Optoelectronics Research Centre and Centre for Photonic Metamaterials, University of Southampton, Southampton, SO17 1BJ, UK.
Centre for Disruptive Photonic Technologies and The Photonics Institute, School of Physical and Mathematical Sciences, Nanyang Technological University, Singapore, 637371, Singapore.
Adv Mater. 2018 Apr;30(14):e1707354. doi: 10.1002/adma.201707354. Epub 2018 Feb 27.
Diamond is introduced as a material platform for visible/near-infrared photonic metamaterials, with a nanostructured polycrystalline diamond metasurface only 170 nm thick providing an experimental demonstration of coherent light-by-light modulation at few-optical-cycle (6 fs) pulse durations. "Coherent control" of absorption in planar (subwavelength-thickness) materials has emerged recently as a mechanism for high-contrast all-optical gating, with a speed of response that is limited only by the spectral width of the absorption line. It is shown here that a free-standing diamond membrane structured by focused ion beam milling can provide strong, spectrally near-flat absorption over a visible to near-infrared wavelength range that is wide enough (wider than is characteristically achievable in plasmonic metal metasurfaces) to facilitate coherent modulation of ultrashort optical pulses comprising only a few oscillations of electromagnetic field.
钻石被引入可见光/近红外光子超材料的材料平台，具有 170nm 厚的纳米结构多晶金刚石亚表面，在几光学周期（6fs）脉冲持续时间内提供相干光-光调制的实验演示。在平面（亚波长厚度）材料中吸收的“相干控制”最近作为高对比度全光门控的一种机制出现，其响应速度仅受吸收线的光谱宽度限制。这里表明，通过聚焦离子束铣削构造的独立金刚石膜可以提供在可见到近红外波长范围内的强、光谱近平坦吸收，该波长范围足够宽（比等离子体金属超表面通常能够实现的宽），可以促进仅包含几个电磁场振荡的超短光脉冲的相干调制。
