Optimising tip-enhanced optical microscopy
Optimising tip-enhanced optical microscopy
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DOI：
10.1002/jrs.2382
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发表时间：
2009-10-01
影响因子：
2.5
通讯作者：
Elfick, Alistair
中科院分区：
文献类型：
--
作者：
Downes, Andrew;Mouras, Rabah;Elfick, Alistair
我们讨论了针尖增强光学显微镜的范围--即绘制 10-20 纳米尺度的散射光、荧光、拉曼和相干反斯托克斯拉曼散射 (CARS) 信号。通过测量和有限元模拟，我们解释了所有这些成像模式的最佳针尖材料和尺寸以及照明波长。我们还表明，观测到的 50-100 mu W 照明功率极限是由于针尖顶点下方几十度的温升造成的，很可能与针尖顶点区域的水分蒸发有关。这有两个重要的影响：即使在 "空气 "中成像，针尖也被水包围；成像时，针尖和样品都会被加热。我们将以拉曼和 CARS 为重点，讨论如何使这两种针尖增强光学显微镜的成像速度与衍射受限的光学显微镜相同。版权所有 (C) 2009 加拿大女王陛下。John Wiley & Sons 出版。Ltd. 出版。
We discuss the range of tip-enhanced optical microscopies - namely mapping scattered light, fluorescence, Raman and coherent anti-Stokes Raman scattering (CARS) signals on the scale of 10-20 nm. Through the use of measurements and finite-element simulations, we explain what the optimum tip materials and sizes are and illumination wavelengths to use for all these modes of imaging. We also show that the observed limit of 50-100 mu W of illumination power is due to a temperature rise of tens of degrees beneath the tip apex, and is most likely linked to the evaporation of water from the tip apex region. This has two important implications - that the tip is surrounded by water even when imaging 'in air', and that the tip and sample are both heated when imaging. With emphasis on Raman and CARS, we discuss how both these types of tip-enhanced optical microscopy can be made about as fast as their diffraction-limited counterparts. Copyright (C) 2009 Her Majesty the Queen in right of Canada. Published by John Wiley & Sons. Ltd.