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Bidirectional coloration in reflection. a) Schematic of the eNPoM metafilms with thick (15 nm, top panel) and thin Au layers (5 nm, bottom panel) and their corresponding BF optical images in up‐ and downward reflection. b) Normalized reflection spectra versus voltage change. c) Time scans of normalized reflection spectra for 3 cycles of voltage −0.2 ↔ 0.6 V at scan rate 50 mV s−1, and d) corresponding color gamut dynamics (CIE 1964).
