Abstract

An ultrathin angle-insensitive color filter enabling high color saturation and a wide color gamut is proposed by relying on a 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 with an effective complex refractive index, which can be tuned by altering the thickness of MgH₂ to obtain the targeted value of the imaginary part, corresponding to the realization of high color saturation. It is verified that the proposed color filter offers highly enhanced color saturation in conjunction with a wide color gamut by introducing a few-nanometer thick MgH₂ layer. As the MgH₂-a-Si:H layer retains the advantages of high refractive index and tiny thickness, the proposed color filter exhibits large angular tolerance up to ±60°. In addition, MgH₂ with an unstable property can interconvert with Mg under a dehydrogenation/hydrogenation reaction, which empowers the proposed color filter with dynamically tunable output color. The proposed scheme shows great promise in color printing and ultracompact display devices with high color saturation, wide gamut, large angular tolerance, and dynamic tunability.

© 2023 Chinese Laser Press

Tunable reflective color filters based on asymmetric Fabry–Perot cavities employing ultrathin Ge₂Sb₂Te₅ as a broadband absorber

Feng Liu, Huimin Shi, Xupeng Zhu, Peng Dai, Zihao Lin, Yuxiang Long, Zhong Xie, Yanming Zhou, and Huigao Duan
Appl. Opt. 57(30) 9040-9045 (2018)

Color filters based on a nanoporous Al-AAO resonator featuring structure tolerant color saturation

Wenjing Yue, Yang Li, Cong Wang, Zhao Yao, Sang-Shin Lee, and Nam-Young Kim
Opt. Express 23(21) 27474-27483 (2015)

All-dielectric thin films based on single silicon materials for angle-insensitive structural colors

Kun Feng, Qingyuan Li, Jintong Liu, Yusi Wang, Nan Chen, Yankai Li, and Yikun Bu
Opt. Lett. 46(20) 5161-5164 (2021)

Angle-tolerant polarization-tuned color filter exploiting a nanostructured cavity

Wenjing Yue, Sang-Shin Lee, and Eun-Soo Kim
Opt. Express 24(15) 17115-17124 (2016)

Investigation of angle-insensitive grating color filters at periods much smaller than the wavelength of incidence

Hao Liu and Guoguo Kang
Appl. Opt. 62(28) 7536-7543 (2023)