Accession Number:

ADA413975

Title:

Tunable Photonic Nanostructures 2: Semi-Transparent Metallic Opal Replicas and Nanocomposites

Descriptive Note:

Conference paper

Corporate Author:

TEXAS UNIV AT DALLAS DEPT OF PHYSICS

Personal Author(s):

Report Date:

2001-07-01

Pagination or Media Count:

20.0

Abstract:

The same free electron plasma that causes usual metals to be conducting also causes them to be non-transmissive to electromagnetic waves. As well known at frequency omega below the plasma frequency omegap, the dielectric permittivity Epsilon 1 - omega pomegasquared becomes negative and the refractive index nomega epsilon muexp 12 where mu is the magnetic permeability becomes imaginary. Therefore, electromagnetic waves can not effectively propagate inside metals, but are instead reflected for good metals and both reflected and absorbed for less conductive metals. This point emphasizes that high transparency T and high electrical conductivity sigma are contradictory properties, and that the product T x sigma can not be maximized in the usual bulk materials found in nature. The motivation of the present work was to create photonic crystals PC, not of conventional dielectric type 1- 2, but of metallic periodic nanostructures or metallo-dielectric nanocomposite PC in which T x sigma can be maximized. Moreover optical and electronic properties can be made tunable because of the utilization of geometry and topology of interpenetrating components separated by a large interfacial area Asub upsilon in a photonic crystal structure.

Subject Categories:

  • Laminates and Composite Materials
  • Crystallography
  • Optics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE