title: Holographic grating based high sensitivity device for refractive index measurements.
abstract: In this communication, we show how a short-pitch diffractive structure can be used as a low-cost high sensitivity device for refractive index measurements with sensitivity of 10(-2). The device consists of a photo-resist diffraction grating put in optical contact with a hollow prism used as a container for a test material. Its main advantage is the possibility to monitor the composition of solids, fluids and gases in real time. Knowledge of optical parameters of a system with high accuracy can be vital when working in the biological/medical field.
authors.affiliation: D'Appolonia S.p.A. Largo Carlo Salinari, 18/19 - 00142 Rome, Italy.
authors.forename: Domenico
authors.initials: D
authors.lastname: Donisi
authors.forename: Roberto
authors.initials: R
authors.lastname: Caputo
authors.forename: Giovanni
authors.initials: G
authors.lastname: Cennini
mesh_terms: D006696:Holography / Q000295:instrumentation*; D055620:Optical Phenomena; D012031:Refractometry / Q000295:instrumentation*