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Proceedings Paper

Polarimetry of nacre in iridescent shells
Author(s): R. A. Metzler; C. Burgess; B. Regan; S. Spano; E. J. Galvez
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Paper Abstract

We investigate the light transmitted or reflected from nacre (mother of pearl) taken from the iridescent shell of the bivalve Pinctad a fucata. These nacre surfaces have a rich structure, composed of aragonite crystals arranged as tablets or bricks, 5 μm wide and 400-500 nm thick, surrounded by 30nm thick organic mortar. The light reflected from these shell surfaces, or transmitted through thin polished layers, is rich in its polarization content, exhibiting a space dependent variation in the state of polarization with a high density of polarization singularities. Our goal is to use the polarization information to infer the structure of the biominerals and the role of the organic layer in determining the orientation of the crystals. In the experiments we send the light from a laser with a uniform state of polarization onto the shell, and analyze the light that is either transmitted or reflected, depending on the type of experiment, imaging it after its passage through polarization filters. We use the images from distinct filters to obtain the Stokes parameters, and hence the state of polarization, of each image point. We also construct the Mueller matrix for each imaged point, via 36 measurements. We do this for distinct physical and chemical treatments of the shell sample. Preliminary data shows that the organic layer may be responsible for organizing a multi-crystalline arrangement of aragonite tablets.

Paper Details

Date Published: 5 September 2014
PDF: 11 pages
Proc. SPIE 9187, The Nature of Light: Light in Nature V, 918704 (5 September 2014); doi: 10.1117/12.2061196
Show Author Affiliations
R. A. Metzler, Colgate Univ. (United States)
C. Burgess, Colgate Univ. (United States)
B. Regan, Colgate Univ. (United States)
S. Spano, Colgate Univ. (United States)
E. J. Galvez, Colgate Univ. (United States)

Published in SPIE Proceedings Vol. 9187:
The Nature of Light: Light in Nature V
Rongguang Liang; Joseph A. Shaw, Editor(s)

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