Focusing surface plasmons with a plasmonic lens.
We report the focusing of surface plasmon polaritons by circular and elliptical structures milled into optically thick metallic films or plasmonic lenses. Both theoretical and experimental data for the electromagnetic nearfield is presented. The nearfield is mapped experimentally using nearfield scanning optical microscopy and plasmonic lithography. We find that the intensity at the focal points of the plasmonic lenses increases with size.
Liu
Zhaowei
Z
NSF Nanoscale Science and Engineering Center (NSEC), 5130 Etcheverry Hall, University of California, Berkeley, California 94720, USA.
Steele
Jennifer M
JM
Srituravanich
Werayut
W
Pikus
Yuri
Y
Sun
Cheng
C
Zhang
Xiang
X