Experimental demonstration of transmission enhancement through subwavelength apertures at microwave frequencies
Author(s)
Advisor
Özbay, EkmelDate
2012Publisher
Bilkent University
Language
English
Type
ThesisItem Usage Stats
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Abstract
Metamaterials are artificial materials with novel electromagnetic characteristics.
They are used in many applications including imaging, super lenses, cloaking,
transmission enhancement, beaming and recently in nano applications. One of
the major building blocks is the split ring resonators (SRR). We can construct
metamaterials by using a single or an array of the SRRs.
In this thesis, enhanced transmission through subwavelength apertures, which
is one of the applications of metamaterials, is obtained by using various split
ring resonators configurations. We demonstrated transmission enhancement with
Connected Split Ring Resonators (CSRRs), Omega-like Split Ring Resonators
and Stack-like Split Ring Resonators through circular and rectangular
subwavelength apertures experimentally and numerically at the microwave frequencies.
We report the highest experimental transmission enhancement results
in the literature so far. Besides high factors, we also obtained multi-peak resonant
characteristics with Stack-like SRR designs.
Furthermore, we analyzed these various SRR samples numerically in order to
understand the resonance behavior. We also discuss the effects of shorting the
loops, omitting the components of the SRRs and aperture geometry to the resonance
frequency. Finally, we applied Tight Binding methods to analyze the multi-peak
characteristics of the Stack-like SRR design.
Keywords
MetamaterialSplit Ring Resonator
Transmission Enhancement
Diffractions and Gratings
Subwavelength apertures