Infrared imaging of single nanoparticles via strong field enhancement in a scanning nanogap

被引：87

作者：

Cvitkovic, A. ^{[1
]}

Ocelic, N.

Aizpurua, J.

Guckenberger, R.

Hillenbrand, R.

机构：

[1] Max Planck Inst Biochem, Nano Photon Grp, D-82152 Martinsried, Germany

[2] Max Planck Inst Biochem, Abt Mol Strukturbiol, D-82152 Martinsried, Germany

[3] Donostia Int Phys Ctr, San Sebastian 20018, Spain

来源：

PHYSICAL REVIEW LETTERS | 2006年 / 97卷 / 06期

关键词：

D O I：

10.1103/PhysRevLett.97.060801

中图分类号：

O4 [物理学];

学科分类号：

0702 ;

摘要：

We demonstrate nanoscale resolved infrared imaging of single nanoparticles employing near-field coupling in the nanoscopic gap between the metal tip of a scattering-type near-field optical microscope and the substrate supporting the particles. Experimental and theoretical evidence is provided that highly reflecting or polariton-resonant substrates strongly enhance the near-field optical particle contrast. Using Si substrates we succeeded in detecting Au particles as small as 8 nm (<lambda/1000) at midinfrared wavelengths of about lambda=10 mu m. Our results open the door to infrared spectroscopy of individual nanoparticles, nanocrystals, or macromolecules.

引用

页数：4

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