ZhETF, Vol. 137,
p. 220 (February 2010)
(English translation - JETP,
Vol. 110, No. 2,
available online at www.springer.com
ELECTRIC FIELD ENHANCEMENT BETWEEN TWO PARALLEL CYLINDERS DUE TO PLASMONIC RESONANCE
Received: September 25, 2009
We theoretically examine the electric field enhancement in the narrow gap between two parallel cylinders due to the plasmonic resonance. The resonance condition and the field enhancement factor are found explicitly. It is shown that the resonance occurs at the frequencies lower than the plasma frequency. This effect results from the special geometry: the gap width between parallel cylinders is much smaller than their radii. It is also shown that the enhancement coefficient is much larger than the one for a single cylinder and is determined together with the resonance frequency by the system geometry.