Optical micrograph of a nematic liquid crystal drop in a polymer matrix, obtained with crossed polarizers and an additional phase retardation plate.

From the article:

Topological Polymer Dispersed Liquid Crystals with Bulk Nematic Defect Lines Pinned to Handlebody Surfaces
Michael G. Campbell, Mykola Tasinkevych, and Ivan I. Smalyukh
Phys. Rev. Lett. 112, 197801 (2014)

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