Generation of broadband longitudinal fields for applications to ultrafast tip-enhanced near-field microscopy

Kentaro Furusawa, Norihiko Hayazawa, Takayuki Okamoto, Takuo Tanaka, Satoshi Kawata

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

We report on the generation of broadband longitudinal fields within a tightly focused spot by using a segmented wave plate combined with a phase tailored broadband laser pulse. Their field distribution is characterized by observing the scattered light from a gold-coated glass fiber tip as it is scanned across the focused beam spot. It is observed that efficient coupling to the tip-enhanced field can be achieved over a broad bandwidth of more than 100nm, resulting in a positive contrast at the centre of the focus in the spectrally resolved Rayleigh scattering image. Temporal characteristics of the nonlinear excitation at the tip apex observed by using the fringe resolved autocorrelation technique indicate the possibilities of ultrafast spectroscopy by utilizing the tip-enhanced longitudinal fields.

Original languageEnglish
Pages (from-to)25328-25336
Number of pages9
JournalOptics Express
Volume19
Issue number25
DOIs
Publication statusPublished - 2011 Dec 5

ASJC Scopus subject areas

  • Atomic and Molecular Physics, and Optics

Fingerprint Dive into the research topics of 'Generation of broadband longitudinal fields for applications to ultrafast tip-enhanced near-field microscopy'. Together they form a unique fingerprint.

Cite this