Model for Alumina Nanopore-Based Optical Filter

Abstract

Alumina nanopore structures find applications in magnetic sensors, optical filters, and various biological devices. In this work, we 1 present a ray-optics model for the optical filter. We present a detailed simulation and a simplified analytical expression for the; reflectance as a function of the alumina parameters such as pore diameter, pore density, alumina thickness, and a function of the ' wavelength and angle of incidence of the illuminating plane electromagnetic wave. The reflectance vs wavelength in the range of.: 400-800 nm obtained from the simulation and the analytical expression are compared with that of the experiments for thin and thick alumina. All results agree well for a thin layer of alumina pores (90 nm). When comparing experimental and theoretical results for a thick layer of alumina ( 1300 nm), the results disagree. One possible explanation for the discrepancy is that the dielectric constant may vary with the thickness of the anodized alumina. Based on this work, a ray optic mixing theory is presented for waves propagating obliquely to parallel slabs of dielectric mediums with a degree of spatial periodicity.Physical and chemical properties of nanoscale materials depend on the geometrical shape and size.

Optical properties of thin metal films with nanohole arrays on porous alumina–aluminum structures

“…For angle dependent reections, one would need to take into account individual polarization components 39 and the anisotropy of the AAO layer. 36,40,41 The reection attenuation from the entire system can be found by calculating the ratio of the electric elds E 0À /E 0+ at the rst surface z 0 ¼ 0, using matching and propagation matrices. 42 Each spectrum contains multiple attenuation maxima (Fig.…”