Zhang, ShuangPark, YongshikLiu, YongminZentgraf, ThomasZhang, Xiang2022-01-171094-4087http://hdl.handle.net/1885/258427Light-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.This work was supported by the U. S. Army Research Office (ARO) MURI program 50432- PH-MUR.application/pdfen-AU© 2010 Optical Society of AmericaElectric fieldsPlasmonsElectric field distributionsExperimental determinationFar fieldFar field measurementField distributionInteraction strengthLight-matter interactionsMode volumeNano scaleOptical forceOptical modesReliable measurement201010.1364/OE.18.0060482020-12-06