Common Metal-Dielectric-Metal Nanocavities for Multispectral Narrowband Light Absorption |
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| Authors: | Zhengqi Liu Guiqiang Liu Guolan Fu Shan Huang Shiwen Ren Zhengwang Wang Mulin Liu Xiaoshan Liu |
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| Institution: | 1.Jiangxi Key Laboratory of Nanomaterials and Sensors, Institute of Optoelectronic Materials and Technology, Provincial Key Laboratory of Optoelectronic and Telecommunication, College of Physics and Communication Electronics,Jiangxi Normal University,Nanchang,China |
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| Abstract: | We present a method to theoretically achieve multispectral narrowband light absorption in common metal-dielectric-metal nanocavities. Polarization-independent and wide-angle multi-band light absorption with absorbance up to 99 % is achieved owing to the excitation of multiple localized plasmon cavity modes. Strong interactions between plasmon resonances and photonic modes are further introduced for achieving sharp absorption spectrum with sub-10-nm bandwidth via a high-index dielectric spacer with a thickness exceeding λ/2. These findings can offer new perspectives for multispectral nano-optics devices including perfect light absorbers and subtractive polychromatic filters. |
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