Light polarization creates art, explains mathematical concepts

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Light polarization creates art, explains mathematical concepts
The stochastic stress-induced birefringence within plastic spoons left in the hot sun is visualized through polarization-filtered coloration. The spoons are placed between a pair of co-aligned polarizer sheets in an open-gate arrangement, with a backing of parchment paper to act as a diffuser for sunlight illumination. Credit: Aaron Slepkov, Trent University

The polarization of light underpins a variety of recent technological innovations, including 3D cinema and LCDs. In LCDs, tiny electronically controllable liquid crystal elements are sandwiched between polarizers. If, instead, other transparent polarization-altering films—like cellophane gift wrap and packaging tape—are placed between a set of polarizers, an array of polarization-filtered colors can be observed.

In the American Journal of Physics, Aaron Slepkov, from Trent University in Canada, explores the physics of how such colors emerge, how they can be controlled, and why subtle changes in viewing angle, sample orientation, and the order of layers of films between polarizers can have dramatic effects on the observed colors.

The research emphasizes visual examples of concepts related to birefringence, such as addition, subtraction, and order-of-operations. For example, the noncommutative nature of birefringent addition is typically illustrated using formal matrix mathematics. However, in this case, the researchers use color visualization.

“I use a visual language of coloration to illustrate subtle physics that is often only demonstrated mathematically,” said Slepkov.

He was inspired, in part, by the work of artist Austine Wood Comarow, who made a career in applying polarization-filtered coloring techniques in fine art. Austine coined the term “polage,” or polarization of collage, to refer to her art.

Austine created a wide array of works using sophisticated layering of cut cellophane and other birefringent polymer films, interspersed with layers of film polarizers. Her pieces range from small stand-alone pieces that fit on a shelf to massive career-spanning installations in institutions, such as the Disney Epcot Center in 1981 and the Gyeongsangnam-do Institute of Science Education, in Jinju, South Korea, in 2017.

“In this work, I clarify the link between polarization filtering and the observed colors. I demonstrate how various aspects of birefringence in common household films provide opportunities and challenges for their use in art,” said Slepkov.

To create polarization-filtered color, all that is needed is a birefringent sample sandwiched between polarizers that form a polarization gate. Many household items can provide a kaleidoscopic array of colors and patterns.

Transparent plastic cutlery, for instance, provide a classic demonstration, where localized strain in the polymer structure results in differential birefringence, observable through a polarization gate. Likewise, somewhat randomly folded kitchen cling wrap, gift basket film, and layered adhesive tape can form intricate images reminiscent of stained-glass windows.

“The manipulation of birefringent films for the purpose of creating color images is fun and intellectually stimulating. Much of the nuanced physics of polarization, birefringence, retardance, and color theory can be observed in this accessible yet expansive endeavor,” said Slepkov.


Highest degree of purity achieved for polarized X-rays


More information:
Aaron D. Slepkov, Painting in polarization, American Journal of Physics (2022). DOI: 10.1119/5.0087800

Citation:
Light polarization creates art, explains mathematical concepts (2022, July 22)
retrieved 22 July 2022
from https://phys.org/news/2022-07-polarization-art-mathematical-concepts.html

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