Low-cost surface plasmon resonance refractive index sensor based on the metal grating in DVD-ROM disc

In this paper, a low-cost surface plasmon resonance refractive index sensor based on DVD-ROM is introduced. There is a special grating structure in DVD-ROM, which can be used to excite SPR effect. We have measured the optimal resonance angle of the grating with deionized water at 28 degrees. Wavelength modulation and angle modulation are used to detect different concentrations of sodium chloride solution. The results show that the sensitivities of the two modulation methods are 540 nm/RIU and 32.4 degree/RIU, respectively. Furthermore, we use finite difference time domain method to simulate the two methods separately. The sensitivities are 514 nm/RIU and 30.8 degree/RIU, respectively. The simulation results are in good agreement with the experimental results. Using this method to prepare the detection substrate can greatly reduce the production cost of SPR sensors. (C) 2021 Elsevier B.V. All rights reserved.

Automated summary

This paper introduces a low-cost surface plasmon resonance sensor based on DVD-ROM, which is used to detect different concentrations of solutions through wavelength modulation and angle modulation. Both simulation and experimental results show good agreement in sensitivity between the two methods.