title: Mid-infrared second-order susceptibility of alpha-quartz and its application to visible-infrared surface sum-frequency spectroscopy.
abstract: We provide the first account of the second-order susceptibility of quartz down to 10 mum (1000 cm(-1)) and show how this data may be used along with the sum-frequency response of an amorphous gold surface to elucidate the nonlinear susceptibility of any material in the mid-infrared region. Crystalline quartz is an established material for use in second-harmonic and sum-frequency generation studies of new systems, on account of its well-characterized linear and nonlinear optical properties. Previous knowledge of its nonlinear susceptibility has been limited to its transparent region, wavelengths shorter than about 3 mum. Longer wavelength chi((2)) values for quartz are particularly important for techniques such as vibrational sum-frequency spectroscopy which are expanding into the mid-IR with the increasing availability of widely tunable infrared laser sources.
authors.affiliation: Department of Chemistry, University of Oregon, Eugene, Oregon 97403, USA.
authors.forename: Dennis K
authors.initials: DK
authors.lastname: Hore
authors.forename: Mathew Y
authors.initials: MY
authors.lastname: Hamamoto
authors.forename: Geraldine L
authors.initials: GL
authors.lastname: Richmond