Broadband self-collimation effect in one-dimensional metal-dielectric structure

The projected band diagram of one-dimensional metal-dielectric structure was calculated. It shows that, a dispersionless band occurs in such a structure with proper parameters; and dispersion curves for the different wavelength were also shown considering realistic optical constants. A Gaussian beam incident in the one-dimensional metal-dielectric structure at different angles was simulated by verifying the self-collimation effect in the wavelength region of 440~600nm. Such a broadband self-collimation can be realized in different wavelength region with different material. Subwavelength imaging with the one-dimensional metal-dielectric structure was also analyzed. The resolution of λ/3 is achieved for the imaging with double slits source around a special wavelength.