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Negative Refractive Index of Meta-materials at Optical Frequencies

Published online by Cambridge University Press:  26 February 2011

S. Anantha Ramakrishna  and
Sangeeta Chakrabarti
S. Anantha Ramakrishna
Affiliation:
sar@iitk.ac.in, Indian Institute of Technology Kanpur, Department of Physics, Department of Physics,, Indian Institute of Technology Kanpur, Kanpur, 208016, India
Sangeeta Chakrabarti
Affiliation:
sangeet@iitk.ac.in, Indian Insitute of Tehcnology Kanpur, Department of Physics, Kanpur, 208016, India
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Abstract

Scaling the performance of metamaterials to obtain negative refractive index at optical frequencies has been of great interest. One of the great barriers to the scaling is that real currents cannot be driven at very high frequencies and one is more dependent on displacement currents to generate negative magnetic permeability. Moreover to keep the dimensions of the metamaterials physically accessible, the structural lengthscales of the metamaterials begin approach the wavelength of the radiation in free space and homogenisation is often questionable. Here we will show that metamaterials such as Split ring resonators in these high frequency limits exhibit complex behaviour. Magnetic activity and Negative refractive index behaviour can, indeed, be obtained at optical frequencies but will need to be interpreted very carefully. The plasmonic nature of the metallic system and excitation needs to be considered in detail.

Keywords

opticalnanostructureoptical properties
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 964: Symposium R – Meta-Materials at the Milli-, Micro-, and Nanoscale , 2006 , 0964-R01-02
Copyright
Copyright © Materials Research Society 2007

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References

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