Fig. 4
From: Optical waveguides based on one-dimensional organic crystals
1D solid-state microstructures for optical waveguides. a Bright-field Transmission Electron Microscope (TEM) image of a PDI wire with a scale bar of 2 μm. b Dark field and PL images of a PDI wire with a scale bar of 2 μm. c Spatially resolved PL spectra from the tip of the microwire for different separation distances between the excitation spot and tip of the wire. Inset shows Iout/Iin versus propagation distance and exponential fit (red line). d Bright-field SEM image of a single FF-RhB microrod with a scale bar of 10 μm. e Bright-field and PL images of a single FF-RhB microrod with a scale bar of 10 μm. f The excitation distance-dependent PL intensity at each end point. The distance denotes the length between the right end point and the excitation spot. g FM image of the TPSDB organic micro-ribbons with a scale bar of 100 μm. h PL images by exciting the identical TPDSB micro-ribbon at different points with a 375 nm laser. The scale bar is 20 μm. i Spatially resolved PL spectra from the tip of the micro-ribbon for different separation distances between the exciting point and the right tip of the micro-ribbon shown in h. Inset shows Iout/Iin versus propagation distance and exponential fit. a, b, c Reprinted with permission from ref. [33] Copyright 2010, Wiley-VCH. d, e, f Reprinted with permission from ref. [34] Copyright 2015, American Chemical Society. g, h, i Reprinted with permission from ref. [36] Copyright 2019, American Chemical Society