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Ultrafast Surface Plasmon Polariton Pulses Observed with a Dual-probe Scanning Near-field Optical Microscopy (DSNOM) Utilizing Plasmon Nano-focusing

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Abstract

Dual-probe scanning near-field optical microscopy consisting of ultrafast surface-plasmon polariton nanofocusing for excitation and spectral interferometry for detection is constructed to observe spatiotemporal dynamics of surface-plasmon polariton (SPP) pulses. Nano focusing of SPP excited by femtosecond laser pulses on a gold taper with a tip radius of ~20 nm is deterministically controlled. We achieve spatiotemporal resolution for probing of 100 nm and 10 fs.

© 2016 Optical Society of America

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