Fig. 3: Pattern resolution, depth control, and repeatability tests of the DITD process and plasmonic applications.
From: Designer patterned functional fibers via direct imprinting in thermal drawing
a Resolution test pattern including rectangular blocks with different sizes and orientations fabricated on fiber. b Enlarged image showing a feature size in tens of nanometer. c Cross-sectional images of the patterned fibers, demonstrating the pattern depths of 2 μm, 8 μm, and 20 μm. d Rectangular rod array fabricated on fiber surface. The width and length of the rectangular rods are 700 nm and 2.1 μm. e Cylinder array on fiber surface with radius and period of 150 nm and 400 nm. f Cylinder array on fiber surface with radius and period of 150 nm and 800 nm. g SEM image of the gold nanorods with an aspect ratio of 3 (left) and the corresponding local electric field spatial distributions with transverse (top right, scale bar, 1 μm) and longitudinal laser polarizations (bottom right, scale bar, 1 μm). j SEM image and the corresponding local electric field spatial distributions of the gold cylinders with an array period of pattern 1 ≈ 800 nm and pattern 2 ≈ 400 nm. Scale bars, 300 nm for pattern 1 and 150 nm for pattern 2. Dark-field scattering spectra of the gold nanorods (h) and gold cylinders (k). Simulated scattering cross-section of the gold nanorods (i) and gold cylinders (l).
