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

DOI zum Zitieren dieses Dokuments: https://doi.org/10.1063/1.4928654

Title data

Meichner, Christoph ; Schedl, Andreas Erich ; 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: https://doi.org/10.1063/1.4928654

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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 > Chair Macromolecular Chemistry I > Chair Macromolecular Chemistry I - Univ.-Prof. Dr. Hans-Werner Schmidt
Research Institutions
Research Institutions > Research Centres
Research Institutions > Research Centres > Bayreuth Institute of Macromolecular Research - BIMF
Research Institutions > Research Centres > 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
Language: English
Originates at UBT: Yes
Date Deposited: 13 Aug 2015 08:29
Last Modified: 13 Feb 2017 12:06
URI: https://epub.uni-bayreuth.de/id/eprint/3153

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