Figure 1 Working principle and experimental characterization of time-programmable coloration. (IMAGE)

Light Publishing Center, Changchun Institute of Optics, Fine Mechanics And Physics, CAS

Figure 1 Working principle and experimental characterization of time-programmable coloration.

Caption

Figure 1 Working principle and experimental characterization of time-programmable coloration. Under broadband white light illumination, the designed 3D metastructures precisely modulate the optical field to generate predefined colors and patterns in the far field. The enlarged inset illustrates the modulation mechanism of the structural colors produced by the 3D metastructures, where nenv1, nenv2 and nenv3 denote the environmental refractive indices corresponding to different device working environments. Morphological characterization of the chameleon-inspired patterned 3D metastructures is shown with scanning electron microscopy (SEM) images of the complete pattern and a magnified local region (bottom left). Time-programmable continuous color tuning achieved under varying environmental refractive indices is illustrated on the right, where T1–T7 represent the corresponding programmable time points. The bottom insets depict representative R/G/B output states under three distinct refractive index conditions.

Credit

Zhi-Yong Hu et al.

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