Sreekanth Kandammathe Valiyaveedu, Medwal Rohit, Srivastava Yogesh Kumar, Manjappa Manukumara, Rawat Rajdeep Singh, Singh Ranjan
Division of Physics and Applied Physics, School of Physical and Mathematical Sciences, Nanyang Technological University, 21 Nanyang Link, Singapore 637371.
Centre for Disruptive Photonic Technologies, The Photonic Institute, Nanyang Technological University, 50 Nanyang Avenue, Singapore 639798.
Nano Lett. 2021 Dec 8;21(23):10070-10075. doi: 10.1021/acs.nanolett.1c03817. Epub 2021 Nov 21.
Thin film optical coatings have a wide range of industrial applications from displays and lighting to photovoltaic cells. The realization of electrically tunable thin film optical coatings in the visible wavelength range is particularly important to develop energy efficient and dynamic color filters. Here, we experimentally demonstrate dynamic color generation using electrically tunable thin film optical coatings that consist of two different phase change materials (PCMs). The proposed active thin film nanocavity excites the Fano resonance that results from the coupling of a broadband and a narrowband absorber made up of phase change materials. The Fano resonance is then electrically tuned by structural phase switching of PCM layers to demonstrate active color filters covering the entire visible spectrum. In contrast to existing thin film optical coatings, the developed electrically tunable PCM based Fano resonant thin optical coatings have several advantages in tunable displays and active nanophotonic applications.
薄膜光学涂层在从显示器、照明到光伏电池等广泛的工业应用中都有应用。在可见波长范围内实现电可调薄膜光学涂层对于开发节能和动态滤色器尤为重要。在此，我们通过实验证明了使用由两种不同相变材料（PCM）组成的电可调薄膜光学涂层来产生动态颜色。所提出的有源薄膜纳米腔激发了由相变材料构成的宽带和窄带吸收体耦合产生的法诺共振。然后通过PCM层的结构相变对法诺共振进行电调谐，以展示覆盖整个可见光谱的有源滤色器。与现有的薄膜光学涂层相比，所开发的基于电可调PCM的法诺共振薄光学涂层在可调显示器和有源纳米光子应用中具有多个优点。
