High-sensitivity surface plasma resonant cavity sensor corrected through graphene

Abstract

The invention discloses a high-sensitivity surface plasma resonant cavity sensor corrected through graphene, and the sensor is characterized in that the sensor comprises a substrate layer and a metallayer which are overlapped from the bottom to the top. The metal layer is provided with a resonant cavity passing through the upper and lower surfaces of the metal layer. The periphery of the resonantcavity is symmetrically provided with a recessed first straight waveguide and a recessed second straight waveguide, wherein the bottoms of the first and second straight waveguides are each provided with a single graphene layer which is in overlapped connection with the substrate layer. The sensor provided by the invention is small in size, is quick in response, is simple in preparation process, is high in sensitivity, is high in Q value, and can achieve the nanometer-level sensing in the fields of biological and medical detection.

Description

technical field [0001] The invention relates to the field of optical communication technology and sensing, in particular to a high-sensitivity surface plasmon resonant cavity sensor modified by graphene. Background technique [0002] Surface plasmon polariton (SPP) is an electromagnetic mode between light waves and migratable surface charges realized by changing the subwavelength structure of the metal surface, which can support surface plasmon waves transmitted at the interface between metal and medium. SPP-based devices have small size, fast response, and are not limited by the diffraction limit. This unique property makes it play an important role in the fields of nanoscale manipulation of light energy, high-sensitivity sensors, high response, and anti-magnetic interference. important role. [0003] "Nano Express" published the article "Planar Metamaterial Analogue of Electromagnetically Induced Transparency for Plasmonic Sensing" in 2010. The research team proposed a se...

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Problems solved by technology

[0004] However, as far as the current situation is concerned, despite the continuous improvement of the sensitivity of the sensor by researchers, the sensitivity of the sensor is still low. At the same time, the preparation method of the sensor is too complicated, and it is very difficult to fill the sensing medium, which is difficult to meet the requirements of mass production.

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