title: Negative refraction and flat-lens focusing in a 2D square-lattice photonic crystal at microwave and millimeter wave frequencies.
abstract: We report on a study of the wave propagation and refraction in a 2D square-lattice photonic crystal for the first two photonic bands as well as the coupling of the external waves and criteria for flat-lens focusing. Microwave experiments and numerical simulations are performed. Main results concern the transition from positive to negative refraction below the first band gap, the flat-lens focusing using a novel criterion, viz. the constancy of the ratio of the tangents of the incident and refracted angle. Focusing results for medium ( approximately 10) and ultra-large dielectric contrast ( approximately 100) are presented. In the latter case focusing with a spot size below one wavelength at distances several wavelengths behind the photonic crystal is achieved.
authors.forename: R
authors.initials: R
authors.lastname: Meisels
authors.forename: R
authors.initials: R
authors.lastname: Gajic
authors.forename: F
authors.initials: F
authors.lastname: Kuchar
authors.forename: K
authors.initials: K
authors.lastname: Hingerl