Negative Refraction and Plano-Concave Lens Focusing in One-Dimensional Photonic Crystals
P. Vodo, W. T. Lu, Y. Huang, and S. Sridhar
Applied Physics Letters, V.89, P.084104 (2006)
Negative refraction is demonstrated in one-dimensional _1D_ dielectric photonic crystals _PCs_ at microwave frequencies. Focusing by plano-concave lens made of 1D PCs due to negative refraction is also demonstrated. The frequency-dependent negative refractive indices, calculated from the experimental data, match very well with those determined from band structure calculations. The easy fabrication of one-dimensional photonic crystals may open the door for future applications.