Abstract
While plasmonic designs have dominated recent trends in structural color, schemes using localized surface plasmon resonances and surface plasmon polaritons that simultaneously achieve high color vibrancy at ultrahigh resolution have been elusive because of tradeoffs between size and performance. Herein we demonstrate vibrant and size-invariant transmissive type multicolor pixels composed of hybrid TiOx-Ag core-shell nanowires based on reduced scattering at their electric dipolar Mie resonances. This principle permits the hybrid nanoresonator to achieve the widest color gamut (~74% sRGB area coverage), linear color mixing, and the highest reported single color dots-per-inch (58,000~141,000) in transmission mode. Exploiting such features, we further show that an assembly of distinct nanoresonators can constitute a multicolor pixel for use in multispectral imaging, with a size that is ~10-folds below the Nyquist limit using a typical high NA objective lens.
Highlights
While plasmonic designs have dominated recent trends in structural color, schemes using localized surface plasmon resonances and surface plasmon polaritons that simultaneously achieve high color vibrancy at ultrahigh resolution have been elusive because of tradeoffs between size and performance
Filtering colors from micron and submicron pixels has already been demonstrated in transmissive[3,13,14,15,16] and reflective[17,18,19,20,21,22] designs. Many of these filters have relied on the use of surface plasmon polaritons (SPPs), which can be excited diffractively in metallic gratings, or the use of localized surface plasmons (LSPs) generated with metallic substructures
Exploiting the oxide-metal core-shell nanowire geometry, we show, in this work, one of the highest sRGB space coverages of ~74% corresponding to a wide gamut that includes high color vibrancy, and highest lateral resolution of 141,000 DPI reported for transmissive color pixels at a fixed polarization
Summary
While plasmonic designs have dominated recent trends in structural color, schemes using localized surface plasmon resonances and surface plasmon polaritons that simultaneously achieve high color vibrancy at ultrahigh resolution have been elusive because of tradeoffs between size and performance. We demonstrate vibrant and size-invariant transmissive type multicolor pixels composed of hybrid TiOx-Ag core-shell nanowires based on reduced scattering at their electric dipolar Mie resonances. This principle permits the hybrid nanoresonator to achieve the widest color gamut (~74% sRGB area coverage), linear color mixing, and the highest reported single color dots-per-inch (58,000~141,000) in transmission mode. LSP-based metal substructures including nanodisks above a metal film provide sub-diffraction-limited resolution but lack color vibrancy because plasmon damping at the metal interface attenuates the quality factor of the mode[17] Such structures can achieve ultrahigh resolutions exceeding 100,000 dots-per-inch (DPI), they operate in reflection mode[20,24], with applications aimed primarily toward displays or prints.
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