Color Contrast of Single-Layer Graphene under White Light Illumination Induced by Broadband Photon Management
Color Contrast of Single-Layer Graphene under White Light Illumination Induced by Broadband Photon Management
复制标题
宽带光子管理引起的白光照明下单层石墨烯的颜色对比度
DOI：
10.1021/acsami.9b16149
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发表时间：
2019
影响因子：
9.5
通讯作者：
Liu, Jifeng
中科院分区：
文献类型：
--
作者：
Yu, Xiaobai;Fu, Sidan;Song, Yi;Wang, Haozhe;Wang, Xiaoxin;Kong, Jing;Liu, Jifeng
可视化和操纵单层石墨烯（SLG）和其他二维材料的光学对比度一直是一个有趣的话题，以了解原子厚度的基本光-物质相互作用。由于SLG的光学特性可以通过选通进行调节，因此SLG颜色对比度的演示和操纵在柔性彩色显示中也具有重要的应用前景。然而，以前的SLG的光学对比度的演示大多限于单色照明下使用干涉效应的反射强度对比度。SLG中报道的光谱对比度大多是窄带或谐振波长，并且它需要精确的厚度控制和/或纳米光刻，这对于显示应用来说很难扩展到足够大的面积。在本文中，我们展示了新的颜色对比度光学可见度的SLG在白色光下使用宽带光子管理诱导纳米针结构的SnOx（x≤ 1）透明导电氧化物（TCO），这是可扩展到大面积彩色显示。低温制备的、自组装的、纳米针结构的SnOx（x≤ 1）薄膜有助于通过增强电磁场和增加SnOx/SLG界面处的散射效率来显著增加SLG中的宽带光吸收。使用纳米针结构的SnOx，在熔凝石英（SiO2）衬底上的SLG中的光学吸收在λ = 560-990 nm（从黄色到近红外光谱区）处从1.4%急剧增加到>10%，导致与没有SLG的周围区域的清晰颜色对比。自组装的方法，而不是复杂和昂贵的纳米光刻，允许大面积的二维光子器件的宽带和高效的光子管理效果的可扩展的制造。因此，这种方法可以进一步扩展到颜色可调的TCO/电介质/SLG 2D光子器件，通过调整TCO和SLG层中的自由载流子浓度/费米能级，通过门控-一个垫脚石，朝着灵活的彩色显示技术，利用2D材料和纳米结构薄膜。
Visualizing and manipulating the optical contrast of single-layer graphene (SLG) and other 2D materials has continuously been an interesting topic to understand fundamental light–matter interaction down to atomic thickness. Because the optical properties of SLG can be tuned by gating, demonstrating and manipulating the color contrast of SLG also has significant potential applications in ultrathin flexible color display. However, previous demonstrations of optical contrast of SLG are mostly limited to reflection intensity contrast under monochromatic illumination using the interference effect. The reported spectral contrast in SLG has mostly been narrow-band or at resonant wavelengths, and it required precise thickness control and/or nanolithography that are hardly scalable to large enough area for display applications. In this paper, we demonstrate novel color contrast optical visibility of SLG under white light using broadband photon management induced by nanoneedle-structured SnOx(x≤ 1) transparent conductive oxides (TCOs), which is scalable to large-area color display. The low-temperature fabricated, self-assembled, nanoneedle-structured SnOx(x≤ 1) thin films help to significantly increase the broadband optical absorption in SLG by enhancing the electromagnetic field and increasing the scattering efficiency at the SnOx/SLG interface. With nanoneedle-structured SnOx, the optical absorption in SLG on a fused quartz (SiO2) substrate is drastically increased from ∼1.4 to >10% at λ = 560–990 nm (from yellow to near infrared spectral regimes), leading to a clear color contrast to the surrounding region without SLG. The self-assembly approach, rather than sophisticated and costly nanolithography, allows scalable fabrication of large area 2D photonic devices with a broadband and highly efficient photon management effect. Therefore, this approach can be further extended to color-tunable TCO/dielectric/SLG 2D photonic devices by adjusting the free carrier concentrations/Fermi levels in the TCO and SLG layers via gating—a stepping stone toward ultrathin flexible color display technologies utilizing 2D materials and nanostructured thin films.