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Wide-Angle Near-Perfect Absorber Based on Sub-Wavelength Dielectric Grating Covered by Continuous Thin Aluminum Film

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Abstract

We design and numerically investigate an optical absorber consisting of the sub-wavelength dielectric grating covered by continuous thin aluminum film. In this absorber, the aluminum film act as an efficient absorbing material because of the enhanced electric field in the air nano-grooves, and the absorption spect+rum can be manipulated by Fabry-Perot cavity mode resonance. According to the spectrum manipulation mechanism, the wavelength of absorption peak can be tuned by changing the heights and widths of the air nano-grooves. More importantly, the high absorption is very robust to the incident angle around the designed wavelength. From the nanofabrication point of view, the light absorber can be fabricated more easily without the need for ion or electrochemical etching of metal and it is easy to be integrated into complex photonic devices.

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Acknowledgments

This work was supported by the key Natural Science Foundation of the Higher Education Institutions of Jiangsu Province (grant 14KJB140014, 14KJA510006), by the National Natural Science Foundation of China (NFSC) Major Research Program on Nanomanufacturing (grant No. 91323303), by the NFSC (grant No. 61505134, 61575133, 91023044), the Natural Science Foundation of Jiangsu Province (grant No. BK20140357, BK20140348), the Science and technology project of Suzhou (grant No. ZXG201427, ZXG2013040), the project funded by Soochow University (grant No. SDY2012A18), and the project funded by the Priority Academic Program Development of Jiangsu Higher Education Institutions (PAPD).

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Authors and Affiliations

  1. College of Physics, Optoelectronics and Energy & Collaborative Innovation Center of Suzhou Nano Science and Technology, Soochow University, Suzhou, 215006, China

    Minghui Luo, Su Shen, Yan Ye, Yanhua Liu, Yun Zhou & Linsen Chen

  2. Key Lab of Advanced Optical Manufacturing Technologies of Jiangsu Province & Key Lab of Modern Optical Technologies of Education Ministry of China, Soochow University, Suzhou, 215006, China

    Minghui Luo, Su Shen, Yan Ye, Yanhua Liu, Yun Zhou & Linsen Chen

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  1. Minghui Luo
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  2. Su Shen
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  3. Yan Ye
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  4. Yanhua Liu
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  5. Yun Zhou
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  6. Linsen Chen
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Correspondence to Yun Zhou or Linsen Chen.

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Luo, M., Shen, S., Ye, Y. et al. Wide-Angle Near-Perfect Absorber Based on Sub-Wavelength Dielectric Grating Covered by Continuous Thin Aluminum Film. Plasmonics 12, 339–343 (2017). https://doi.org/10.1007/s11468-016-0269-3

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  • DOI: https://doi.org/10.1007/s11468-016-0269-3

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