Yong-ping LI, Jun-xian LIU, Yu-feng YUAN. Aluminum-graphene Structure Based on Phase Modulation Employed for Biosensing[J]. Acta Photonica Sinica, 2020, 49(7): 724002
- Acta Photonica Sinica
- Vol. 49, Issue 7, 724002 (2020)
Fig. 1. Schematic diagram of Al⁃Graphene SPR sensor
Fig. 2. The simulation curves of different metal films
Fig. 3. The simulation curves of different Al film thicknesses with the number of graphene layers (The excitation wavelength is 632.8 nm and the sensing layer refractive index is 1.333)
Fig. 4. Variation of electric field strength of 29 nm Al and 29 nm Al /5⁃layer graphene structure that excites strong SPR resonance
Fig. 5. Phase change and reflection curves based on the optimal configuration (the excitation wavelength is 632.8 nm and the sensing layer refractive index is 1.333)
Fig. 6. Curves of difference phase and SPR angle shift with the number of graphene layers and the thickness of the aluminum film (the excitation wavelength is 632.8 nm and the sensing layer refractive index 1.333)
Fig. 7. Variation of differential phase with respect to sensing layer refractive index (the excitation wavelength is 632.8 nm)
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Table 1. Differential phase(Δφd) and phase sensitivity of different sensing configuration
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Table 2. Sensitivity of Al metal SPR sensor with different modulation modes
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