We report a systematic study on the dependence of nanowire evanescent wave coupling efficiency on wavelength, cross angle, and core diameter. An diameter silica taper was used for light launching. Three poly(trimethylene terephthalate) nanowires with , , and diameters were used for light transmission. Five wavelengths (visible, 473, 532, ; near-IR, 1310 and ) were used as transmission signals. The dependence of coupling efficiency was investigated at cross angles from 90° to 0° with a 5° changing step. It is observed that the coupling efficiency is higher for longer wavelength of light, smaller cross angle, and smaller nanowire diameter.
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