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Realizing Vibrant and High-Contrast Reflective Structural Colors from Lossy Metals Supporting Dielectric Gratings
- Title
- Realizing Vibrant and High-Contrast Reflective Structural Colors from Lossy Metals Supporting Dielectric Gratings
- Authors
- Kim, Youngji; Jung, Kyungmin; Cho, Jiung; Hyun, Jerome K.
- Ewha Authors
- 현가담
- SCOPUS Author ID
- 현가담
- Issue Date
- 2019
- Journal Title
- ACS NANO
- ISSN
- 1936-0851
1936-086X
- Citation
- ACS NANO vol. 13, no. 9, pp. 10717 - 10726
- Keywords
- structural colors; lossy metals; near-wavelength grating; vibrant colors; coupled waveguide-array modes
- Publisher
- AMER CHEMICAL SOC
- Indexed
- SCIE; SCOPUS
- Document Type
- Article
- 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 degrees 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.
- DOI
- 10.1021/acsnano.9b05382
- Appears in Collections:
- 자연과학대학 > 화학·나노과학전공 > Journal papers
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