Open AccessNegative refraction and flat-lens focusing in a 2D square-lattice photonic crystal at microwave and millimeter wave frequencies
Author(s) -
R. Meisels,
Radoš Gajić,
F. Kuchar,
Kurt Hingerl
Publication year - 2006
Publication title -
optics express
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.394
H-Index - 271
ISSN - 1094-4087
DOI - 10.1364/oe.14.006766
Subject(s) - optics , photonic crystal , negative refraction , wavelength , lens (geology) , microwave , millimeter , physics , square lattice , refraction , refractive index , condensed matter physics , quantum mechanics , ising model
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.