Effective-medium theory of a heterogeneous medium with individual grains having a nonlocal dielectric function

1984 ◽  
Vol 30 (10) ◽  
pp. 6108-6117 ◽  
Author(s):  
G. S. Agarwal ◽  
Ramarao Inguva
Keyword(s):  
Dielectric Function ◽  
Heterogeneous Medium ◽  
Effective Medium Theory ◽  
Effective Medium ◽  
Medium Theory ◽  
Individual Grains

Quantum Effects on the Dielectric Function of Porous Silicon

2000 ◽  
Vol 638 ◽  
Author(s):  
M. Cruz ◽  
S. F. Díaz ◽  
C. Wang ◽  
Y. G. Rubo ◽  
J. Tagüeña-Martínez
Keyword(s):  
Porous Silicon ◽  
Dielectric Function ◽  
Imaginary Part ◽  
Effective Medium Theory ◽  
Tight Binding ◽  
Exact Result ◽  
Effective Medium ◽  
Tight Binding Approximation ◽  
Medium Theory ◽  
Microscopic Models

AbstractIn this work, the imaginary part of the dielectric function of porous silicon is studied by means of both the tight-binding and the effective medium approaches, in the latter exact result is obtained for the case of 50% porosity. Within the tight-binding approximation, the dielectric function is calculated by using the interconnected and chessboard-like supercell models for the Si skeleton. These microscopic models give quantitatively similar results, which are by a factor of three larger than those from the effective medium theory.

Effective Medium Theory of DNA-linked Gold Nanoparticle Aggregates:Effect of Aggregate Shape

2001 ◽  
Vol 635 ◽  
Author(s):  
Anne A. Lazarides ◽  
K. Lance Kelly ◽  
George C. Schatz
Keyword(s):  
Dielectric Function ◽  
Effective Medium Theory ◽  
Effective Medium ◽  
Absorption Feature ◽  
Medium Theory ◽  
Spectral Changes ◽  
Comparison With Experiment ◽  
Nanoparticle Aggregates ◽  
Aggregate Shape ◽  
Good Agreement

AbstractWe present a dynamical effective medium theory (EMT) of the dielectric properties of nanoparticle aggregates formed from DNA-linked gold nanoparticles. Experimental measurements show that such aggregateshave reduced UV extinction and plasmon bands that are considerably red-shifted and broadened relative to the plasmon absorption feature observed in spectra of dispersed colloid. The EMT, which can be used to reproduce the observed spectral changes, is tested by comparing aggregate spectra calculated using the EMT dielectric function with spectra from explicit coupled particle calculations, and good agreement is found. The EMT dielectric function is used as well in discrete dipole calculations to calculate extinction spectra for a variety of aggregate shapes not amenable to analytic solution, and the sensitivity of the spectra to aggregate shape is examined. We find that the spectra are only weakly sensitive to aggregate shape, and conclude that, when calculating extinction of the DNA-linked aggregates for comparison with experiment, spherical shapes can be assumed.

Effective medium theory and the attenuation of graphite fiber composites

1993 ◽  
Vol 73 (7) ◽  
pp. 3441-3445 ◽  
Author(s):  
Herbert Überall ◽  
Barbara F. Howell ◽  
Earl L. Diamond
Keyword(s):  
Effective Medium Theory ◽  
Fiber Composites ◽  
Effective Medium ◽  
Graphite Fiber ◽  
Medium Theory

From the Huckel model to effective-medium theory

1991 ◽  
Vol 3 (40) ◽  
pp. 7757-7762 ◽  
Author(s):  
H Hakkinen ◽  
J Mansikka-aho ◽  
M Manninen
Keyword(s):  
Effective Medium Theory ◽  
Effective Medium ◽  
Medium Theory
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