Published: July 12, 2023

Here, structural color generated by total internal reflection (TIR) interference at microscale concave interfaces is tuned via evanescent wave absorption dyes. Using quantitative angle-resolved spectral analysis combined with ray tracing simulation, it demonstrated that the multibounce TIR trajectories enhance efficiency of dye and usefulness in modulating reflected colors. Depending on absorbance spectrum used, amount coated interface, angle-dependent colors can be predictably altered. The use a near-infrared absorbing allows for combination overt color-shifting iridescent effects under illumination visible wavelengths covert optical-motion near-infrared. This work, which explores an innovative approach controlling reflective properties structurally colored materials, may interest both fundamental research applications such as sensors, coatings, security.

Language: Английский