Ultra-sensitive biosensor with hybrid coupling between molybdenum disulfide thin film and photonic waveguide mode

Hongdi Jiang; Gaige Zheng; Wei-Feng Rao

Results in Physics (Jun 2019)

Ultra-sensitive biosensor with hybrid coupling between molybdenum disulfide thin film and photonic waveguide mode

Hongdi Jiang,
Gaige Zheng,
Wei-Feng Rao

Affiliations

Hongdi Jiang: Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science &Technology, Nanjing 210044, China
Gaige Zheng: Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science &Technology, Nanjing 210044, China; Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing 210044, China
Wei-Feng Rao: Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science &Technology, Nanjing 210044, China; Jiangsu Collaborative Innovation Center on Atmospheric Environment and Equipment Technology (CICAEET), Nanjing University of Information Science & Technology, Nanjing 210044, China; Department of Materials Physics, and IEMM, Nanjing University of Information Science & Technology, Nanjing 210044, China; Corresponding author at: Jiangsu Key Laboratory for Optoelectronic Detection of Atmosphere and Ocean, School of Physics and Optoelectronic Engineering, Nanjing University of Information Science &Technology, Nanjing 210044, China.

Journal volume & issue: Vol. 13

Abstract

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Coupling between planar waveguide modes (WGMs) with monolayer molybdenum disulfide (MoS2) is analyzed. A low quality factor waveguide is attached with MoS2 to generate a broad resonance. While another high quality factor waveguide provides an extra sharper resonance. Fano resonance (FR) arising from the coupling between the excited WGMs is discussed and confirmed through numerical calculation. Electric field distributions at the resonance position are also presented to verify the existence of FR. It is demonstrated that the FR shape can be engineered by the structural parameters and applied in the ultrasensitive biosensor to enhance the intensity sensitivity. A maximal sensitivity of 9630 RIU−1 is obtained under the optimal condition. Our research reveals the potential application prospect in optical sensing and detection with high sensitivity based on coupling between waveguide modes with MoS2. Keywords: Fano resonance, Molybdenum disulfide, Optical sensor, Waveguide mode

Published in Results in Physics

ISSN: 2211-3797 (Online)
Publisher: Elsevier
Country of publisher: Netherlands
LCC subjects: Science: Physics
Website: http://www.journals.elsevier.com/results-in-physics/

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