研究目的
Investigating the high-sensitivity optical sensor at terahertz frequencies based on a composite structure containing a one-dimensional photonic crystal coated with a layer of monolayer graphene for biosensor or gas-sensor applications.
研究成果
The proposed terahertz refractive index sensor based on a graphene–Bragg reflector composite structure demonstrates high sensitivity due to the excitation of strong resonance modes. The sensitivity and FOM are significantly influenced by the thickness and refractive index of the sensing medium and the optical parameters of graphene. Proper parameter settings can achieve a maximal sensitivity of 407.36 /RIU, making the sensor promising for applications in the optical biosensor industry.
研究不足
The study does not consider the absorption in the sensing medium, which could affect the sensitivity performance of the sensor, especially in the terahertz band. Additionally, the relaxation time of graphene is difficult to change once the graphene is prepared, which could limit the tunability of the sensor's sensitivity.
1：Experimental Design and Method Selection:
The study involves designing a terahertz sensor by inserting a sensing medium between a polymethylpentene (TPX)/SiO2 Distributed Bragg Reflector (DBR) and a monolayer graphene film in a vertically stacked structure. The methodology includes the use of a transfer matrix to calculate the reflectance of the proposed structure.
2：Sample Selection and Data Sources:
The samples include a sensing medium, graphene film, and a one-dimensional photonic crystal (1D PC) formed by alternately stacking dielectric A and dielectric B.
3：List of Experimental Equipment and Materials:
The materials used include polymethylpentene (TPX), SiO2, and monolayer graphene. The equipment involves a setup for measuring reflectance and sensitivity.
4：Experimental Procedures and Operational Workflow:
The procedure includes setting up the composite structure, measuring the reflectance under different conditions, and analyzing the sensitivity to changes in the refractive index of the sensing medium.
5：Data Analysis Methods:
The analysis involves calculating the sensitivity and figure of merit (FOM) based on the reflectance data and the change in the refractive index of the sensing medium.
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