on the dielectric contrast between healthy and malignant tissue. This radar-based imaging method involves illumination of the breast with an ultra-wideband pulse.
S. Jacobsen, Y. Birkelund
doaj   +1 more source

Improving Photoacoustic-guided Focusing in Scattering Media by Spectrally Filtered Detection

open access: yes, 2013
We experimentally and numerically study the potential of photoacoustic-guiding for light focusing through scattering samples via wavefront-shaping and iterative optimization.
Boccara, Claude   +5 more
core   +3 more sources

Temporal recompression through a scattering medium via a broadband transmission matrix

open access: yes, 2017
The transmission matrix is a unique tool to control light through a scattering medium. A monochromatic transmission matrix does not allow temporal control of broadband light.
de Aguiar, Hilton B.   +2 more
core   +1 more source

Theory of Two-Photon Interactions with Broadband Down-Converted Light and Entangled Photons [PDF]

open access: yes, 2007
When two-photon interactions are induced by down-converted light with a bandwidth that exceeds the pump bandwidth, they can obtain a behavior that is pulse-like temporally, yet spectrally narrow.
Dayan, Barak
core   +2 more sources

All fiber polarization insensitive detection for spectrometer based optical coherence tomography using optical switch

open access: yes, 2019
Polarization dependent image artifacts are common in optical coherence tomography imaging. Polarization insensitive detection scheme for swept source based optical coherence tomography systems is well established but is yet to be demonstrated for all ...
Otuya, D.   +3 more
core   +1 more source

Architectures and Key Technical Challenges for 5G Systems Incorporating Satellites [PDF]

open access: yes, 2018
Satellite Communication systems are a promising solution to extend and complement terrestrial networks in unserved or under-served areas. This aspect is reflected by recent commercial and standardisation endeavours. In particular, 3GPP recently initiated
Alagha, N.   +12 more
core   +3 more sources

High-efficiency broadband achromatic orbital-angular-momentum metalens for focusing and edge-enhanced imaging in mid-wavelength infrared

open access: yesResults in Physics
Edge-enhanced detection based on spiral phase contrast imaging driven by orbital angular momentum (OAM) of light, offers a promising way to obtain low-light-level signals.
Yijie Luo   +9 more
doaj   +1 more source

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