Highly anisotropic black phosphorous-graphene hybrid architecture for ultrassensitive plasmonic biosensing: Theoretical insight
- 9 February 2018
- journal article
- research article
- Published by IOP Publishing in 2D Materials
- Vol. 5 (2), 025015
- https://doi.org/10.1088/2053-1583/aaae21
Abstract
This study proposed a novel highly anisotropic surface plasmon resonance (SPR) biosensor employing emerging two-dimensional 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 exhibits optically tunable detection sensitivity, making it a promising candidate for exploring highly anisotropic platforms in biosensing.Keywords
Funding Information
- Guangdong Natural Science Foundation Innovation Team (2014A030312008)
- China Postdoctoral Science Foundation funded project (2017M612725)
- Hong Kong, Macao, and Taiwan cooperation innovation platform & major projects of international cooperation in Colleges and Universities in Guangdong Province (2015KGJHZ002)
- National Natural Science Foundation of China (31771584, 61378091, 61405123, 61525503, 61527827, 61605121, 61620106016, 61775145, 61775148)
- National Basic Research Program of China (2015CB352005)
- 3rd NRF-ANR joint grant (NRF2017-NRF-ANR002 2DPS)
- Shenzhen Basic Research Project (GJHZ20160226202139185, GRCK2017042110420047, JCYJ20150930104948169, JCYJ20160308093035903, JCYJ20160328144746940, JCYJ20160422151611496, JCYJ20170302142902581, JCYJ20170412105003520, JCYJ20170412110212234)
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