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Highly anisotropic black phosphorous-graphene hybrid architecture for ultrassensitive plasmonic biosensing: Theoretical insight
- Source :
- 2D Materials. 5:025015
- Publication Year :
- 2018
- Publisher :
- IOP Publishing, 2018.
-
Abstract
- This study proposed a novel highly anisotropic surface plasmon resonance (SPR) biosensor employing emerging 2D black phosphorus (BP) and graphene atomic layers. Light absorption and energy loss were well balanced by optimizing gold film thickness and number of BP layers to generate the strongest SPR excitation. The proposed SPR biosensor was designed by the phase-modulation approach and is more sensitive to biomolecule bindings, providing 3 orders of magnitude higher sensitivity than the red-shift in SPR angle. Our results show the optimized configuration was 48 nm Au film coated with 4-layer BP crystal to produce the sharpest phase variation (up to 89.8975°), and lowest minimum reflectivity (1.9119 × 10−7). Detection sensitivity up to 7.4914 × 104 degree/refractive index unit is almost 4.5 times enhanced compared to monolayer graphene-based SPR sensors with 48 nm Au film. The anisotropic BP layers act as a polarizer, so the proposed SPR biosensor would exhibit optically tunable detection sensitivity, making it a promising candidate for exploring highly anisotropic platforms in biosensing.
- Subjects :
- Materials science
Graphene
business.industry
Mechanical Engineering
02 engineering and technology
General Chemistry
Polarizer
Orders of magnitude (numbers)
010402 general chemistry
021001 nanoscience & nanotechnology
Condensed Matter Physics
01 natural sciences
0104 chemical sciences
law.invention
Crystal
Mechanics of Materials
law
Optoelectronics
General Materials Science
Surface plasmon resonance
0210 nano-technology
business
Biosensor
Refractive index
Plasmon
Subjects
Details
- ISSN :
- 20531583
- Volume :
- 5
- Database :
- OpenAIRE
- Journal :
- 2D Materials
- Accession number :
- edsair.doi...........189c7c3962ff417664b7e9b03b08ae33