Negative refraction and plano-concave lens focusing in one-dimensional photonic crystals

TL;DR

This paper demonstrates negative refraction and focusing using one-dimensional dielectric photonic crystals at microwave frequencies, with experimental results aligning well with theoretical calculations, highlighting potential for new applications.

Contribution

It provides experimental evidence of negative refraction and focusing in 1D photonic crystals, and shows their easy fabrication could enable new microwave device applications.

Findings

Negative refraction observed at microwave frequencies

Focusing achieved with plano-concave lens made of 1D PC

Experimental negative refractive indices match band structure calculations

Abstract

Negative refraction is demonstrated in one-dimensional (1D) dielectric photonic crystals (PCs) at microwave frequencies. Focusing by plano-concave lens made of 1D PC due to negative refraction is also demonstrated. The frequency-dependent negative refractive indices, calculated from the experimental data matches very well with those determined from band structure calculations. The easy fabrication of one-dimensional photonic crystals may open the door for new applications.