J. Phys.: Condens. Matter |
Volume 14, Page 6383 - 6394 |
2002 |
Magnetic
Activity at Infrared Frequencies in Structured Metallic Photonic Crystals
Stephen O’Brien and JB Pendry
We derive the effective permeability and permittivity of a
nano-structured metallic photonic crystal by analyzing the complex reflection
and transmission coefficients for slabs of various thicknesses. These
quantities were calculated using the transfer matrix method. Our results
indicate that these structures could be used to realize a negative effective
permeability, at least up to infrared frequencies. The origin of the negative
permeability is a resonance due to the inductance and capacitance of the structure.
We also present an analytic model for the effective permeability of the
crystal. The model reveals the importance of the inertial inductance of the
electrons in the metal in calculating the resonance frequency. We find that
this additional contribution to the inductance has implications for the design
of metallic magnetic structures in the optical region of the spectrum. We show
that the magnetic activity in the structure is accompanied by the concentration
of the incident field energy into very small volumes within the structure. This
property will allow us to
considerably enhance non-linear effects with minute quantities of material.
This paper is available as
a PDF
file.