Regensburg 2007 – wissenschaftliches Programm

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HL: Fachverband Halbleiterphysik

HL 22: Photonic crystals II

HL 22.5: Vortrag

Dienstag, 27. März 2007, 15:00–15:15, H13

Numerical study of optical negative index metamaterials based on embedded nano-meander structures — •Liwei Fu, Heinz Schweizer, Hongcang Guo, Na Liu, and Harald Giessen — 4. Physikalisches Institut, Pfaffenwaldring 57, 70550 Stuttgart

For the realization of a left-handed metamaterial or negative index metamaterial, a longitudinal capacitance and a shunt inductance in a transmission line model are required to achieve simultaneously negative permeability and permittivty. In our new approach to negative index materials at optical frequencies, a meander metallic structure on a ridge-patterned substrate is designed for obtaining the longitudinal capacitance. Thin metal films are added for shunt inductance. In this way, two degrees of freedom can be used to adjust the permeability and permittivity spectrum with respect to each other in frequency. The distance of the metal films to the meander can be used as a parameter to obtain an overlap of the real part of negative permittivity and permeability. With this composite nanostructure embedded in SiO2, a negative refractive index can be obtained between 800 nm to 1200 nm with a real part of -2 and a figure of merit of 1.5.