Integrated nanoscale photonic devices have wide applications ranging from optical interconnects and optical computing to optical communications. Wavelength demultiplexer is an essential on-chip optical component which can separate the incident wavelength into different channels; however, the experimental progress is very limited. Here, using a multi-component nano-cavity design, we realize an ultracompact, broadband and high-contrast wavelength demultiplexer, with 2.3 μm feature size, 200 nm operation bandwidth (from 780 nm to 980 nm) and a contrast ratio up to 13.7 dB. The physical mechanism is based on the strong modulation of the surface plasmon polaritons induced by the multi-component nano-cavities, and it can be generalized to other nanoscale photonic devices. This provides a strategy for constructing on-chip photon routers, and also has applications for chip-integrated optical filter and optical logic gates.
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机译：集成的纳米级光子器件具有广泛的应用，范围从光学互连，光学计算到光学通信。波长解复用器是必不可少的片上光学组件，可以将入射波长分为不同的通道。但是，实验进展非常有限。在这里，我们使用多组分纳米腔设计，实现了超紧凑，宽带和高对比度的波长解复用器，其特征尺寸为2.3μm，操作带宽为200μnm（从780nm至980nm），对比度高达13.7。 D b。物理机理是基于多组分纳米腔所诱导的表面等离激元极化子的强调制，并且可以推广到其他纳米级光子器件。这提供了构建片上光子路由器的策略，并且还具有芯片集成的光学滤波器和光学逻辑门的应用。
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