Refractive-Index Determination of Solids from First- and Second-Order Critical Diffraction Angles of Periodic Surface Patterns

Title data

Meichner, Christoph ; Schedl, Andreas ; Neuber, Christian ; Kreger, Klaus ; Schmidt, Hans-Werner ; Kador, Lothar:
Refractive-Index Determination of Solids from First- and Second-Order Critical Diffraction Angles of Periodic Surface Patterns.
In: AIP Advances. Vol. 5 (2015) Issue 8 . - 087135.
ISSN 2158-3226
DOI der Verlagsversion: https://doi.org/10.1063/1.4928654

	Format: PDF Name: 1.4928654.pdf Version: Published Version Available under License Creative Commons BY 3.0: Attribution
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Project title:	Project's official title Project's id Open Access Publizieren No information

Abstract

We present two approaches for measuring the refractive index of transparent solids in the visible spectral range based on diffraction gratings. Both require a small spot with a periodic pattern on the surface of the solid, collimated monochromatic light, and a rotation stage. We demonstrate the methods on a polydimethylsiloxane film (Sylgard ® 184) and compare our data to those obtained with a standard Abbe refractometer at several wavelengths between 489 and 688 nm. The results of our approaches show good agreement with the refractometer data. Possible error sources are analyzed and discussed in detail; they include mainly the linewidth of the laser and/or the angular resolution of the rotation stage. With narrow-band light sources, an angular accuracy of ±0.025∘ results in an error of the refractive index of typically ±5 ⋅ 10−4. Information on the sample thickness is not required.

Further data

Item Type:	Article in a journal
Keywords:	Refractive index; diffraction gratings; refractometers; surface patterning; holography
DDC Subjects:	500 Science 500 Science > 500 Natural sciences 500 Science > 530 Physics
Institutions of the University:	Faculties Faculties > Faculty of Mathematics, Physics und Computer Science Faculties > Faculty of Mathematics, Physics und Computer Science > Department of Physics Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors > Chair Macromolecular Chemistry I - Univ.-Prof. Dr. Hans-Werner Schmidt Research Institutions Research Institutions > Central research institutes Research Institutions > Central research institutes > Bayreuth Institute of Macromolecular Research - BIMF Research Institutions > Central research institutes > Bayreuth Center for Colloids and Interfaces - BZKG Faculties > Faculty of Biology, Chemistry and Earth Sciences Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Chair Macromolecular Chemistry I Faculties > Faculty of Biology, Chemistry and Earth Sciences > Department of Chemistry > Former Professors
Language:	English
Originates at UBT:	Yes
Date Deposited:	13 Aug 2015 08:29
Last Modified:	22 Sep 2023 10:40
URI:	https://epub.uni-bayreuth.de/id/eprint/3153

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