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Wavelength, cross-angle, and core-diameter dependence of coupling efficiency in nanowire evanescent wave coupling

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Abstract

We report a systematic study on the dependence of nanowire evanescent wave coupling efficiency on wavelength, cross angle, and core diameter. An 800nm diameter silica taper was used for light launching. Three poly(trimethylene terephthalate) nanowires with 640nm, 790nm, and 950nm diameters were used for light transmission. Five wavelengths (visible, 473, 532, 650nm; near-IR, 1310 and 1550nm) 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.

© 2009 Optical Society of America

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