Publica
Hier finden Sie wissenschaftliche Publikationen aus den FraunhoferInstituten. Zero and piStates in a Periodic Array of Deep Photonic Wires
 Advanced optical materials 2 (2014), Nr.8, S.746750 ISSN: 21951071 

 Englisch 
 Zeitschriftenaufsatz 
 Fraunhofer FEP () 
Abstract
A onedimensional periodic rectangular potential, also known as the KronigPenney (KP) potential, transforms the parabolic dispersion of a free particle into a set of bands separated by bandgaps. However, if the potential wells are deep enough, the lowest bands converge into a set of single discrete states, numbered from j = 1 to j = jmax, which can be even or odd, describing the number of extrema. Here, discrete and continuous KP states are experimentally observed within a periodically modulated metalorganic microcavity. Depending on the width of the photonic wires, the thickness of the cavity, and the added metal grating, the parity of the highest localized state jmax can be either even or odd, leading to a complementary parity of the first continuous mode. The apex of this Blochlike state in turn either starts at k = 0, or a state at the edges of the Brillouin zone, formed by the periodic metallic wires. An easy analytical explanation and numerical confirmation of zero or phase locking for laser modes in spatially modulated microcavities are provided.