Cube polarizers by the use of metal particles in anodic alumina films

Polarization dependent devices realized by using asymmetrical hole array on a metallic film

A method is brought forward for realizing polarization dependent devices by employing sub-wavelength asymmetrical hole array on a metallic film. Based on the fundamental mode approximation, the phase retardations of rectangular hole for two orthogonal polarization incident waves are analyzed and calculated. Using rectangular hole array, a bifocal-polarization lens for the infrared radiation with 10.6 microm wavelength is designed. Its focal lengths for x- and y- polarized incident wave are examined by the finite difference time domain (FDTD) method and the Rayleigh-Sommerfeld diffraction integrals and the obtained results agree well with the designed values.

Simple method to fabricate a polarizer with a large aperture by the use of anodic alumina films

A simple method is proposed for the fabrication of an optical polarizer with a large aperture by the use of anodic alumina films. The aperture size of the polarizer is 10 × 10 mm(2), the extinction ratio is shown to be larger than 35 dB, and the insertion loss is less than 1 dB at a wavelength of 1.55 µm.