期刊
ACS NANO
卷 11, 期 12, 页码 12167-12173出版社
AMER CHEMICAL SOC
DOI: 10.1021/acsnano.7b05269
关键词
surface plasmons; multiresonant; subwavelength aperture; nanoantenna; polarization control
类别
资金
- Ambizione program of the Swiss National Science Foundation
- Swiss National Science Foundation [200021-146747]
- Netherlands Organisation for Scientific Research (NWO, Rubicon Grant) [680-50-1513]
- Swiss National Science Foundation (SNF) [200021_146747] Funding Source: Swiss National Science Foundation (SNF)
Combining the ability to localize electromagnetic fields at the nanoscale with a directional response, plasmonic antennas offer an effective strategy to shape the far-field pattern of coupled emitters. Here, we introduce a family of directional multiresonant antennas that allows for polarization-resolved spectral identification of fluorescent emission. The geometry consists of a central aperture surrounded by concentric polygonal corrugations. By varying the periodicity of each axis of the polygon individually, this structure can support multiple resonances that provide independent control over emission directionality for multiple wavelengths. Moreover, since each resonant wavelength is directly mapped to a specific polarization orientation, spectral information can be encoded in the polarization state of the out scattered beam. To demonstrate the potential of such structures in enabling simplified detection schemes and additional functionalities in sensing and imaging applications, we use the central subwavelength aperture as a built-in nanocuvette and manipulate the fluorescent response of colloidal-quantum-dot emitters coupled to the multiresonant antenna.
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