White-light total internal reflection microscopy for characterizing the optical properties of Ag-coated optical fiber tips

Applied Optics
Rui WangQian Tian

Abstract

The optical properties of the metallized tips used in tip-enhanced Raman spectroscopy (TERS) are vital to resonance enhancement. A white-light scattering-spectrum measuring setup based on total internal reflection microscopy is developed to characterize the optical responses of the metallized tips. The scattering spectra of the Ag-coated optical fiber tips are measured as a demonstration of the methodology and the performance of the setup. A prominent resonance band of 500-550 nm is observed experimentally, which can be interpreted as the result of the excitation of the localized surface plasmon resonance at the Ag-coated optical fiber tip. The optical responses of the Ag-coated optical fiber tips are simulated by a three-dimensional finite-difference time-domain method and the results are compared with the experiments. This method has great application potential in the selection and design of high-performance metallized tips for TERS and other apertureless near-field optical microscopy.

References

Feb 24, 2005·Journal of the American Chemical Society·Neil AndersonLukas Novotny
May 28, 2005·The Journal of Chemical Physics·A L DemmingD Richards
Apr 8, 2006·Annual Review of Physical Chemistry·Lukas Novotny, Stephan J Stranick
Jul 23, 2008·Physical Review Letters·Jens Steidtner, Bruno Pettinger
Apr 10, 2009·The Journal of Physical Chemistry. a·Maxim Sukharev, Tamar Seideman
Jun 25, 2007·Optics Express·Xudong CuiDaniel Erni

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Citations

Jan 18, 2018·Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy·Yasutaka KitahamaToshiaki Suzuki

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