VIS-NIR TMOKE enhanced dielectric-metal hybrid structure for high performance dual-channel sensing.
Opt Express
; 31(22): 35880-35891, 2023 Oct 23.
Article
em En
| MEDLINE
| ID: mdl-38017750
ABSTRACT
Magneto-plasmon sensors based on the transverse magneto-optical Kerr effect (TMOKE) have been extensively studied in recent years. In this paper, we theoretically propose a hybrid structure composed of a one-dimensional bismuth iron garnet yttrium iron garnet (BIG YIG) nanowire arrays and thin film stack, which is grown on an infinite thick silicon wafer. The thin film stack, from top to bottom, consists of the following layers BIG YIG, SiO2, and Au. By exciting the magnetic dipole resonance mode between the cylindrical nanowires and the SPP mode on the surface of the Au film, dual-channel sensing has been achieved in both visible and infrared spectra. The results demonstrate that the TMOKE response spectrum of the structure supports ultra-narrow linewidths of 0.03â
nm in the visible light range and 1.54â
nm in the infrared range. By changing the refractive index of the analyte, the detected sensitivity of the sensor system in visible and infrared bands is 553â
nm RIU-1 and 285â
nm RIU-1, and the Figure of merit (FOM) can reach up to 69125 RIU-1 and 303 RIU-1, respectively. This work provides a theoretical basis and a feasible approach for the design of dual channel gas sensors.
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MEDLINE
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En
Ano de publicação:
2023
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Article