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HL: Fachverband Halbleiterphysik

HL 22: Photonic crystals II

HL 22.3: Vortrag

Dienstag, 27. März 2007, 14:30–14:45, H13

Corrugated metallic surfaces for negative permeability in the visible spectral range — •Heinz Schweizer¹, Liwei Fu¹, Hedwig Gräbeldinger¹, Hongcang Guo¹, Na Liu¹, Stefan Kaiser², and Harald Giessen¹ — ¹4. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart — ²1. Physikalisches Institut, Universität Stuttgart, 70550 Stuttgart

In order to achieve left-handed metamaterials, simultaneous negative permittivity and permeability are sufficient. Negative permittivity is normally realized through plasmonic oscillation of electrons in metals. However, a naturally occurring negative permeability does not exist at optical frequencies. At GHz frequencies, negative permeability can be realized by split ring resonators (SRR) with the magnetic field component penetrating the ring and the electric field component along the SRR-arms. At optical frequencies SRRs can be fabricated, but the plane matrix configuration of SRRs is usually unfavorable to achieve a negative n. We design a novel metallic meander structure which acts as an SRR, to fully couple the magnetic field into U-shaped metallic structures for obtaining negative permeability at optical frequencies. The structure is realized on ridge-patterned dielectric substrates with deposition of 20 nm Au. Samples with a period of 200-350 nm in steps of 50 nm were fabricated using E-beam lithography. With the H-field along the ridge and the k-direction normal to the substrate, the S-parameters were simulated and the effective parameters were retrieved. Simulations show that large values of permeability down to -7 between 600 nm and 900 nm can be obtained.