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Enhancement of Raman scattering by two orders of magnitude using photonic nanojet of a microsphere

机译:使用微球的光子纳米射流将拉曼散射增强两个数量级

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摘要

The enhancement of Raman signal is observed on excitation through a single microsphere. The dependence of the enhancement ratio (ER) on various parameters viz., numerical aperture (NA) of the microscopic objective lens, pump wavelength, size and refractive index of the microsphere has been studied. The enhancement has been explained due to interaction of the increased field of the photonic nanojet emerging from the single microsphere. The photonic nanojet induced ER of Raman peaks of silicon wafer and cadmium ditelluride is reported here. It is observed for the first time that by suitable selection of the experimental parameters, it is possible to enhance the Raman signal by approximately two orders of magnitude.
机译:通过单个微球激发观察到拉曼信号增强。研究了增强比(ER)对各种参数的依赖,即微观物镜的数值孔径(NA),泵浦波长,微球体的尺寸和折射率。由于来自单个微球的光子纳米射流的增加场的相互作用,已经解释了这种增强。本文报道了光子纳米射流诱导的硅片和二碲化镉拉曼峰的ER。首次观察到,通过适当选择实验参数,可以将拉曼信号增强大约两个数量级。

著录项

  • 来源
    《Journal of Applied Physics》 |2011年第10期|p.145-148|共4页
  • 作者单位

    Physics Department, Indian Institute of Technology Madras, Chennai 600036, India;

    Physics Department, Indian Institute of Technology Madras, Chennai 600036, India;

    Physics Department, Indian Institute of Technology Madras, Chennai 600036, India;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);
  • 原文格式 PDF
  • 正文语种 eng
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