Measurement of plasmon response functions of nanostructures with femtosecond laser cross-correlation microscopy toward spatiotemporal plasmon control

The localized plasmon resonance at noble metal nanostructures has been devoting much attention to produce an interaction platform between light and matter at nanometer size. Currently, spatiotemporal control over localized plasmon was demonstrated using a vector pulse shaping technique for femtosecond lasers [1]. In order to achieve deterministic control for localized plasmon or surface plasmon-polariton (SPP) at nanostructures, temporal characterization of femtosecond plasmon is highly required. So far, temporal characterization of ultrafast plasmon using PEEM has been reported [1,2]. We apply a new characterization method of ultrafast plasmon: electrical-field cross-correlation imaging using femtosecond laser dark-field microscopy or SNOM. We set our research goal at spatiotemporal control of plasmon or SPP generated by ultra-broadband laser pulses, which are shaped based on the plasmon response function [3] measured with our novel methods.