Abstract
In this work, we demonstrate cross-polarization anomalous light refraction using V-shaped air slits array fabricated on a thin gold film. We use finite-difference time domain (FDTD) method to perform our simulation work. When the x-polarization light normally incident onto the slits array, there would be an x-polarized transmission light as well as an angle-bent y-polarized field. We can explain the bent light by the generalized Snell’s and find out the appropriate dimension. Thus the selected dimension could be used in further analysis and experiment measurement. Our experiment sample is fabricated by focus ion beam (FIB) on thermally evaporated gold film with glass substrate. We use a simple imaging system with a near infrared(NIR) camera as our experimental setup. We collect the images at different positions under the sample stage to get different separation between transmission light and refraction light and thus count out the refraction angle. Furthermore, we use different wavelengths as our light source and find that the result angles match well to theoretical values.