Microwave components based on 2d photonic crystals with unusual index of refraction

Abstract

This work reports on measurements of microwave components based on Photonic Crystals (PC) with unusual index of refraction, i.e. neff < 1. Particularly lenses based on different PC structures are investigated. All measurements are done in the microwave regime, i.e. for frequencies ranging between 6 and 15 GHz. Intensity gains ranging from 15 to 40, depending on the lens shape and radiation polarization, could be found. Some lens structures focus only in a very narrow wavelength interval, where always a optimum can be find, thus they operate as filters as well. Different kinds of beam splitting could be measured as well. Depending on the lens shape maxima of the beam split occur at different positions and with different intensities. Most of the experimental results will be compared to the ones predicted by theory. A very good agreement between measurements and simulations is evienced.