Printing colour at the optical diffraction limit
Printing colour at the optical diffraction limit
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DOI：
10.1038/nnano.2012.128
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发表时间：
2012-09-01
影响因子：
38.3
通讯作者：
Yang, Joel K. W.
中科院分区：
文献类型：
--
作者：
Kumar, Karthik;Duan, Huigao;Yang, Joel K. W.
印刷彩色图像的最高分辨率取决于可见光的衍射极限。为了达到这一限制，需要间距为250 nm的单个颜色元素（或像素），转换成分辨率接近每英寸100，000点（d.p.i.）的打印图像。然而，用于分配多种着色剂或通过等离子体结构制造结构颜色的方法具有不足的分辨率和有限的可扩展性（1-6）。在这里，我们提出了一种非着色剂的方法，实现了明场彩色打印的分辨率高达光学衍射极限。颜色信息被编码在金属纳米结构的尺寸参数中，因此调整它们的等离子体共振决定了单个像素的颜色。我们的颜色映射策略产生具有急剧颜色变化和精细色调变化的图像，通过纳米压印光刻（7，8）进行大容量彩色印刷，并且可以用于制作用于安全的缩微图像，隐写术（9），纳米级光学滤波器（6，10 -12）和高密度光谱编码光学数据存储。
The highest possible resolution for printed colour images is determined by the diffraction limit of visible light. To achieve this limit, individual colour elements (or pixels) with a pitch of 250 nm are required, translating into printed images at a resolution of similar to 100,000 dots per inch (d.p.i.). However, methods for dispensing multiple colourants or fabricating structural colour through plasmonic structures have insufficient resolution and limited scalability(1-6). Here, we present a non-colourant method that achieves bright-field colour prints with resolutions up to the optical diffraction limit. Colour information is encoded in the dimensional parameters of metal nanostructures, so that tuning their plasmon resonance determines the colours of the individual pixels. Our colour-mapping strategy produces images with both sharp colour changes and fine tonal variations, is amenable to large-volume colour printing via nanoimprint lithography(7,8), and could be useful in making microimages for security, steganography(9), nanoscale optical filters(6,10-12) and high-density spectrally encoded optical data storage.