Optical properties of Cu/Au surfaces structures induced by fs laser exposure with circular polarization

2021 ◽  
Author(s):  
Artemiy A. Khankaev ◽  
Anna V. Tcibulnikova ◽  
Ilia G. Samusev ◽  
Ivan I. Lyatun ◽  
Vasiliy Slezhkin ◽  
...  
Keyword(s):  
Optical Properties ◽  
Circular Polarization ◽  
Laser Exposure ◽  
Fs Laser

Optical properties of water relaxing after intense laser exposure

2020 ◽  
Vol 37 (9) ◽  
pp. 2615
Author(s):  
Vitali V. Kononenko ◽  
Viktor M. Gololobov ◽  
Evgeny V. Zavedeev ◽  
Vitaly I. Konov
Keyword(s):  
Optical Properties ◽  
Intense Laser ◽  
Laser Exposure

scholarly journals Towards a comprehensive model of Earth's disk-integrated Stokes vector

2014 ◽  
Vol 14 (3) ◽  
pp. 379-390 ◽  
Author(s):  
A. García Muñoz
Keyword(s):  
Optical Properties ◽  
Circular Polarization ◽  
Near Infrared ◽  
Computational Cost ◽  
Three Dimensional ◽  
Polarization Vector ◽  
Monte Carlo Integration ◽  
Computational Time ◽  
Stokes Vector ◽  
Distinct Structure

AbstractA significant body of work on simulating the remote appearance of Earth-like exoplanets has been done over the last decade. The research is driven by the prospect of characterizing habitable planets beyond the Solar System in the near future. In this work, I present a method to produce the disk-integrated signature of planets that are described in their three-dimensional complexity, i.e. with both horizontal and vertical variations in the optical properties of their envelopes. The approach is based on Pre-conditioned Backward Monte Carlo integration of the vector Radiative Transport Equation and yields the full Stokes vector for outgoing reflected radiation. The method is demonstrated through selected examples inspired by published work at wavelengths from the visible to the near infrared and terrestrial prescriptions of both cloud and surface albedo maps. I explore the performance of the method in terms of computational time and accuracy. A clear strength of this approach is that its computational cost does not appear to be significantly affected by non-uniformities in the planet optical properties. Earth's simulated appearance is strongly dependent on wavelength; both brightness and polarization undergo diurnal variations arising from changes in the planet cover, but polarization yields a better insight into variations with phase angle. There is partial cancellation of the polarized signal from the northern and southern hemispheres so that the outgoing polarization vector lies preferentially either in the plane parallel or perpendicular to the planet scattering plane, also for non-uniform cloud and albedo properties and various levels of absorption within the atmosphere. The evaluation of circular polarization is challenging; a number of one-photon experiments of 109 or more is needed to resolve hemispherically integrated degrees of circular polarization of a few times 10−5. Last, I introduce brightness curves of Earth obtained with one of the Messenger cameras at three wavelengths (0.48, 0.56 and 0.63 μm) during a flyby in 2005. The light curves show distinct structure associated with the varying aspect of the Earth's visible disk (phases of 98–107°) as the planet undergoes a full 24 h rotation; the structure is reasonably well reproduced with model simulations.

scholarly journals Femtosecond-Laser Nanostructuring of Black Diamond Films under Different Gas Environments

Materials ◽  
2020 ◽  
Vol 13 (24) ◽  
pp. 5761
Author(s):  
Marco Girolami ◽  
Alessandro Bellucci ◽  
Matteo Mastellone ◽  
Stefano Orlando ◽  
Valerio Serpente ◽  
...  
Keyword(s):  
Optical Properties ◽  
High Vacuum ◽  
Diamond Films ◽  
Cost Effective ◽  
Laser Pulses ◽  
Ultra High Vacuum ◽  
Infrared Light ◽  
Ambient Conditions ◽  
Combined Use ◽  
Fs Laser

Irradiation of diamond with femtosecond (fs) laser pulses in ultra-high vacuum (UHV) conditions results in the formation of surface periodic nanostructures able to strongly interact with visible and infrared light. As a result, native transparent diamond turns into a completely different material, namely “black” diamond, with outstanding absorptance properties in the solar radiation wavelength range, which can be efficiently exploited in innovative solar energy converters. Of course, even if extremely effective, the use of UHV strongly complicates the fabrication process. In this work, in order to pave the way to an easier and more cost-effective manufacturing workflow of black diamond, we demonstrate that it is possible to ensure the same optical properties as those of UHV-fabricated films by performing an fs-laser nanostructuring at ambient conditions (i.e., room temperature and atmospheric pressure) under a constant He flow, as inferred from the combined use of scanning electron microscopy, Raman spectroscopy, and spectrophotometry analysis. Conversely, if the laser treatment is performed under a compressed air flow, or a N2 flow, the optical properties of black diamond films are not comparable to those of their UHV-fabricated counterparts.

scholarly journals Multichannel Polarization Lidar Measurements of Aerosols and Cirrus Clouds

2020 ◽  
Vol 237 ◽  
pp. 07020
Author(s):  
Jan Bai Nee
Keyword(s):  
Optical Properties ◽  
Circular Polarization ◽  
Mueller Matrix ◽  
Cirrus Cloud ◽  
Scattering Media ◽  
Lidar System ◽  
Mueller Matrices ◽  
Lidar Measurements ◽  
Stokes Vectors ◽  
Channel Polarization

In this paper we report using a 6-channel polarization detector to measure optical properties of aerosols and clouds. The polarization lidar system is designed to measure Stokes vectors and Mueller matrices from back-scatterings of air, aerosols and clouds by using several polarizers of setting at different angles, and a retarder to measure circular polarization. The 4 components Stokes vectors of the scattering media are constructed and a case of tropopause cirrus cloud and stratospheric aerosols are measured with the Mueller matrix derived.

scholarly journals Optical reconfiguration and polarization control in semi-continuous gold films close to the percolation threshold

Nanoscale ◽  
2017 ◽  
Vol 9 (33) ◽  
pp. 12014-12024 ◽  
Author(s):  
Christian Frydendahl ◽  
Taavi Repän ◽  
Mathias Geisler ◽  
Sergey M. Novikov ◽  
Jonas Beermann ◽  
...  
Keyword(s):  
Optical Properties ◽  
Percolation Threshold ◽  
Writing Process ◽  
Laser Pulses ◽  
Metal Films ◽  
Gold Films ◽  
Laser Writing ◽  
Polarization Control ◽  
Fs Laser ◽  
Continuous Metal

fs-Laser pulses can be used to locally alter the morphology and optical properties of semi-continuous metal films in a simple laser writing process.

Effect of fs laser exposure on the strength of toughened multimedia glass

2019 ◽  
Vol 521 ◽  
pp. 119467
Author(s):  
Jean-Sebastien Boisvert ◽  
Sebastien Loranger ◽  
Pierre Lorre ◽  
Victor Lambin Iezzi ◽  
Raman Kashyap
Keyword(s):  
Laser Exposure ◽  
Fs Laser
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