TY - JOUR
T1 - Realizing Vibrant and High-Contrast Reflective Structural Colors from Lossy Metals Supporting Dielectric Gratings
AU - Kim, Youngji
AU - Jung, Kyungmin
AU - Cho, Jiung
AU - Hyun, Jerome K.
N1 - 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.
PY - 2019/9/24
Y1 - 2019/9/24
N2 - 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.
AB - 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.
KW - coupled waveguide-array modes
KW - lossy metals
KW - near-wavelength grating
KW - structural colors
KW - vibrant colors
UR - http://www.scopus.com/inward/record.url?scp=85072636753&partnerID=8YFLogxK
U2 - 10.1021/acsnano.9b05382
DO - 10.1021/acsnano.9b05382
M3 - Article
C2 - 31465202
AN - SCOPUS:85072636753
SN - 1936-0851
VL - 13
SP - 10717
EP - 10726
JO - ACS Nano
JF - ACS Nano
IS - 9
ER -