中国物理B ›› 2020, Vol. 29 ›› Issue (6): 64215-064215.doi: 10.1088/1674-1056/ab8899

• ELECTROMAGNETISM, OPTICS, ACOUSTICS, HEAT TRANSFER, CLASSICAL MECHANICS, AND FLUID DYNAMICS • 上一篇    下一篇

Extra-narrowband metallic filters with an ultrathin single-layer metallic grating

Ran Wang(王然), Qi-Huang Gong(龚旗煌), Jian-Jun Chen(陈建军)   

  1. 1 State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China;
    2 Microelectronics Instruments and Equipments R&D Center, Institude of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China;
    3 Nano-optoelectronics Frontier Center of Ministry of Education(NFC-MOE)&Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China;
    4 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • 收稿日期:2020-03-08 修回日期:2020-04-07 出版日期:2020-06-05 发布日期:2020-06-05
  • 通讯作者: Jian-Jun Chen E-mail:jjchern@pku.edu.cn
  • 基金资助:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0704401, 2017YFF0206103, and 2016YFA0203500), the National Natural Science Foundation of China (Grant Nos. 61922002, 91850103, 11674014, 61475005, 11527901, 11525414, and 91850111), and the Beijing Natural Science Foundation, China (Grant No. Z180015).

Extra-narrowband metallic filters with an ultrathin single-layer metallic grating

Ran Wang(王然)1,2, Qi-Huang Gong(龚旗煌)1,3,4, Jian-Jun Chen(陈建军)1,3,4   

  1. 1 State Key Laboratory for Mesoscopic Physics, School of Physics, Peking University, Beijing 100871, China;
    2 Microelectronics Instruments and Equipments R&D Center, Institude of Microelectronics of Chinese Academy of Sciences, Beijing 100029, China;
    3 Nano-optoelectronics Frontier Center of Ministry of Education(NFC-MOE)&Collaborative Innovation Center of Quantum Matter, Peking University, Beijing 100871, China;
    4 Collaborative Innovation Center of Extreme Optics, Shanxi University, Taiyuan 030006, China
  • Received:2020-03-08 Revised:2020-04-07 Online:2020-06-05 Published:2020-06-05
  • Contact: Jian-Jun Chen E-mail:jjchern@pku.edu.cn
  • Supported by:
    Project supported by the National Key Research and Development Program of China (Grant Nos. 2018YFA0704401, 2017YFF0206103, and 2016YFA0203500), the National Natural Science Foundation of China (Grant Nos. 61922002, 91850103, 11674014, 61475005, 11527901, 11525414, and 91850111), and the Beijing Natural Science Foundation, China (Grant No. Z180015).

摘要: Narrowband and high-transmission optical filters are extensively used in color display technology, optical information processing, and high-sensitive sensing. Because of large ohmic losses in metallic nanostructures, metallic filters usually exhibit low transmittances and broad bandwidths. By employing both strong field enhancements in metallic nano-slits and the Wood's anomaly in a periodic metallic grating, an extra-narrowband and high-transmission metallic filter is numerically predicted in an ultrathin single-layer metallic grating. Simulation results show that the Wood's anomaly in the ultrathin (thickness H=60 nm) single-layer metallic grating results in large field enhancements in the substrate and low losses in the metallic grating. As a result, the transmission bandwidth (transmittance T > 60%) at λ=1200 nm is as small as ΔλFWHM=1.6 nm, which is smaller than 4% of that in the previous thin dielectric and metallic filters. The corresponding quality factor is as high as Q=λλFWHM=750, which is 40 times greater than that in the previous reports. Moreover, the thickness of our metallic filter (H=60 nm) is smaller than 40% of that in the previous reports, and its maximum transmittance can reach up to 80%. In experiments, a narrowband metallic filter with a bandwidth of about ΔλFWHM=10 nm, which is smaller than 25% of that in the previous metallic filters, is demonstrated.

关键词: metallic filter, extra-narrowband, field enhancement, Wood', s anomaly

Abstract: Narrowband and high-transmission optical filters are extensively used in color display technology, optical information processing, and high-sensitive sensing. Because of large ohmic losses in metallic nanostructures, metallic filters usually exhibit low transmittances and broad bandwidths. By employing both strong field enhancements in metallic nano-slits and the Wood's anomaly in a periodic metallic grating, an extra-narrowband and high-transmission metallic filter is numerically predicted in an ultrathin single-layer metallic grating. Simulation results show that the Wood's anomaly in the ultrathin (thickness H=60 nm) single-layer metallic grating results in large field enhancements in the substrate and low losses in the metallic grating. As a result, the transmission bandwidth (transmittance T > 60%) at λ=1200 nm is as small as ΔλFWHM=1.6 nm, which is smaller than 4% of that in the previous thin dielectric and metallic filters. The corresponding quality factor is as high as Q=λλFWHM=750, which is 40 times greater than that in the previous reports. Moreover, the thickness of our metallic filter (H=60 nm) is smaller than 40% of that in the previous reports, and its maximum transmittance can reach up to 80%. In experiments, a narrowband metallic filter with a bandwidth of about ΔλFWHM=10 nm, which is smaller than 25% of that in the previous metallic filters, is demonstrated.

Key words: metallic filter, extra-narrowband, field enhancement, Wood', s anomaly

中图分类号:  (Filters, zone plates, and polarizers)

  • 42.79.Ci
42.79.Dj (Gratings) 78.67.Pt (Multilayers; superlattices; photonic structures; metamaterials) 81.05.Xj (Metamaterials for chiral, bianisotropic and other complex media)