Negative Refractive Index Metasurfaces for Enhanced Biosensing
Abstract
In this paper we review some metasurfaces with negative values of effective refractive index, as scaffolds for a new generation of surface plasmon polariton-based biological or chemical sensors. The electromagnetic properties of a metasurface may be tuned by its full immersion into analyte, or by the adsorption of a thin layer on it, both of which change its properties as a plasmonic guide. We consider various simple forms of plasmonic crystals suitable for this purpose. We start with the basic case of a freestanding, electromagnetically symmetrical plasmonic slab and analyze different ultrathin, multilayer structures, to finally consider some two-dimensional "wallpaper" geometries like split ring resonator arrays and fishnet structures. A part of the text is dedicated to the possibility of multifunctionalization where a metasurface structure is simultaneously utilized both for sensing and for selectivity enhancement. Finally we give an overview of surface-bound intrinsic electromagnet...ic noise phenomena that limits the ultimate performance of a metasurfaces sensor.
Keywords:
plasmonics / optical metamaterials / artificial nanomembranes / long range surface plasmons polaritons / chemical sensors / biosensorsSource:
Materials, 2011, 4, 1, 1-36Publisher:
- MDPI AG
Projects:
- Qatar National Research Fund: NPRP - 09-462-1-074
- Mikrosistemske, nanosistemske tehnologije i komponente (RS-11027)
- Nelinearni dinamički fenomeni u fotorefraktivnim sredinama, tečnim kristalima, plazmi i dvostruko negativnim materijalima (RS-141031)
- MULTIPLAT - Biomimetic Ultrathin Structures as a Multipurpose Platform for Nanotechnology-Based Products (EU-228943)
DOI: 10.3390/ma4010001
ISSN: 1996-1944
PubMed: 28879974