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In article number 1908592, Young Min Song and co‐workers develop a flexible, large‐area covert polarization display based on ultra‐thin lossy nanocolumns with a wide color selectivity. Multi‐functional covert polarization display labels are attached to daily objects with curved and wrinkled surfaces, and hidden quick response codes are revealed by polarization adjustment or water contact.
Covert polarization displays provide a barrier to the inadvertent viewing of stored optical information. For security and anti‐counterfeiting purposes, access to concealed information without compromising packaging aesthetics is required in certain situations. However, optical conversion with polarized light typically requires sophisticated nanostructures only possible with limited materials, which...
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