期刊
NANO LETTERS
卷 12, 期 2, 页码 546-550出版社
AMER CHEMICAL SOC
DOI: 10.1021/nl204071e
关键词
Plasmonics; wavefront shaping; interferometry; microscopy; Bloch modes
类别
资金
- Nederlandse Organisatie voor Wetenschappelijk Onderzoek
We study and actively control the coherent properties of surface plasmon polaritons (SPPs) optically excited on a nanohole array. Amplitude and phase of the optical excitation are externally controlled via a digital spatial light modulator (SLM) and SPP interference fringe patterns are designed and observed with high contrast. Our interferometric observations reveal SPPs dressed with the Bloch modes of the periodic nanostructure. The momentum associated with these dressed plasmons (DP) is highly dependent on the grating period and fully matches our theoretical predictions. We show that the momentum of DP waves can, in principle, exceed the SPP momentum. Actively controlling DP waves via programmable phase patterns offers the potential for high field confinement applicable in lithography, surface enhanced Raman scattering, and plasmonic structured illumination microscopy.
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