Aalizadeh Majid, Serebryannikov Andriy E, Khavasi Amin, Vandenbosch Guy A E, Ozbay Ekmel
Department of Electrical and Electronics Engineering, Bilkent University, Ankara, 06800, Turkey.
Nanotechnology Research Center (NANOTAM), Bilkent University, Ankara, 06800, Turkey.
Sci Rep. 2018 Jul 27;8(1):11316. doi: 10.1038/s41598-018-29544-x.
The possibility of real-time tuning of optical devices has attracted a lot of interest over the last decade. At the same time, coming up with simple lithography-free structures has always been a challenge in the design of large-area compatible devices. In this work, we present the concept and the sample design of an electrically tunable, lithography-free, ultra-thin transmission-mode color filter, the spectrum of which continuously covers the whole visible region. A simple Metal-Insulator-Metal (MIM) cavity configuration is used. It is shown that using the electro-optic dielectric material of 4-dimethyl-amino-N-methyl-4-stilbazoliumtosylate (DAST) as the dielectric layer in this configuration enables efficient electrical tuning of the color filter. The total thickness of the structure is 120 nm, so it is ultra-thin. The output color gets tuned from violet to red by sweeping the applied voltage from -12 to +12 Volts (V). We present an in-detail optimization procedure along with a simple calculation method for the resonance wavelength of the MIM cavity that is based on circuit theory. Such power-efficient structures have a large variety of potential applications ranging from optical communication and switching to displays and color-tunable windows.
在过去十年中，光学器件实时调谐的可能性引起了广泛关注。与此同时，在设计大面积兼容器件时，想出简单的无光刻结构一直是一项挑战。在这项工作中，我们提出了一种电可调、无光刻、超薄透射模式彩色滤光片的概念和样品设计，其光谱连续覆盖整个可见光区域。采用了简单的金属-绝缘体-金属（MIM）腔结构。结果表明，在这种结构中使用4-二甲基氨基-N-甲基-4-甲苯磺酸盐（DAST）的电光介电材料作为介电层，可以实现彩色滤光片的高效电调谐。该结构的总厚度为120nm，因此是超薄的。通过将施加电压从-12伏（V）扫描到+12伏，输出颜色从紫色调谐到红色。我们提出了一个详细的优化程序以及一种基于电路理论的MIM腔共振波长的简单计算方法。这种节能结构具有从光通信和开关到显示器和颜色可调窗口等多种潜在应用。
