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(Color online) (a) SEM image of AAO membranes showing porous architecture over a large area before used in NIL (inset is high magnification image of same membrane showing hexagonal ordering and pore size). (b) Schematic illustrations describing fabrication steps of HSQ ordered nanorod arrays. (c) SEM micrograph of HSQ nanorod arrays (inset shows high magnification image of same ordered arrays).
(Color online) (a) Ellipsometric reflectance measurements acquired at oblique incidences (15°-65°) from HSQ thin film and (b) reflectance curves obtained from ordered HSQ nanorod arrays on the same glass sample at the same incidence angles. Specular reflection from HSQ nanorod surface is below 1% for all visible region up to 55° incidence angles.
(Color online) (a) Experimental transmission curves at normal incidence obtained from HSQ nanorod arrays, HSQ thin film, and bare glass substrate. (b) Simulated transmission obtained using approximately the same nanorod height and film thickness as in experimental case. We used n = 1.52 and n = 1.41 for the refractive indices of glass and HSQ, respectively, in simulations.
(Color online) (a) Two-dimensional plot for transmission through HSQ tapered nanorod array on both sides of a glass substrate as a function of nanorod height and wavelength of the light. The vertical dashed line corresponds to the optimum height of nanorods (175 nm). (b) Calculated average transmission as a function of nanorod height for array structures on both sides of glass substrate. (c) Polarization dependent transmission as a function of incidence angle for tapered nanorod array/thin film system at the wavelength of 550 nm.
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