In order to improve sensing performance of surface plasmon resonance（SPR）sensor

the influence of chemical potential on sensing characteristics of a graphene-based SPR sensor is studied by transmission matrix method.Research results show that detecting sensitivity of the sensor changes with the variation of chemical potential when the structure parameters of the device are fixed.The influence of the structure parameters of the sensor on the performance of the device is related to the value of the chemical potential.Based on this relevance

the structural parameters of the SPR sensor are re-selected

and the sensitivity of the device is improved by about 20.4 %.The research results provide a reference for the optimal design of similar graphene-based SPR sensors.