Patterned Vertical Silicon Nanowire Arrays (IMAGE)
Caption
(a) 30º tilted SEM image of vertical silicon nanowire array pattern. Radii of the nanowires vary from 35 nm to 75 nm and the length of the nanowire is ~1 µm. Letters S (left), E, A, and S (right) each comprise nanowires with radii of 70 nm, 60 nm, 50 nm and 40 nm, respectively. (b) Bright-field optical microscope image of pattern. Gradual color change is achieved by gradual change of nanowire radii. (c) Magnified image of the selected area indicated by the white square of panel b. Each blue spot is a single nanowire. (d) 30º tilted SEM image of Bayer filter pattern. Pattern consists of vertical silicon nanowires with radii of 45 nm, 50 nm, and 65 nm representing red, blue, and green colors, respectively. Inset: magnified SEM image. Scale bar is 1 µm. (e) Bright-field optical microscope image of pattern. Each nanowire shows a color that can be controlled by appropriate choice of its radius.
Credit
Courtesy of Ken Crozier and Kwanyong Seo, Harvard School of Engineering and Applied Sciences
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