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Design and Synthesis of Neutral Density Filter in Visible Range for Color Sorting Applications

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Title Design and Synthesis of Neutral Density Filter in Visible Range for Color Sorting Applications
 
Creator Yadav, Mini
Yadav, Sandeep
Shankar, Ajay
Bala, Renu
Rani, Mamta
 
Subject Attenuator
Optical coating
Absorption
Thin film
Transmission
 
Description 932-939
This paper provides the design, construction, and characterization of a neutral density filter (NDF) for the visible
spectrum and investigate the thickness effect on their various properties. In this work, Nichrome single layer was designed
by the Essential Macleod modelling software. The Co-evaporation ofss nickel and chromium was used to construct a filter
on a glass substrate by thermal vacuum coating unit under high vacuum. Low thickness supports amorphous nature
examined by XRD diffractogram. Energy-Dispersive X-ray Spectroscopy (EDAX) examinations of the thin films revealed
that high thickness has slight variation in constant stoichiometry for the chosen Nickel/Chromium ratio (80:20) during
co-evaporation and confirm the deposition is successfully done. Additionally, Atomic Force Microscopy (AFM) analysis
revealed that surface roughness decreased from 6.034 to 2.895 in correlation with increased layer thickness. These methods
made it possible to produce NDFs with optical densities ranging from 0.5 OD at 10 nm film thickness to 2.7 OD at 70 nm
thickness. As a result, for steady and long-lasting NDF, the spectral fluctuation of thin filters in our case is lowest at 10 nm
(ΔOD= 0.08). A good match data was found between optical transmission and absorption spectra of the designed and the
deposited films. The designed NDF's applicability and effectiveness for color sorting tasks were subsequently examined,
marking a promising step towards advancing optical engineering solutions in this specific application domain.
 
Date 2024-10-03T10:57:32Z
2024-10-03T10:57:32Z
2024-10
 
Type Article
 
Identifier 0975-0959 (Online); 0301-1208 (Print)
http://nopr.niscpr.res.in/handle/123456789/64673
https://doi.org/10.56042/ijpap.v62i10.8277
 
Language en
 
Publisher NIScPR-CSIR,India
 
Source IJPAP Vol.62(10) [October 2024]