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Title: Refractive index dispersion functions of solid-phase polymers by multicolor optical diffraction

Abstract

We show that fourth-order dispersion functions of solid-phase polymers can be determined by multicolor optical diffraction. Electrodynamically trapped microparticles of polyethylene glycol with different molecular weights were probed by two-dimensional optical diffraction with four different laser wavelengths (632.8, 514.5, 488.0, and 457.9 nm); subsequent Mie analysis of one-dimensional scattering patterns yielded size and refractive index (both real and imaginary parts). Using a single wavelength as a size reference, the nonlinear dependence of the refractive index of solid (nonevaporating) polymer microparticles was determined by finding the refractive index for a given wavelength that best matched a Mie calculation subject to the reference size constraint. The experimentally determined refractive index values were fit to a standard fourth-order Cauchy function to obtain values for n{sub 0}, n{sub 1}, and n{sub 2}.

Authors:
; ; ; ;
Publication Date:
Sponsoring Org.:
(US)
OSTI Identifier:
40205298
Resource Type:
Journal Article
Journal Name:
Applied Physics Letters
Additional Journal Information:
Journal Volume: 77; Journal Issue: 16; Other Information: DOI: 10.1063/1.1318940; Othernumber: APPLAB000077000016002515000001; 041042APL; PBD: 16 Oct 2000; Journal ID: ISSN 0003-6951
Publisher:
The American Physical Society
Country of Publication:
United States
Language:
English
Subject:
71 CLASSICAL AND QUANTUM MECHANICS, GENERAL PHYSICS; DIFFRACTION; LASERS; MOLECULAR WEIGHT; PHYSICS; POLYETHYLENE GLYCOLS; POLYMERS; REFRACTIVE INDEX; SCATTERING; WAVELENGTHS

Citation Formats

Ford, J V, Sumpter, B G, Noid, D W, Barnes, M D, and Otaigbe, J U. Refractive index dispersion functions of solid-phase polymers by multicolor optical diffraction. United States: N. p., 2000. Web. doi:10.1063/1.1318940.
Ford, J V, Sumpter, B G, Noid, D W, Barnes, M D, & Otaigbe, J U. Refractive index dispersion functions of solid-phase polymers by multicolor optical diffraction. United States. https://doi.org/10.1063/1.1318940
Ford, J V, Sumpter, B G, Noid, D W, Barnes, M D, and Otaigbe, J U. Mon . "Refractive index dispersion functions of solid-phase polymers by multicolor optical diffraction". United States. https://doi.org/10.1063/1.1318940.
@article{osti_40205298,
title = {Refractive index dispersion functions of solid-phase polymers by multicolor optical diffraction},
author = {Ford, J V and Sumpter, B G and Noid, D W and Barnes, M D and Otaigbe, J U},
abstractNote = {We show that fourth-order dispersion functions of solid-phase polymers can be determined by multicolor optical diffraction. Electrodynamically trapped microparticles of polyethylene glycol with different molecular weights were probed by two-dimensional optical diffraction with four different laser wavelengths (632.8, 514.5, 488.0, and 457.9 nm); subsequent Mie analysis of one-dimensional scattering patterns yielded size and refractive index (both real and imaginary parts). Using a single wavelength as a size reference, the nonlinear dependence of the refractive index of solid (nonevaporating) polymer microparticles was determined by finding the refractive index for a given wavelength that best matched a Mie calculation subject to the reference size constraint. The experimentally determined refractive index values were fit to a standard fourth-order Cauchy function to obtain values for n{sub 0}, n{sub 1}, and n{sub 2}.},
doi = {10.1063/1.1318940},
url = {https://www.osti.gov/biblio/40205298}, journal = {Applied Physics Letters},
issn = {0003-6951},
number = 16,
volume = 77,
place = {United States},
year = {2000},
month = {10}
}