Wide range bilayer aluminum nanowire grating sensors with robust reflective peaks

Zhicheng Ye; Jun Zheng

doi:10.3788/COL202018.052401

Chinese Optics Letters, Volume. 18, Issue 5, 052401(2020)

Wide range bilayer aluminum nanowire grating sensors with robust reflective peaks

Zhicheng Ye^1、* and Jun Zheng²

Author Affiliations

¹Department of Electronic Engineering, Shanghai Jiao Tong University, Shanghai 200240, China

²Key Laboratory for Laser Plasmas (Ministry of Education), Department of Physics and Astronomy, and Collaborative Innovation Center of IFSA (CICIFSA), Shanghai Jiao Tong University, Shanghai 200240, China

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Figures & Tables(4)

$(a) Schematic diagram of the bilayer metallic nanowire grating. (b) The theoretical SPR wavelength λSPR changing with ambient refractive index nA and incident angle θ. (c) AFM image of the fabricated grating structure.$

Fig. 1. (a) Schematic diagram of the bilayer metallic nanowire grating. (b) The theoretical SPR wavelength $λ_{SPR}$ changing with ambient refractive index $n_{A}$ and incident angle $θ$ . (c) AFM image of the fabricated grating structure.

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Fig. 2. Simulated reflective spectra of the grating in ambient conditions. (a1) Reflected spectra changing with incident angle $θ$ . (a2) The magnetic field $H_{y}$ of the resonant peak for $λ = 452 nm$ and $θ = 30 °$ . (b1), (b2) Simulated reflected spectra changing with duty ratio $f$ with $θ = 30 °$ for bilayer and unilayer Al gratings. (c1), (c2) Reflected spectra changing with PR thickness $h_{1}$ and Al thickness $h_{2}$ with incident angle $θ = 30 °$ for bilayer Al grating. Other parameters are the same as that in Fig. 1.

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$Simulated reflective spectra under different ambient refractive indices nA. The dashed line is the theoretical λSPR changing with nA. Other structure parameters are the same as that in Fig. 1.$

Fig. 3. Simulated reflective spectra under different ambient refractive indices $n_{A}$ . The dashed line is the theoretical $λ_{SPR}$ changing with $n_{A}$ . Other structure parameters are the same as that in Fig. 1.

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$(a) Snapshot of the measurement setup and the reflected photos with θ=50° of white light in ambient air, deionized water, and 80% sucrose solution, respectively. (b1)–(b3) Measured reflective spectra with ambient air, deionized water, and 80% sucrose solution, respectively. The black dashed lines are the calculated λSPR by Eq. (4). (c) Refractive index nA calculated by Eq. (4). The horizontal lines are the average values.$

Fig. 4. (a) Snapshot of the measurement setup and the reflected photos with $θ = 50 °$ of white light in ambient air, deionized water, and 80% sucrose solution, respectively. (b1)–(b3) Measured reflective spectra with ambient air, deionized water, and 80% sucrose solution, respectively. The black dashed lines are the calculated $λ_{SPR}$ by Eq. (4). (c) Refractive index $n_{A}$ calculated by Eq. (4). The horizontal lines are the average values.