Laser & Optoelectronics Progress, Volume. 60, Issue 15, 1517001(2023)
Ultrasensitive Terahertz Biosensor Based on Graphene Regulation Near Its Dirac Point and Electromagnetically Induced Transparency
This paper describes a terahertz metasurface biosensor with a graphene and metallic aluminum composite structure. The aluminum structure is designed to form an electromagnetically induced transparency-like resonance. A layer of wet graphene is transferred onto the structure. The Fermi energy level of the graphene is controlled by the incorporation of silk proteins into the graphene, which causes the amplitude of the sensor's transmission spectrum to change. The experiment reveals that the detection limit is 0.35 ng/mL. The sensor is analyzed using the electromagnetic wave regulation characteristics of the Dirac point of graphene, as well as the coupling model. This biosensor enables the highly sensitive detection of trace proteins in the biomedical field.
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Chengcheng Huang, Yonggang Zhang, Lanjü Liang, Haiyun Yao, Wenjia Liu, Fu Qiu. Ultrasensitive Terahertz Biosensor Based on Graphene Regulation Near Its Dirac Point and Electromagnetically Induced Transparency[J]. Laser & Optoelectronics Progress, 2023, 60(15): 1517001
Category: Medical Optics and Biotechnology
Received: Jun. 6, 2022
Accepted: Jul. 7, 2022
Published Online: Aug. 11, 2023
The Author Email: Zhang Yonggang (ygzhang2000@163.com), Liang Lanjü (lianglanju123@163.com)