Photonics Research, 2020, 8 (11): 11001742, Published Online: Oct. 28, 2020
All-metallic metasurfaces towards high-performance magneto-plasmonic sensing devices 
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Fig. 1. Schematic drawing of the magneto-plasmonic sensor based on nanodisk arrays. The device’s geometrical parameters include diameter D t 1 t 2 P y − z x
Fig. 2. Optical and MO responses of the proposed nanostructure. (a) Reflection spectra for the sample with different direction of magnetization. The FWHM of these two reflection curves is 7.748 nm. For clarity of the shift in the reflected light, the spectral range is zoomed in within a 4 nm wavelength window in the inset. (b) Corresponding TMOKE spectrum calculated by Eq. (1 ). The FWHM is 0.125 nm. (c) FEM simulated reflection spectra of the demagnetized sample as a function of incident angle and wavelength. The dashed lines indicate (1,0) and (− 1 , 0 k x − y y − z
Fig. 3. Influence of incident angle and period on optical responses for the magneto-plasmonic system. (a) Reflection spectra as a function of incident angle while the period P = 400 nm θ = 50 ° 2 .
Fig. 4. Dependence of optical and MO responses on geometrical parameters. Reflection of the hybrid nanostructure where the Co layer is demagnetized as a function of (a) nanodisk diameter D t 1 = 20 nm t 2 = 13 nm D = 200 nm t 2 = 13 nm D = 200 nm t 1 = 20 nm
Fig. 5. Refractive index sensitivity of Au/Co nanodisk arrays on top of Au film. (a) TMOKE spectrum for different dielectric environments as a function of wavelength. The refractive indices are air n = 1 n = 1.33 n = 1.397 n = 1.4458
Fig. 6. Sensing-performance comparison of MO-SPR and SPR sensors. The red and green spheres represent the FOM for the sensors based on an array of Co-Au nanodisks and based an array of Au nanodisks, respectively, in media with same gradient refractive index (n = 1 4 ).
Lixia Li, Xueyang Zong, Yufang Liu. All-metallic metasurfaces towards high-performance magneto-plasmonic sensing devices[J]. Photonics Research, 2020, 8(11): 11001742.
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