Revealing Nanostructures through Plasmon Polarimetry
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- 作者：Marie-Elena Kleemann ; Jan Mertens ; Xuezhi Zheng ; Sean Cormier ; Vladimir Turek ; Felix Benz ; Rohit Chikkaraddy ; William Deacon ; Anna LombardiVictor V. Moshchalkov ; Guy A. E. Vandenbosch ; Jeremy J. Baumberg
- 刊名：ACS Nano
- 出版年：2017
- 出版时间：January 24, 2017
- 年：2017
- 卷：11
- 期：1
- 页码：850-855
- 全文大小：393K
- ISSN：1936-086X
文摘
Polarized optical dark-field spectroscopy is shown to be a versatile noninvasive probe of plasmonic structures that trap light to the nanoscale. Clear spectral polarization splittings are found to be directly related to the asymmetric morphology of nanocavities formed between faceted gold nanoparticles and an underlying gold substrate. Both experiment and simulation show the influence of geometry on the coupled system, with spectral shifts Δλ = 3 nm from single atoms. Analytical models allow us to identify the split resonances as transverse cavity modes, tightly confined to the nanogap. The direct correlation of resonance splitting with atomistic morphology allows mapping of subnanometre structures, which is crucial for progress in extreme nano-optics involving chemistry, nanophotonics, and quantum devices.