Polarized optical scattering measurements of metallic nanoparticles upon a silicon wafer

2009 ◽  
Author(s):  
Cheng-Yang Liu ◽  
Wei-En Fu
Keyword(s):  
Silicon Wafer ◽  
Metallic Nanoparticles ◽  
Optical Scattering ◽  
Scattering Measurements

Polarized Optical Scattering Measurements of Metallic Nanoparticles on a Thin Film Silicon Wafer

2009 ◽  
Author(s):  
Cheng-Yang Liu ◽  
Tze-An Liu ◽  
Wei-En Fu ◽  
Erik M. Secula ◽  
David G. Seiler ◽  
...  
Keyword(s):  
Thin Film ◽  
Silicon Wafer ◽  
Metallic Nanoparticles ◽  
Optical Scattering ◽  
Thin Film Silicon ◽  
Scattering Measurements

Characterization of Surface Micro-Roughness by Off-Specular Measurements of Polarized Optical Scattering

2019 ◽  
Vol 19 (6) ◽  
pp. 257-263
Author(s):  
Cheng-Yang Liu ◽  
Li-Jen Chang
Keyword(s):  
Surface Roughness ◽  
Light Intensity ◽  
Measurement System ◽  
Light Polarization ◽  
Optical Scattering ◽  
Metal Sheets ◽  
Scattering Measurements ◽  
Stepper Motors ◽  
Laser Sources

Abstract The characterization of surface micro-roughness is investigated by using off-specular measurements of polarized optical scattering. In the measurement system, the detection angles of optical scattering are defined by the vertical and level scattering angles. The rotating mechanism of angles is controlled by stepper motors. Waveplate and polarizer are used to adjust light polarization and detection. We conduct the optical scattering measurements by using four standard metal sheets of surface roughness. The nominal values (Ra) of standard micro-roughness are 1.6 μm, 0.8 μm, 0.4 μm, and 0.1 μm, respectively. Samples with different surface roughness are evaluated with the utilization of laser sources at three incident wavelengths. These polarized images are analyzed using a computer program to obtain the distribution of light intensity. The results show great correlation between the metal surface roughness and polarization states. This measurement system can be used to quickly and accurately distinguish between different surfaces and properties.

scholarly journals Optical scattering measurements and implications on thermal noise in Gravitational Wave detectors test-mass coatings

2018 ◽  
Vol 382 (33) ◽  
pp. 2259-2264 ◽  
Author(s):  
Lamar Glover ◽  
Michael Goff ◽  
Jignesh Patel ◽  
Innocenzo Pinto ◽  
Maria Principe ◽  
...  
Keyword(s):  
Gravitational Wave ◽  
Thermal Noise ◽  
Test Mass ◽  
Optical Scattering ◽  
Scattering Measurements ◽  
Gravitational Wave Detectors

scholarly journals Antioxidant Silver-based Biogenic Systems Generated from Arctium lappa Leaves

2020 ◽  
Vol 71 (4) ◽  
pp. 111-118
Author(s):  
Marcela Elisabeta Barbinta-Patrascu ◽  
Daniela Besliu ◽  
Aurelia Meghea
Keyword(s):  
Vitamin C ◽  
Metallic Nanoparticles ◽  
Biomedical Applications ◽  
Antioxidant Activities ◽  
Low Cost ◽  
Physical Stability ◽  
Arctium Lappa ◽  
Artificial Cell ◽  
Antioxidant Agents ◽  
Scattering Measurements

This work aims at designing through a �green� bottom-up strategy, four types of bio-based systems containing artificial cell membranes (with or without vitamin C) and silver nanoparticles (AgNPs) phyto-generated from aqueous extract of Arctium lappa leaves. The �green� approaches for AgNP synthesis, by using the vast bioreducing potential of plants are low-cost and eco-friendly procedures.Exploiting vegetal wastes as precursors for phyto-metallic nanoparticles has received attention from scientific community in the last years due to its significant economic and environmental impacts. UV-Vis absorption spectra demonstrated the biosynthesis of metallic nanoparticles which exhibited a strong SPR peak located at 437 nm wavelengths. The formation of the biocomposites containing the �green� synthesized AgNPs has been demonstrated by UV-Vis absorption spectroscopy and Dynamic Light Scattering measurements. DLS results highlighted the nanoscale size of the prepared �green� AgNPs. The physical stability of the obtained silver-based systems was evaluated through zeta potential values, based on electrophoretic mobility. The systems loaded with vitamin C proved to be more stable and showed enhanced antioxidant activities (between 72.3% to 88% evaluated by chemiluminescence technique). Our results demonstrated that these developed silver-based biogenic systems generated from Arctium lappa leaves could be used as antioxidant agents in various biomedical applications.

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