Journal
ADVANCED MATERIALS
Volume 30, Issue 4, Pages -Publisher
WILEY-V C H VERLAG GMBH
DOI: 10.1002/adma.201704442
Keywords
Brewster effect; clinical biosensors; perfect absorbers; plasmonic dipoles; specular reflection
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Funding
- School of Chemical Engineering at the Aalto University, Finland
- Helmholtz Association (Initiative and Networking Fund) [VH-NG-523]
- Helmholtz-Zentrum Geesthacht, Germany
- Academy of Finland
- German Research Foundation (DFG) [SFB677]
- BMBF [P2N-01EY1103]
- Cluster of Excellence Inflammation at Interfaces of Schleswig-Holstein, Kiel, Germany
- European Union [701597]
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Plasmonic dipoles are famous for their strong absorptivity rather than their reflectivity. Here, the as-yet unknown specular reflection and the Brewster effect of ultrafine plasmonic dipoles, metaparticles, are introduced and exploited as the basis of new design rules for advanced applications. A configuration of Plasmonic metaparticles on a blackbody is demonstrated and utilized for the design of a tailored perfect-colored absorber and for visual detection of environmental dielectrics that is not readily done by extinction plasmonics. Moreover, the Plasmonic Brewster Wavelength (PBW) effect is introduced as a new platform for the naked-eye and bulk biodetection of analytes. The technique operates based on slight changes of molecular polarizability which is not detectable via conventional plasmon resonance techniques. As a specific highlight, the clinical applicability of the PBW method is demonstrated while addressing the transduction plasmonic techniques' challenge in detection of bulk refractive index changes of the healthy and diseased human serum exosomes. Finally, the sputtering-based fabrication method used here is simple, inexpensive, and scalable, and does not require the sophisticated patterning approach of lithography or precise alignment of light coupling for the biodetection.
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