[7a-PA2-1~11] 3.1 Basic optics and frontier of optics

[7a-PA2-1] Complex refractive index of a silver pipe of 580 nm in diameter at λ= 660 nm

〇Fumiaki Tajima¹, Yoshio Nishiyama¹ (1.Yokohama Natl. Univ.)

Keywords:complex refractive index, fine silver-pipe, light scattering

The complex refractive index of a silver pipe of around 580 nm in diameter has been found to approach that of a silver thin film compared to the silver pipe of around 400 nm in diameter in the former report. The silver pipe is made from a spider silk of around 480 nm in diameter clad with silver and illuminated by a plane-polarized laser of wavelength 660 nm at normal incidence. The angular distribution of the light intensity scattered by the pipe is measured and fitted using theoretical calculations based on the corresponding model. The fitting results have led to the optimum values and uncertainty ranges of the index and the diameter of the pipe. A field emission scanning electron microscope confirms the diameter from the optical estimation.