Institute of Information Photonics Technology and College of Applied Sciences, Beijing University of Technology, Beijing 100124, P. R. China.
Nanoscale. 2019 Oct 3;11(38):17807-17814. doi: 10.1039/c9nr05648c.
We report an efficient ultrafast optical switching device consisting of periodically arranged gold nanowires, which were produced by the multistage deposition of colloidal gold nanoparticles into deep grooves, so that they are as high as 220 nm and continuous as long as 20 mm. Due to the large thickness of the gold nanowires, two resonance modes became efficient and mutually enhanced: the waveguide resonance mode and the Bragg microcavity resonance mode. These resonance modes are based on the same diffraction conditions and have a completely overlapped spectroscopic response. Thus, a sharp resonance mode with a large amplitude and a steep rising edge is observed in the optical extinction spectrum at normal incidence. Strong optical excitation induced a red shift of the resonance spectrum and resulted in an enhanced optical transmission spectrum with a narrow bandwidth and a high response speed. Such an optical switching device with new physics has potential applications in optical logic circuits and integrated optics.
我们报道了一种由周期性排列的金纳米线组成的高效超快速光开关器件，这些金纳米线是通过将胶体金纳米粒子多级沉积到深沟中制成的，其高度高达 220nm，长度长达 20mm。由于金纳米线的厚度较大，两种共振模式变得高效且相互增强：波导共振模式和布拉格微腔共振模式。这些共振模式基于相同的衍射条件，具有完全重叠的光谱响应。因此，在正入射时，光消光谱中观察到具有大振幅和陡峭上升沿的尖锐共振模式。强光学激发导致共振光谱红移，并导致具有窄带宽和高响应速度的增强光透射光谱。这种具有新物理特性的光学开关器件在光学逻辑电路和集成光学中有潜在的应用。
