Porous silicon diffraction gratings

Abstract

This work reviews progress in the fabrication of high-resolution porous silicon gratings. A comparison of the various fabrication methods is presented, including prepatterning of silicon, stamping, laser writing, and photolithographic and photo-assisted dissolution. Various types of sensors incorporating gratings are discussed which use either intensity and/or spatial (angular) measurement. The sensing capabilities, features, and limitations of these types of gratings are presented.