Hot-Spot Engineering in 3D Multi-Branched Nanostructures: Ultrasensitive Substrates for Surface-Enhanced Raman Spectroscopy
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- 作者：Manohar Chirumamilla ; Anisha Chirumamilla ; Alexander S. Roberts ; Remo Proietti Zaccaria ; Francesco De Angelis ; Peter Kjæ ; r Kristensen ; Roman Krahne ; Sergey I. Bozhevolnyi ; Kjeld Pedersen and Andrea Toma
- 刊名：Advanced Optical Materials
- 出版年：2017
- 出版时间：February 16, 2017
- 年：2017
- 卷：5
- 期：4
- 全文大小：1822K
- ISSN：2195-1071
文摘
The detection of probe molecules at ultralow concentrations, even at the single-molecule level, can be addressed with the breakthrough concept of plasmonic hot-spot engineering. In view of that, the fabrication of nanostructures endowed with sub-10 nm gaps and extremely large near-field enhancement has gained increasing attention, becoming a key-condition for improved sensitivity. The present work demonstrates a new perspective in ultrasensitive detection by engineering every individual plasmonic nanostructure with a giant electric field confinement and superior hot-spot densities, thus eliminating the need for extremely narrow interparticle separations.