All-fiber ellipsometer for nanoscale dielectric coatings

https://phys.org/news/2023-09-all-fiber-ellipsometer-nanoscale-dielectric-coatings.html

"measuring thickness and refractive index of thin films deposited on optical fibers, based on wavelength shifts of multiple cladding mode resonances in tilted fiber Bragg gratings... simultaneous wavelength tracking large set of resonances enables multiple parameter determinations... TFBG values (n = 2.25, 185 nm thick) within 4% of validation measurements... optical fiber sensors, process monitor for deposition on substrates with deposition methods that produce uniform coatings on dissimilar shaped substrates"

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