A Baseline Survey of the Resonances and Anti-Resonances of Circular and Square Ring Resonators and Nano-Antennas

Arni (Research School of Engineering)

SOLAR SEMINAR SERIES

DATE: 2012-04-12
TIME: 16:00:00 - 17:00:00
LOCATION: Ian Ross Seminar Room
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ABSTRACT:
Metamaterial characteristics arise from the individual resonances and anti-resonances of their constituent, small loop structures, called "open" or "split-ring resonators" (SRRs). Similarly, nano-loop antennas have recently been shown helpful in managing light capture, focusing and beam directivity due to their resonances and anti-resonances. The archetype for both categories of these objects is the large-scale circular loop antenna operating at radio frequencies. Knowledge of how this antenna resonates leads to a deep understanding of how nano-loops, in general, work.

The complete derivation from first principles of the current distribution and input impedance of the archetypal loop was accomplished in the 1950s. The impedance function for the circular loop is of fundamental importance, because it gives all of the basic resonances and anti-resonances of an antenna. Indeed, all SRRs and all nano-antennas have impedance functions that look like that of their archetype. This talk links SRRs and nano-antennas to the archetype, explains why and how they are similar, and reports on a systematic survey of the resonances and anti-resonances of cylindrical and square loops from the MW region through the lower THz regime into the optical region.
BIO:
He has two masters degrees. One in engineering, and interestingly in comparative religion. Come to his talk and see why he is the master master.