Negative refraction using true left-handed metamaterials
Author
Aydın, Koray
Advisor
Özbay, Ekmel
Date
2004Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
Left-handed materials and negative refraction attracted a great amount of
attention in recent years due to their unique physical properties. It is possible to
obtain a left-handed material by combining a novel artificial structure (split ring
resonator) and a wire structure periodically. We investigated the transmission and
reflection properties of split ring resonators (SRR), wires and composite
metamaterials consisting of SRR and wire structures. We have successfully
demonstrated true left-handed behavior in free space with a high transmission peak
(-1.2 dB). This is the highest transmission peak reported for a left-handed material.
The left-handed transmission band coincides exactly with the region where both
dielectric permittivity and magnetic permeability have negative values. We
proposed and demonstrated a new method to distinguish the magnetic resonance of
the SRR structures. We experimentally confirmed that composite metamaterial has a negative
refractive index, at the frequencies where left-handed transmission takes place.
Phase shift between consecutive numbers of layers of CMM is measured and
phase velocity is shown to be negative at the relevant frequency range. Refractive
index values obtained from the refraction experiments (-1.87) and the phase shift
experiments (-1.78) are in good agreement.
Keywords
Left-Handed MaterialNegative Phase Velocity
Negative Refraction
Photonic Band Gap
Effective Medium Theory
Negative Permeability
Negative Permittivity
Split Ring Resonator
Composite Metamaterial
Permalink
http://hdl.handle.net/11693/29567Collections
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