Spatially Resolved Spectroscopic Technique for Measuring Optical Properties of Food

2016 ◽  
pp. 159-185
Author(s):  
Haiyan Cen ◽  
Renfu Lu ◽  
Nghia Nguyen-Do-Trong ◽  
Wouter Saeys
Keyword(s):  
Optical Properties ◽  
Spectroscopic Technique ◽  
Spatially Resolved

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

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.

scholarly journals Metamodeling approach for efficient estimation of optical properties of turbid media from spatially resolved diffuse reflectance measurements

2013 ◽  
Vol 21 (26) ◽  
pp. 32630 ◽  
Author(s):  
Rodrigo Watté ◽  
Nghia Nguyen Do Trong ◽  
Ben Aernouts ◽  
Chyngyz Erkinbaev ◽  
Josse De Baerdemaeker ◽  
...  
Keyword(s):  
Optical Properties ◽  
Diffuse Reflectance ◽  
Efficient Estimation ◽  
Turbid Media ◽  
Spatially Resolved ◽  
Reflectance Measurements

Local Electronic Structure Of Defects In Gan From Spatially Resolved Electron Energy-Loss Spectroscopy

1997 ◽  
Vol 482 ◽  
Author(s):  
M. K. H. Natusch ◽  
G. A. Botton ◽  
R. F. Broom ◽  
P. D. Brown ◽  
D. M. Tricker ◽  
...  
Keyword(s):  
Optical Properties ◽  
Electronic Structure ◽  
Energy Loss ◽  
Electron Energy ◽  
Electron Energy Loss Spectroscopy ◽  
Crystal Defects ◽  
Vacuum Field ◽  
Spatially Resolved ◽  
Local Electronic Structure ◽  
Electron Energy Loss

AbstractThe optical properties and their modification by crystal defects of wurtzite GaN are investigated using spatially resolved electron energy-loss spectroscopy (EELS) in a dedicated ultra-high vacuum field emission gun scanning transmission electron microscope. The calculated density of states of the bulk crystal reproduces well the features of the measured spectra. The profound effect of a prismatic stacking fault on the local electronic structure is shown by the spatial variation of the optical properties derived from low-loss spectra. It is found that a defect state at the fault appears to bind 1.5 electrons per atom.

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