Abstract:We theoretically propose a simple plasmonic structure with network-type metasurface consisting of double-layer metal-dielectric network-type metasurface on the two-layer dielectric films. Multiple reflection bands with minimum full width at half maximum of 3 nm are achieved in the visible and near-infrared regions due to the excitation and hybridized coupling of localized surface plasmons, photonic mode, and optical cavity mode. The plasmonic structure with network-type metasurface also shows highly tunable re… Show more
“…The reflectivity dip is the minimum value when the refractive index of the dielectric layer is approximately 1.3. At the same time, the FWHM is around 1.85 nm, which is much narrower than that of the published narrowband absorber in the visible region [24, 28, 34, 39]. Fig.…”
Section: Resultsmentioning
confidence: 70%
“…Thus, the FOM can reach 233.5. As far as we know, the FOM is much higher than that of the previously published plasmonic refractive index sensor in visible region [24, 28, 34, 39]. The proposed plasmonic refractive index sensor shows good linearity, as shown in Fig.…”
Section: Resultsmentioning
confidence: 77%
“…Its sensitivity is around 425 nm/RIU and the FOM can reach 233.5. This is much better than that of the previously reported sensor in visible region [24, 28, 34, 39]. For its high sensing performance, the metamaterial structure may be found applications in the biological binding, integrated photodetectors, chemical applications, and so on.…”
Section: Discussionmentioning
confidence: 86%
“…For example, in the biological field, a higher FOM of refractive index sensor means a stronger performance in molecule detection. The FOM of the sensor in this work can reach 233.5, which is far higher than that of the published plasmonic refractive index sensor in the visible region [24, 28, 34]. The plasmonic sensor is based on the metal-dielectric-metal (MDM) periodic structure.…”
We propose and numerically investigate a perfect ultra-narrowband absorber with an absorption bandwidth of only 1.82 nm and an absorption efficiency exceeding 95% in the visible region. We demonstrate that the perfect ultra-narrowband absorption is ascribed to the coupling effect induced by localized surface plasmon resonance. The influence of structural dimensions on the optical performance is also investigated, and the optimal structure is obtained with the extremely low reflectivity (0.001) of the resonance dip. The perfect absorber can be operated as a refractive index sensor with a sensitivity of around 425 nm/RIU and the figure of merit (FOM) reaching 233.5, which greatly improves the accuracy of the plasmonic sensors in visible region. Moreover, the corresponding figure of merit (FOM*) for this sensor is also calculated to describe the performance of the intensity change detection at a fixed frequency, which can be up to 1.4 × 105. Due to the high sensing performance, the metamaterial structure has great potential in the biological binding, integrated photodetectors, chemical applications and so on.
“…The reflectivity dip is the minimum value when the refractive index of the dielectric layer is approximately 1.3. At the same time, the FWHM is around 1.85 nm, which is much narrower than that of the published narrowband absorber in the visible region [24, 28, 34, 39]. Fig.…”
Section: Resultsmentioning
confidence: 70%
“…Thus, the FOM can reach 233.5. As far as we know, the FOM is much higher than that of the previously published plasmonic refractive index sensor in visible region [24, 28, 34, 39]. The proposed plasmonic refractive index sensor shows good linearity, as shown in Fig.…”
Section: Resultsmentioning
confidence: 77%
“…Its sensitivity is around 425 nm/RIU and the FOM can reach 233.5. This is much better than that of the previously reported sensor in visible region [24, 28, 34, 39]. For its high sensing performance, the metamaterial structure may be found applications in the biological binding, integrated photodetectors, chemical applications, and so on.…”
Section: Discussionmentioning
confidence: 86%
“…For example, in the biological field, a higher FOM of refractive index sensor means a stronger performance in molecule detection. The FOM of the sensor in this work can reach 233.5, which is far higher than that of the published plasmonic refractive index sensor in the visible region [24, 28, 34]. The plasmonic sensor is based on the metal-dielectric-metal (MDM) periodic structure.…”
We propose and numerically investigate a perfect ultra-narrowband absorber with an absorption bandwidth of only 1.82 nm and an absorption efficiency exceeding 95% in the visible region. We demonstrate that the perfect ultra-narrowband absorption is ascribed to the coupling effect induced by localized surface plasmon resonance. The influence of structural dimensions on the optical performance is also investigated, and the optimal structure is obtained with the extremely low reflectivity (0.001) of the resonance dip. The perfect absorber can be operated as a refractive index sensor with a sensitivity of around 425 nm/RIU and the figure of merit (FOM) reaching 233.5, which greatly improves the accuracy of the plasmonic sensors in visible region. Moreover, the corresponding figure of merit (FOM*) for this sensor is also calculated to describe the performance of the intensity change detection at a fixed frequency, which can be up to 1.4 × 105. Due to the high sensing performance, the metamaterial structure has great potential in the biological binding, integrated photodetectors, chemical applications and so on.
“…This sensor has a wavelength sensitivity exceeding 1000 nm/RIU and FOM of only 5 [25]. Liu et al demonstrated theoretically a plasmonic sensor based on the plasmonic structure with network-type metasurface on the two-layer dielectric films, which have the FOM of 68.57 [26]. Using Au bowtie nanoantenna arrays with metal-insulator-metal configuration, Lin simulated numerically a sensor with the FOM of 254 [27].…”
A perfect ultra-narrow band infrared metamaterial absorber based on the all-metal-grating structure is proposed. The absorber presents a perfect absorption efficiency of over 98% with an ultra-narrow bandwidth of 0.66 nm at normal incidence. This high efficient absorption is contributed to the surface plasmon resonance. Moreover, the surface plasmon resonance-induced strong surface electric field enhancement is favorable for application in biosensing system. When operated as a plasmonic refractive index sensor, the ultra-narrow band absorber has a wavelength sensitivity 2400 nm/RIU and an ultra-high figure of merit 3640, which are much better than those of most reported similar plasmonic sensors. Besides, we also comprehensively investigate the influences of structural parameters on the sensing properties. Due to the simplicity of its geometry structure and its easiness to be fabricated, the proposed high figure of merit and sensitivity sensor indicates a competitive candidate for applications in sensing or detecting fields.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
