Estimation of the optical properties of two-layered tissue simulating phantoms from spatially resolved frequency-domain reflectance

1999 ◽  
Author(s):  
George Alexandrakis ◽  
Robert A. Weersink ◽  
Jody T. Bruulsema ◽  
Michael S. Patterson
Keyword(s):  
Optical Properties ◽  
Frequency Domain ◽  
Spatially Resolved ◽  
Tissue Simulating Phantoms

scholarly journals Impact of optical clearing on ex vivo human skin optical properties characterized by spatially resolved multimodal spectroscopy

2021 ◽  
Author(s):  
Sergey M. Zaytsev ◽  
Marine Amouroux ◽  
Grégoire Khairallah ◽  
Alexey N. Bashkatov ◽  
Valery V. Tuchin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Human Skin ◽  
Ex Vivo ◽  
Optical Clearing ◽  
Spatially Resolved

scholarly journals Assessment of the frequency-domain multi-distance method to evaluate the brain optical properties: Monte Carlo simulations from neonate to adult

2011 ◽  
Vol 2 (3) ◽  
pp. 552 ◽  
Author(s):  
Mathieu Dehaes ◽  
P. Ellen Grant ◽  
Danielle D. Sliva ◽  
Nadège Roche-Labarbe ◽  
Rudolph Pienaar ◽  
...  
Keyword(s):  
Monte Carlo ◽  
Optical Properties ◽  
Monte Carlo Simulations ◽  
Frequency Domain ◽  
Distance Method ◽  
The Brain

Optical Tomography With a Least Square Finite Element Formulation of the Collimated Irradiation in Frequency Domain

2010 ◽  
Author(s):  
Olivier Balima ◽  
Joan Boulanger ◽  
Andre´ Charette ◽  
Daniel Marceau
Keyword(s):  
Finite Element ◽  
Optical Properties ◽  
Frequency Domain ◽  
Complex Geometry ◽  
Numerical Study ◽  
Optical Tomography ◽  
Least Square ◽  
Finite Element Formulation ◽  
Element Formulation ◽  
Scattering Media

This paper presents a numerical study of optical tomography in frequency domain for the reconstruction of optical properties of scattering and absorbing media with collimated irradiation light sources. The forward model is a least square finite element formulation of the collimated irradiation problem where the intensity is separated into its collimated and scattered parts. This model does not use any empirical stabilization and moreover the collimated source direction is taken into account. The inversion uses a gradient type minimization method where the gradient is computed through an adjoint formulation. Scaling is used to avoid numerical round errors, as the output readings at detectors are very low. Numerical reconstructions of optical properties of absorbing and scattering media with simulated data (noised and noise-free) are achieved in a complex geometry with satisfactory results. The results show that complex geometries are well handled with the proposed method.

Spatially resolved optical emission of cubic GaN/AlN multi-quantum well structures

2014 ◽  
Vol 1736 ◽  
Author(s):  
D.J. As ◽  
R. Kemper ◽  
C. Mietze ◽  
T. Wecker ◽  
J.K.N. Lindner ◽  
...  
Keyword(s):  
Optical Properties ◽  
Low Temperature ◽  
Film Thickness ◽  
Quantum Wells ◽  
Emission Intensity ◽  
Optical Emission ◽  
Quantum Well Structures ◽  
Spatially Resolved ◽  
Scanning Transmission ◽  
Cubic Gan

ABSTRACTIn this contribution we report on the optical properties of cubic AlN/GaN asymmetric multi quantum wells (MQW) structures on 3C-SiC/Si (001) substrates grown by radio-frequency plasma-assisted molecular beam epitaxy (MBE). Scanning transmission electron microscopy (STEM) and spatially resolved cathodoluminescence (CL) at room temperature and at low temperature are used to characterize the optical properties of the cubic AlN/GaN MQW structures. An increasing CL emission intensity with increasing film thickness due to the improved crystal quality was observed. This correlation can be directly connected to the reduction of the linewidth of x-ray rocking curves with increasing film thickness of the c-GaN films. Defects like stacking faults (SFs) on the {111} planes, which also can be considered as hexagonal inclusions in the cubic crystal matrix, lead to a decrease of the CL emission intensity. With low temperature CL line scans also monolayer fluctuations of the QWs have been detected and the observed transition energies agree well with solutions calculated using a one-dimensional (1D) Schrödinger-Poisson simulator.

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