Preprint Article Version 1 This version is not peer-reviewed

Ultra-low Anti-reflection Coating on a Plastic Cover Slip in Liquid for He-Ne Laser Light

Version 1 : Received: 31 May 2017 / Approved: 31 May 2017 / Online: 31 May 2017 (11:50:18 CEST)

A peer-reviewed article of this Preprint also exists.

Hsu, J.-C.; Cho, H.-Y.; Hsieh, T.-Y.; Wang, J.-L. Ultra-Low Reflectivity Anti-Reflection Coating on a Plastic Cover Slip in Liquid for He-Ne Laser Light. Coatings 2017, 7, 89. Hsu, J.-C.; Cho, H.-Y.; Hsieh, T.-Y.; Wang, J.-L. Ultra-Low Reflectivity Anti-Reflection Coating on a Plastic Cover Slip in Liquid for He-Ne Laser Light. Coatings 2017, 7, 89.

Journal reference: Coatings 2017, 7, 89
DOI: 10.3390/coatings7070089

Abstract

An ultra-low anti-reflection optical coating on both surfaces of a plastic cover slip was studied for use in confocal image measurement. The optical reflectance at a wavelength of 632.8 nm was less than 0.1% when the coated sample was placed in a liquid having a refractive index of 1.34 close to the aqueous solution of the biomaterial. The high- and low-index coating films, Substance-2 (PrTiO3) and silicon dioxide (SiO2), were measured by an ellipsometer to determine their optical refraction indices and extinction coefficients. Theoretically, when the two layer thicknesses are designed using the optical admittance diagram of the cover slip to approach the equivalent index of 1.34, a reflectance of 1.6×10-5% in the liquid could be obtained. Experimentally, the reflectance of the sample deposited on the two faces of the cover slip was 4.223±0.145% as measured in the air; and 0.050±0.002% as measured by a He-Ne laser in the liquid.

Subject Areas

ultra-low anti-reflection coating; ellipsometer; optical admittance method

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