A Broadband, Multiplexed‐Visible‐Light‐Transport in Composite Flexible‐Organic‐Crystal Waveguide

We report the construction of an organic crystal multiplexer using three chemically and optically different acicular, flexible organic crystals for a broadband, visible light signal transportation. The mechanical integration of a highly flexible crystal waveguide of (Z)‐2‐(3,5‐bis(trifluoromethyl)phenyl)‐3‐(7‐methoxybenzo[c][1,2,5]thiadiazol‐4‐yl)acrylonitrile (BTD2CF3) displaying bright yellow (λ1) fluorescence with blue‐emitting (λ2) BPP and cyan emitting (λ3) DBA crystals using AFM‐tip provides a composite organic crystal multiplexer. The constructed hybrid single crystal multiplexer effectively transduces three optical signals (λ1+λ2+λ3) covering the 420–750 nm region as a composite output signal. The presented proof‐of‐principle experiment demonstrates the real potential of organic flexible crystal waveguides for visible light communication technologies. Mechanical integration of three optically different flexible crystal waveguides produces a compact organic wavelength division multiplexer (WDM). This WDM merges three narrow‐band optical signals (blue, cyan, and yellow) to transmit a broadband visible light signal. Such wide bandwidth signal multiplexers open the doors to visible light communication (VLC) technologies.