摘要
Metamaterial absorber/emitter is an important aspect of infrared radiation manipulation.In this paper,we proposed four simple switchable infrared metamaterial absorbers/emitters with Ag/VO_(2)disks on the Ag plane employing triangle,square,hexagon,and circle unit cells.The spectral absorption peaks whose intensities are above 0.99 occur at~4μm after structure optimization when VO_(2)is in insulating state and disappear when VO_(2)becomes metallic state.The simulated electromagnetic field reveals that the spectral absorption peaks are attributed to the excitation of magnetic polariton within the insulating VO_(2)spacer layer,whose values exceed 1.59 orders of magnitude higher than the incident magnetic field.Longer resonant wavelength would be excited in square arrays because its configuration is a better carrier of charges at the same spans.For absorption stability,the absorbers/emitters with square and circular structures do not have any change with the polarization angles changing from 0°to 90°,due to the high rotational symmetric structure.And four absorbers/emitters reveal similar shifts and attenuations under different incident angles.We believed that the switchable absorber/emitter demonstrates promising applications in the sensing technology and adaptive infrared system.
出处
《Research》
SCIE
EI
CAS
CSCD
2021年第1期994-1001,共8页
研究（英文）
基金
the National Natural Science Foundation of China(51902073)
National Key Research&Development Program(2016YFB0303903,2016YFE0201600)
Foundation of Equip-ment Development Department(6140922010901)
China Postdoctoral Science Foundation Funded Project(2019M661273,2020T130142)
Heilongjiang Province Post-doctoral Science Foundation(LBH-Z19159)
the Funda-mental Research Funds for the Central Universities(HIT.NSRIF.2020019).
