High color saturation and angle-insensitive ultrathin color filter based on effective medium theory  

作　　者：李欣婷 李阳 李超 高嵩 岳文静 Xinting Li;Yang Li;Chao Li;Song Gao;Wenjing Yue(School of Information Science and Engineering,University of Jinan,Jinan 250022,China;Shandong Provincial Key Laboratory of Network Based Intelligent Computing,University of Jinan,Jinan 250022,China)

机构地区：[1]School of Information Science and Engineering,University of Jinan,Jinan 250022,China [2]Shandong Provincial Key Laboratory of Network Based Intelligent Computing,University of Jinan,Jinan 250022,China

出　　处：《Chinese Optics Letters》2023年第3期146-151,共6页中国光学快报（英文版）

基　　金：supported by the Natural Science Foundation of Shandong Province(No.ZR2019BF013);the National Natural Science Foundation of China(Nos.62005095 and 61905091)。

摘　　要：An ultrathin angle-insensitive color filter enabling high color saturation and a wide color gamut is proposed by relying on magnesium hydride-hydrogenated amorphous silicon[MgH2-a-Si:H]lossy dielectric layer.Based on effective medium theory,the MgH2-a-Si:H layer with an ultrathin thickness can be equivalent to a quasi-homogeneous dielectric layer wit an effective complex refractive index,which can be tuned by altering the thickness of MgH2to obtain the targeted value o the imaginary part,corresponding to the realization of high color saturation.It is verified that the proposed color filte offers highly enhanced color saturation in conjunction with a wide color gamut by introducing a few-nanometer thic MgH2layer.As the MgH2-a-Si:H layer retains the advantages of high refractive index and tiny thickness,the proposed colo filter exhibits large angular tolerance up to±60°.In addition,MgH2with an unstable property can interconvert with Mg unde a dehydrogenation/hydrogenation reaction,which empowers the proposed color filter with dynamically tunable outpu color.The proposed scheme shows great promise in color printing and ultracompact display devices with high color sat uration,wide gamut,large angular tolerance,and dynamic tunability.

关 键 词：color filter effective medium theory lossy dielectric layer color saturation angle insensitivity 

分 类 号：TP391.41[自动化与计算机技术—计算机应用技术]