Junghoon Jahng, Faezeh Tork Ladani, Ryan Muhammad Khan, Xiaowei Li, Eun Seong Lee, and Eric Olaf Potma
A new method is presented for visualizing the electric field distributions associated with propagating surface-plasmon-polariton (SPP) modes directly in the near-field. The method is based on detecting the photo-induced gradient force exerted by the evanescent field onto a sharp and polarizable tip. Using a photo-induced force microscope (PiFM), images of propagating SPPs are obtained on flat gold surfaces.
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