title: Using phonon resonances as a route to all-angle negative refraction in the far-infrared region: the case of crystal quartz.
abstract: We consider how all-angle negative refraction may be induced in anisotropic crystals by making use of the phonon response. We investigate the example of crystal quartz at far-infrared wavelengths. Reflection and transmission measurements confirm the expected behavior, and show relatively high transmission efficiency at frequencies at which negative refraction occurs.
authors.affiliation: Departamento de Física, Universidade do Estado do Rio Grande do Norte, Costa e Silva, 59610-090 Mossoró RN, Brazil.
authors.forename: R
authors.initials: R
authors.lastname: Rodrigues da Silva
authors.forename: R
authors.initials: R
authors.lastname: Macêdo da Silva
authors.forename: T
authors.initials: T
authors.lastname: Dumelow
authors.forename: J A P
authors.initials: JA
authors.lastname: da Costa
authors.forename: S B
authors.initials: SB
authors.lastname: Honorato
authors.forename: A P
authors.initials: AP
authors.lastname: Ayala