title: Spectroscopic measurement of the refractive index of ion-implanted diamond.
abstract: We present the results of variable-angle spectroscopic ellipsometry and transmittance measurements to determine the variation of the complex refractive index of ion-implanted single-crystal diamond. An increase is found in both real and imaginary parts at increasing damage densities. The index depth variation is determined in the whole wavelength range between 250 and 1690 nm. The dependence from the vacancy density is evaluated, highlighting a deviation from linearity in the high-damage-density regime. A considerable increase (up to 5%) in the real part of the index is observed, attributed to an increase in polarizability, thus offering new microfabrication possibilities for waveguides and other photonic structures in diamond.
authors.affiliation: Department of Experimental Physics-NIS Centre of Excellence, University of Torino, Torino, Italy.
authors.forename: Alfio
authors.initials: A
authors.lastname: Battiato
authors.forename: Federico
authors.initials: F
authors.lastname: Bosia
authors.forename: Simone
authors.initials: S
authors.lastname: Ferrari
authors.forename: Paolo
authors.initials: P
authors.lastname: Olivero
authors.forename: Anna
authors.initials: A
authors.lastname: Sytchkova
authors.forename: Ettore
authors.initials: E
authors.lastname: Vittone