Nanoscale polymer recognition by spectral signature in scattering infrared near-field microscopy

被引：175

作者：

Taubner, T ^{[1
]}

Hillenbrand, R

Keilmann, F

机构：

[1] Max Planck Inst Biochem, Abt Mol Strukturbiol, D-82152 Munich, Germany

[2] Ctr NanoSci, D-82152 Munich, Germany

[3] Max Planck Inst Biochem, Nano Photon Grp, D-82152 Munich, Germany

来源：

APPLIED PHYSICS LETTERS | 2004年 / 85卷 / 21期

关键词：

D O I：

10.1063/1.1827334

中图分类号：

O59 [应用物理学];

学科分类号：

摘要：

We demonstrate-for a typical polymer vibrational infrared line-that scattering-type "apertureless" optical near-field microscopy features a spectral signature that differs characteristically from far-field absorption. Theory predicts a dispersion-like amplitude spectrum (besides an absorption-like, bell-shaped phase spectrum). This signature is experimentally verified for a vibrational resonance of PMMA, by probing with a CO laser tuned from 5.5 to 6 mum. We apply this signature to identify PMMA in the near-field imaging of a nanostructured PMMA/PS polymer blend, at <70 nm resolution. Our results suggest a potentially quantitative chemometry based on near-field infrared vibrational fingerprints with spatial resolution that could reach 10 nm. (C) 2004 American Institute of Physics.

引用

页码：5064 / 5066

页数：3

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