Resonant laser printing of structural colors on high-index dielectric metasurfaces.
Resonant laser printing of structural colors on high-index dielectric metasurfaces.
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DOI：
10.1126/sciadv.1602487
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发表时间：
2017-05
期刊：
影响因子：
13.6
通讯作者：
Kristensen A
中科院分区：
文献类型：
--
作者：
Zhu X;Yan W;Levy U;Mortensen NA;Kristensen A
材料的颜色是精确的激光控制使用新的制造技术与纳米图案半导体表面。人造结构色，源于可见光和人造纳米结构之间的共振相互作用，正在成为无墨彩色印刷的一种解决方案。我们证明了由高折射率介电材料制成的纳米结构可以方便地产生非虹彩结构色。与等离子体类似物相比，具有高折射率介电体（如锗）的彩色表面具有较低的反射率，从而产生优越的颜色对比度。利用锗的带对带吸收特性，激光后处理了具有形态依赖共振的锗色超表面。脉冲激光辐照下的强非共振能量吸收使晶格温度在超短时间尺度（1ns）内局部升高（超过1200k）。这形成了共振激光打印的基础，其中快速熔化允许表面能量驱动的形态变化以及相关的颜色外观修改。激光可打印的高折射率介质彩色超表面具有大面积可扩展性，为不褪色、色彩鲜艳的印刷和装饰开辟了新的范例。
Colors of materials are precisely laser-controlled using new manufacturing technology with nanopatterned semiconductor surfaces. Man-made structural colors, which originate from resonant interactions between visible light and manufactured nanostructures, are emerging as a solution for ink-free color printing. We show that non-iridescent structural colors can be conveniently produced by nanostructures made from high-index dielectric materials. Compared to plasmonic analogs, color surfaces with high-index dielectrics, such as germanium (Ge), have a lower reflectance, yielding a superior color contrast. Taking advantage of band-to-band absorption in Ge, we laser-postprocess Ge color metasurfaces with morphology-dependent resonances. Strong on-resonance energy absorption under pulsed laser irradiation locally elevates the lattice temperature (exceeding 1200 K) in an ultrashort time scale (1 ns). This forms the basis for resonant laser printing, where rapid melting allows for surface energy–driven morphology changes with associated modification of color appearance. Laser-printable high-index dielectric color metasurfaces are scalable to a large area and open a new paradigm for printing and decoration with nonfading and vibrant colors.