Directed diffraction without negative refraction

Abstract

Using the FDTD method, we investigate the electromagnetic propagation in two-dimensional photonic crystals, formed by parallel air cylinders in a dielectric medium. The corresponding frequency band structure is computed using the standard plane-wave expansion method. It is shown that within partial bandgaps, waves tend to bend away from the forbidden directions. This phenomenon perhaps need not be explained in terms of negative refraction or `superlensing' behavior, contrast to what has been conjectured.

3 pages, 4 figures

References in corpus (1)

• Guiding optical flows by photonic crystal slabs made of dielectric cylinders

Cited by in corpus (6)

• Sub-wavelength imaging at optical frequencies using canalization regime
• Sub-wavelength imaging by wire media
• On homogenization of electromagnetic crystals formed by uniaxial resonant scatterers
• Sub-wavelength imaging at infrared frequencies using an array of metallic nanorods
• Experimental demonstration of sub-wavelength image channeling using capacitively loaded wire medium
• Experimental demonstration of self-collimation beaming and splitting in photonic crystals