Recently, the subject on ＂plasmonics＂ has received significant attention in designing surface plasmon resonance （SPR） sensors. In order to achieve extremely high-sensitivity sensing, multilayered configurations ba...Recently, the subject on ＂plasmonics＂ has received significant attention in designing surface plasmon resonance （SPR） sensors. In order to achieve extremely high-sensitivity sensing, multilayered configurations based on a variety of active materials and dielectrics have been exploited. In this work, a novel SPR sensor is proposed and investigated theoretically. The structure, analyzed in attenuated total reflection （ATR）, consists of multilayer interfaces between gold and a metamaterial （LHM） separated by an analyte layer as a sensing medium. By interchanging between gold and LHM, under the effect of the refractive index （RI） of analyte set to be in the range of 1.00 to 1.99, the sharp peak reflectivity at the SPR angle takes two opposite behaviors predicted from the transfer matrix method. At the threshold value of 1.568 of the refractive index of analyte and when the LHM is the outer medium, the layered structure exhibits a giant sharp peak located at 43° of intensity up to 105 due to the Goos-Hanchen effect. With respect to the refractive index （RI） change and thickness of analyte, the characteristics （intensity, resonance condition, and quality factor） of the SPR mode, which make the proposed device have the potential for biosensing applications, have been analytically modelized.展开更多
The purpose of this work is to investigate theoretically the characteristics of confined electromagnetic modes propagating along the interfaces of a multilayer device.This one dimensional(1D)sensor is formed by stacki...The purpose of this work is to investigate theoretically the characteristics of confined electromagnetic modes propagating along the interfaces of a multilayer device.This one dimensional(1D)sensor is formed by stacking a left-handed material(LHM)layer between a SiO2-glass prism and a dielectric gap layer in contact with gold(Au).The results indicate that the total thickness of the LHM layer and dielectric gap,in optimum conditions,give the ability of tuning significantly the characteristics of the resonant modes correlated to surface plasmons(SPs)propagation along the interfaces of the designed device.By considering two arrangements between LHM and Au,two opposite resonant behaviors observed in p-reflectance spectra are analyzed in the angular interrogation mode and discussed thoroughly.展开更多
文摘Recently, the subject on ＂plasmonics＂ has received significant attention in designing surface plasmon resonance （SPR） sensors. In order to achieve extremely high-sensitivity sensing, multilayered configurations based on a variety of active materials and dielectrics have been exploited. In this work, a novel SPR sensor is proposed and investigated theoretically. The structure, analyzed in attenuated total reflection （ATR）, consists of multilayer interfaces between gold and a metamaterial （LHM） separated by an analyte layer as a sensing medium. By interchanging between gold and LHM, under the effect of the refractive index （RI） of analyte set to be in the range of 1.00 to 1.99, the sharp peak reflectivity at the SPR angle takes two opposite behaviors predicted from the transfer matrix method. At the threshold value of 1.568 of the refractive index of analyte and when the LHM is the outer medium, the layered structure exhibits a giant sharp peak located at 43° of intensity up to 105 due to the Goos-Hanchen effect. With respect to the refractive index （RI） change and thickness of analyte, the characteristics （intensity, resonance condition, and quality factor） of the SPR mode, which make the proposed device have the potential for biosensing applications, have been analytically modelized.
文摘The purpose of this work is to investigate theoretically the characteristics of confined electromagnetic modes propagating along the interfaces of a multilayer device.This one dimensional(1D)sensor is formed by stacking a left-handed material(LHM)layer between a SiO2-glass prism and a dielectric gap layer in contact with gold(Au).The results indicate that the total thickness of the LHM layer and dielectric gap,in optimum conditions,give the ability of tuning significantly the characteristics of the resonant modes correlated to surface plasmons(SPs)propagation along the interfaces of the designed device.By considering two arrangements between LHM and Au,two opposite resonant behaviors observed in p-reflectance spectra are analyzed in the angular interrogation mode and discussed thoroughly.
