Mirror or Glass: a crystal with two optical faces shows one of the strongest light-bending effects seen in a natural material
Peer-Reviewed Publication
Updates every hour. Last Updated: 19-Jun-2026 21:15 ET (20-Jun-2026 01:15 GMT/UTC)
To realize the vision of "invisible" wearable optoelectronics such as smart contact lenses and ultrathin AR glasses, traditional, bulky optical components must be reinvented at the atomic level. XPANCEO researchers, alongside collaborators from NUS and UCT Prague, have taken a major step toward this goal by uncovering the extraordinary properties of the layered crystal molybdenum oxychloride MoOCl2. Published in Nano Letters, the study provides the first experimental map of the material that possesses the strongest light-bending effect ever recorded in a natural substance, offering a direct path to miniaturizing high-performance optical hardware. The research reveals that MoOCl2 is a sort of "chameleon" in the world of physics. Due to its extreme optical anisotropy, this crystal’s function depends entirely on its orientation. Oriented one way, the crystal reflects light like a metal; turned by 90 degrees, it becomes transparent like glass. With an in-plane birefringence value of about 2.2, the crystal can split and bend light with unprecedented efficiency. For XPANCEO’s development, this means the complex light manipulation required for AR displays can now be achieved using materials thousands of times thinner than the diameter of a human hair.
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