Realizing Vibrant and High-Contrast Reflective Structural Colors from Lossy Metals Supporting Dielectric Gratings

Youngji Kim, Kyungmin Jung, Jiung Cho, Jerome K. Hyun

Research output: Contribution to journalArticlepeer-review

16 Scopus citations

Abstract

Despite their distinctive chemical properties, lossy metals are generally avoided in the design of structural colors because the optical losses can degrade the color vibrancy. Herein, we demonstrate a strategy that allows lossy metals supporting near-wavelength dielectric gratings to achieve high color vibrancy by benefiting from the optical loss rather than suffering from it. By exciting the grating rotated 45° relative to the incident field, s-polarized (s-pol) and p-polarized (p-pol) light each excites a spectrally distinct resonance, described by a treatment of coupled waveguide-array modes, that retards the phase over the wavelength. Owing to the birefringence, a cross-polarized reflection spectrum displays two sharp peaks from each component that decreases the monochromaticity. We show that lossy metals can minimize the p-pol contribution, leaving the sharp s-pol response to determine the spectrum and generate high color vibrancy. Through this scheme, we demonstrate that lossy metal substrates including Pt, a catalytically active metal, and W, a CMOS-compatible metal, can achieve larger sRGB gamut coverage ratios of 90% and 69%, respectively, than that of 55% from Ag, while maintaining similar pixel contrast ratios to that of Ag.

Original languageEnglish
Pages (from-to)10717-10726
Number of pages10
JournalACS Nano
Volume13
Issue number9
DOIs
StatePublished - 24 Sep 2019

Bibliographical note

Funding Information:
This research was supported by the National Research Foundation of Korea (NRF) grant funded by the Ministry of Science, ICT & Future Planning (MSIT) (No. NRF-2017R1A5A1015365 and No. 2019R1C1C1002802), the Technology Development Program to Solve Climate Changes of the NRF (NRF-2016M1A2A2940914), and the Nano•Material Technology Development Program (2009-0082580). The authors would also like to thank the Korean Basic Science Institute (KBSI) at the Western Seoul Center for the DC sputter depositions.

Publisher Copyright:
© 2019 American Chemical Society.

Keywords

  • coupled waveguide-array modes
  • lossy metals
  • near-wavelength grating
  • structural colors
  • vibrant colors

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