Information on the polarization properties of scattered light from plasmonic systems
are of paramount importance due to fundamental interest and potential applications.
However, such studies are severely compromised due to the experimental difficulties
in recording full polarization response of plasmonic nanostructures. Here, we report
on a novel Mueller matrix spectroscopic system capable of acquiring complete
polarization information from single isolated plasmonic nanoparticle/nanostructure.
The outstanding issues pertaining to reliable measurements of full
4 × 4 spectroscopic scattering Mueller matrices
from single nanoparticle/nanostructures are overcome by integrating an efficient
Mueller matrix measurement scheme and a robust eigenvalue calibration method with a
dark-field microscopic spectroscopy arrangement. Feasibility of quantitative
Mueller matrix polarimetry and its potential utility is illustrated on a
simple plasmonic system, that of gold nanorods. The demonstrated ability to record
full polarization information over a broad wavelength range and to quantify the
intrinsic plasmon polarimetry characteristics via Mueller matrix
inverse analysis should lead to a novel route towards quantitative
understanding, analysis/interpretation of a number of intricate plasmonic effects
and may also prove useful towards development of polarization-controlled novel
sensing schemes.
Highlights of the article are:<div>• Presented a systematic study of Deep Learning (DL), Deep Transfer Learning (DTL) and Edge Computing(EC) to mitigate COVID-19.</div><div>• Surveyed on existing DL, DTL, EC, and Dataset to mitigate pandemics with potentialities and challenges. </div><div>• Drawn a precedent pipeline model of DTL over EC for a future scope to mitigate any outbreaks.</div><div>• Given brief analyses and challenges wherever relevant in perspective of COVID-19.</div>
The evolution of ferromagnetism has been investigated in thiol (2-mercaptoethanol) capped Mn doped CdS nanoparticles synthesized at various temperatures by sol-gel reverse micelle mechanism. X-ray diffraction measurements reveal a structural phase transformation from wurtzite to zinc blende structure with the increase in synthesis temperature of Mn doped nanocryatals. Magnetic measurements suggest that the antiferromagnetic interactions of Mn2+ ions within Mn—cluster in Mn doped CdS nanocrystals synthesized at lower temperature (∼17 °C) reduce the total magnetic moment at ambient temperature. Whereas the isolated Mn2+ ions in nanocrystals synthesized above 70 °C enhance the magnetic moment due to the sp-d exchange interaction at ambient temperature. It has been observed that the magnetic moments in all samples synthesized at various temperatures do not saturate even at lowest temperature, 5 K. The core diamagnetism in doped nanocrystals synthesized at low temperature (∼17 °C) is mostly due to the presence of magnetic ions around the surface, whereas these ions exist randomly throughout the crystal for samples synthesized at high temperature (∼70 °C), as a result core diamagnetism vanishes.
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