[16p-P10-1~9] 3.1 Basic optics and frontier of optics

[16p-P10-1] Shape dependent transition in complex refractive index of a silver fine pipe at λ= 660 nm

〇Fumiaki Tajima¹, Nishiyama Yoshio¹ (1.Yokohama Nat'l Univ.)

Keywords:fine silver pipe, complex refractive index, shape dependent transition

The complex refractive index of a silver pipe that is subwavelength in diameter have been found to be different from those of a silver thin film for the first time. The silver pipe is made from a spider silk of half-wavelength 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 lead 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.