Highly efficient heating assisted tip-enhanced Raman spectroscopy

Alvarado Tarun; Norihiko Hayazawa; Masashi Motohashi; Satoshi Kawata

doi:10.1117/12.793999

28 August 2008 Highly efficient heating assisted tip-enhanced Raman spectroscopy

Alvarado Tarun, Norihiko Hayazawa, Masashi Motohashi, Satoshi Kawata

Proceedings Volume 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV; 70330C (2008) https://doi.org/10.1117/12.793999
Event: NanoScience + Engineering, 2008, San Diego, California, United States

Abstract

We present a tip-enhanced Raman spectroscopy (TERS) system that permits efficient illumination and detection of optical properties in the visible range to obtain high contrasts Raman signals from strained silicon (ε-Si) assembled on silicon germanium substrate using an edge filter. The cut-off investigation in a depolarized TERS configuration. We overshadow wavelength of the edge filter is tuned by changing the angle of incident beam to deliver high incident power and effectively collect scattered near-field signals for nanoscopic strong far-field background signals from Raman active materials by utilizing the results obtained from depolarized surface-enhanced Raman scattering experiments in conjunction with silicon Raman tensor calculation to quantify which polarizer, analyzer and sample azimuth combination gives the minimum far-field signals. Here, we utilize the s-polarization instead of p-polarized light in conjunction with polarization properties of ε-Si to obtain a high contrast Raman signal. We found that for imaging Raman active and bulk crystalline materials such as silicon, background signal suppression (s-illumination) is more important than the field enhancement with strong far-field signal levels (p-polarization). The utilization of an edge filter for shorter collection time, depolarized configuration for higher contrast and tip heating for higher resolution are discussed.

Citation Download Citation

Alvarado Tarun, Norihiko Hayazawa, Masashi Motohashi, and Satoshi Kawata "Highly efficient heating assisted tip-enhanced Raman spectroscopy", Proc. SPIE 7033, Plasmonics: Nanoimaging, Nanofabrication, and Their Applications IV, 70330C (28 August 2008); https://doi.org/10.1117/12.793999

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