A sensor based on an infrared dual-band polarization-insensitive metamaterial absorber is proposed,which consists of a square ring layer at the top,a silicon dielectric layer at the bottom,and a metal layer at the bot...A sensor based on an infrared dual-band polarization-insensitive metamaterial absorber is proposed,which consists of a square ring layer at the top,a silicon dielectric layer at the bottom,and a metal layer at the bottom.By using the finite element method(FEM),for the transverse electricity(TE)and transverse magnetic(TM)mode incidence,the absorption rates of the resonant point at 4.75μm are 0.950 and 0.943,and the absorption rates at 7.85μm can reach 0.997 and 0.998,respectively.Because of the symmetry of the structure,the absorber is not sensitive to polarization when it is vertically incident and can still maintain good absorption performance in a wide range of incidence angles.For commonly used aqueous solutions(sodium chloride,glucose,sucrose,etc.),the refractive index of the aqueous solution is in the range of 1.33 to 1.48 and the sensing test is performed.For the TE mode,the sensing sensitivity is about 2283.05 nm/RIU through linear fitting,and the quality factor Q is 108.38.For the TM mode,the sensing sensitivity is about 2371.43 nm/RIU through linear fitting,and the quality factor Q is 84.50,which has better sensing characteristics.The absorber sensor designed in this paper achieves high sensitivity in the infrared,has a high Q value,is easy to manufacture,and plays a huge advantage in the field of high-sensitivity detection.展开更多
The modulation of thermal radiation in the infrared region is a highly anticipated method to achieve infrared sensing and camouflage. Here, a multiband metamaterial emitter based on the Al∕SiO_(2)∕Al nanosandwich st...The modulation of thermal radiation in the infrared region is a highly anticipated method to achieve infrared sensing and camouflage. Here, a multiband metamaterial emitter based on the Al∕SiO_(2)∕Al nanosandwich structure is proposed to provide new ideas for effective infrared and laser-compatible camouflage. By virtue of the intrinsic absorption and magnetic resonance property of lossy materials, the thermal radiation in the infrared region can be rationally modulated. The fabricated samples generally present low emissivity(ε_(3–5μm)= 0.21,ε_(8–14μm)= 0.19) in the atmospheric windows to evade infrared detection as well as high emissivity(ε_(5–8μm)= 0.43) in the undetected band for energy dissipation. Additionally, the laser camouflage is also realized by introducing a strong absorption at 10.6 μm through the nonlocalized plasmon resonance of the SiO_(2)layer.Moreover, the fabricated emitter shows promising prospects in thermal management due to the good radiative cooling property that is comparable to the metallic Al material. This work demonstrates a multiband emitter based on the metasurface structure with compatible infrared-laser camouflage as well as radiative cooling properties, which is expected to pave new routes for the design of thermal radiation devices.展开更多
基金supported by the National Natural Science Foundation of China(Grant Nos.62075057 and 62075058).
文摘A sensor based on an infrared dual-band polarization-insensitive metamaterial absorber is proposed,which consists of a square ring layer at the top,a silicon dielectric layer at the bottom,and a metal layer at the bottom.By using the finite element method(FEM),for the transverse electricity(TE)and transverse magnetic(TM)mode incidence,the absorption rates of the resonant point at 4.75μm are 0.950 and 0.943,and the absorption rates at 7.85μm can reach 0.997 and 0.998,respectively.Because of the symmetry of the structure,the absorber is not sensitive to polarization when it is vertically incident and can still maintain good absorption performance in a wide range of incidence angles.For commonly used aqueous solutions(sodium chloride,glucose,sucrose,etc.),the refractive index of the aqueous solution is in the range of 1.33 to 1.48 and the sensing test is performed.For the TE mode,the sensing sensitivity is about 2283.05 nm/RIU through linear fitting,and the quality factor Q is 108.38.For the TM mode,the sensing sensitivity is about 2371.43 nm/RIU through linear fitting,and the quality factor Q is 84.50,which has better sensing characteristics.The absorber sensor designed in this paper achieves high sensitivity in the infrared,has a high Q value,is easy to manufacture,and plays a huge advantage in the field of high-sensitivity detection.
基金National Natural Science Foundation of China(62075058,62105096,U1804261)Innovation Scientists and Technicians Troop Construction Projects of Henan Province(22400051007)+2 种基金Natural Science Foundation of Henan Province(222300420011)Outstanding Youth Foundation of Henan Normal University(2020JQ02)Program for Innovative Research Team(in Science and Technology)in University of Henan Province(23IRTSTHN013)
文摘The modulation of thermal radiation in the infrared region is a highly anticipated method to achieve infrared sensing and camouflage. Here, a multiband metamaterial emitter based on the Al∕SiO_(2)∕Al nanosandwich structure is proposed to provide new ideas for effective infrared and laser-compatible camouflage. By virtue of the intrinsic absorption and magnetic resonance property of lossy materials, the thermal radiation in the infrared region can be rationally modulated. The fabricated samples generally present low emissivity(ε_(3–5μm)= 0.21,ε_(8–14μm)= 0.19) in the atmospheric windows to evade infrared detection as well as high emissivity(ε_(5–8μm)= 0.43) in the undetected band for energy dissipation. Additionally, the laser camouflage is also realized by introducing a strong absorption at 10.6 μm through the nonlocalized plasmon resonance of the SiO_(2)layer.Moreover, the fabricated emitter shows promising prospects in thermal management due to the good radiative cooling property that is comparable to the metallic Al material. This work demonstrates a multiband emitter based on the metasurface structure with compatible infrared-laser camouflage as well as radiative cooling properties, which is expected to pave new routes for the design of thermal radiation devices.
