Far-field measurement of ultra-small plasmonic mode volume.
Light-matter interaction can be greatly enhanced in nano-scale plasmonic cavities with tightly confined optical mode, where the mode volume determines the interaction strength. The experimental determination of the mode volume of plasmonic elements is therefore of fundamental importance. Mapping the electric field distribution using near-field scanning optical microscopy (NSOM) may disturb the field distribution hence prevent a reliable measurement of the mode volume. Here, we develop a non-pertubative technique to experimentally determine the mode volume of plasmonic resonators in the far field through a unique optical force method.
Zhang
Shuang
S
Nanoscale Science and Engineering Center, 3112 Etcheverry Hall, University of California,Berkeley, California 94720, USA.
Park
Yong-Shik
YS
Liu
Yongmin
Y
Zentgraf
Thomas
T
Zhang
Xiang
X
D003198:Computer Simulation; D008962:Models, Theoretical; D011829:Radiation Dosage; D011874:Radiometry / Q000379:methods*; D020349:Surface Plasmon Resonance / Q000379:methods*