Raj Shrestha Vivek, Lee Sang-Shin, Kim Eun-Soo, Choi Duk-Yong
Department of Electronic Engineering, Kwangwoon University, 20 Kwangwoon-ro, Nowon-Gu, Seoul 139-701, South Korea.
Laser Physics Centre, Research School of Physics and Engineering, Australian National University, ACT 2601, Australia.
Sci Rep. 2015 Jul 27;5:12450. doi: 10.1038/srep12450.
Nanostructured spectral filters enabling dynamic color-tuning are saliently attractive for implementing ultra-compact color displays and imaging devices. Realization of polarization-induced dynamic color-tuning via one-dimensional periodic nanostructures is highly challenging due to the absence of plasmonic resonances for transverse-electric polarization. Here we demonstrate highly efficient dynamic subtractive color filters incorporating a dielectric-loaded aluminum nanowire array, providing a continuum of customized color according to the incident polarization. Dynamic color filtering was realized relying on selective suppression in transmission spectra via plasmonic resonance at a metal-dielectric interface and guided-mode resonance for a metal-clad dielectric waveguide, each occurring at their characteristic wavelengths for transverse-magnetic and electric polarizations, respectively. A broad palette of colors, including cyan, magenta, and yellow, has been attained with high transmission beyond 80%, by tailoring the period of the nanowire array and the incident polarization. Thanks to low cost, high durability, and mass producibility of the aluminum adopted for the proposed devices, they are anticipated to be diversely applied to color displays, holographic imaging, information encoding, and anti-counterfeiting.
能够实现动态颜色调谐的纳米结构光谱滤光片对于实现超紧凑彩色显示器和成像设备极具吸引力。由于横向电偏振不存在等离子体共振，通过一维周期性纳米结构实现偏振诱导的动态颜色调谐极具挑战性。在此，我们展示了一种高效的动态减法滤色器，它包含一个加载电介质的铝纳米线阵列，可根据入射偏振提供连续的定制颜色。动态颜色过滤是通过金属 - 电介质界面处的等离子体共振和金属包覆电介质波导的导模共振在透射光谱中进行选择性抑制来实现的，这两种共振分别在横向磁偏振和横向电偏振的特征波长处发生。通过调整纳米线阵列的周期和入射偏振，已获得了包括青色、品红色和黄色在内的多种颜色，其透过率超过80%。由于所提出的器件采用的铝成本低、耐久性高且可大规模生产，预计它们将被广泛应用于彩色显示器、全息成像、信息编码和防伪等领域。
