Extraordinary magnetic field enhancement with metallic nanowire: role of surface impedance in Babinet's principle for sub-skin-depth regime.
We propose and analyze the "complementary" structure of a metallic nanogap, namely, the metallic nanowire for magnetic field enhancement. A huge enhancement of the field up to a factor of 300 was achieved. Introducing the surface impedance concept, we also develop and numerically confirm a new analytic theory which successfully predicts the field enhancement factors for metal nanostructures. Compared to the predictions of the classical Babinet principle applied to a nanogap, an order of magnitude difference in the field enhancement factor was observed for the sub-skin-depth regime nanowire.
Koo
Sukmo
S
Photonic Systems Laboratory, School of EECS, Seoul National University, Seoul 151-744, Korea.
Kumar
M Sathish
MS
Shin
Jonghwa
J
Kim
DaiSik
D
Park
Namkyoo
N