Abstract
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.
Highlights
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
Mapping the electric field distribution using near-field scanning optical microscopy (NSOM) may disturb the field distribution prevent a reliable measurement of the mode volume
We develop a method for measuring deep sub-wavelength mode volume of plasmonic antennas by detecting the far-field signal without introducing any mode perturbation
Summary
Univeristy of California Berkeley,Nano-scale Science and Engineering Center,3112 EtcheVerry Hall,Berkeley,CA,94720.
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