纳米空间分辨超快光谱和成像系统 “空间和时间的结合”— 纳米分辨和飞秒别的光谱超快光谱技术拥有诸多特色,例如高的时间分辨率,丰富的光与物质的非性相互作用,可以用光子相干地调控物质的量子态,其衍生和嫁接技术带来许多凝聚态物理实验技术的变革等等。然而,受制于激发波长的限制(可见-近红外),超快光谱在空间分辨上受到了一定的制约,在对一些微纳尺寸结构的材料研究中,诸如一维半导体纳米线,二维拓扑材料、纳米相变材料等,无法地进行有效的超快光谱分析。 德国Neaspec公司利用十数年在近场及纳米红外领域的技术积累,开发出了全新的纳米空间分辨超快光谱和成像系统,其pump激发光可兼容可见到近红外的多组激光器,probe探测光可选红外(650-2200 cm-1)或太赫兹(0.5-2 T)波段,实现了在超高空间分辨(20 nm)和超高时间分辨(50 fs)上对被测物质的同时表征。技术原理:设备特点和参数:→ 超高空间分辨和时间分辨同时实现;→ 20-50 nm空间分辨率;→ 根据pump光源时间分辨可达50 fs;→ probe光谱可选红外(650-2200 cm-1)或太赫兹(0.5-2 T)应用领域:→ 二维材料→ 半导体→ 纳米线/纳米颗粒→ 等离激元→ 高分子/生物材料→ 矿物质......应用案例:■ 纳米红外超快光谱分辨率为10nm的InAs纳米线红外成像,并结合时间分辨超快光谱分析载流子衰减层的形成过程参考:M. Eisele et al., Ultrafast multi-terahertz nano-spectroscopy with sub-cycle temporal resolution, Nature Phot. (2014) 8, 841.稳态开关灵敏性:容易发生相变的区域,光诱导散射响应较大参考:M. A. Huber et al., Ultrafast mid-infrared nanoscopy of strained vanadium dioxide nanobeams, Nano Lett. 2016, 16, 1421.参考:G. X. Ni et al., Ultrafast optical switching of infrared plasmon polaritons in high-mobility graphene, Nature Phot. (2016) 10, 244.参考:Mrejen et al., Ultrafast nonlocal collective dynamics of Kane plasmon-polaritons in a narrow- gap semiconductor, Sci. Adv. (2019), 5, 9618.■ 范德华材料 WSe2 中的超快研究参考:Mrejen et al., Transient exciton-polariton dynamics in WSe2 by ultrafast near-field imaging, Sci. Adv. (2019), 5, 9618.■ 黑磷中的近红外超快激发黑磷的high-contrast interband性质使其具有半导体性质,在光诱导重组过程中表面激发的电子空隙对(electron-hole pairs)~50fs并在5ps内消失参考:M. A. Huber et al.,Femtosecond photo-switching of interface polaritons in black phosphorus heterostructures, Nat. Nanotechnology. (2016), 5, 9618.■ 多层石墨烯中等离子效应衰减效应参考:M. Wagner et al., Ultrafast and Nanoscale Plasmonic Phenomena in Exfoliated Graphene Revealed by Infrared Pump?Probe Nanoscopy, Nano Lett. 2014, 14, 894.发表文章:neaspec中国用户发表文章超80篇,其中36篇影响因子10。部分文章列表:● M. B. Lundeberg et al., Science 2017 AOP.● F. J. Alfaro-Mozaz et al., Nat. Commun. 2017, 8, 15624.● P. Alonso-Gonzales et al., Nat. Nanotechnol. 2017, 12, 31.● M. A. Huber et al., Nat. Nanotechnol. 2017, 12, 207.● P. Li et al., Nano Lett. 2017, 17, 228.● T. Low et al., Nat. Mater. 2017, 16, 182.● D. Basov et al., Nat. Nanotechnol. 2017, 12, 187.● M. B. Lundberg et al., Nat. Mater. 2017, 16, 204.● D. Basov et al., Science 2016, 354, 1992.● Z. Fei et al., Nano Lett. 2016, 16, 7842.● A. Y. Nikitin et al., Nat. Photonics 2016, 10, 239.● G. X. Ni et al., Nat. Photonics 2016, 10, 244.● A. Woessner et al., Nat. Commun. 2016, 7, 10783.● Z. Fei et al., Nano Lett. 2015, 15, 8271.● G. X. Ni et al., Nat. Mater. 2015, 14, 1217.● E. Yoxall et al., Nat. Photonics 2015, 9, 674.● Z. Fei et al., Nano Lett. 2015, 15, 4973.● M. D. Goldflam et al., Nano Lett. 2015, 15, 4859.● P. Li et al., Nat. Commun. 2015, 5, 7507.● S. Dai et al., Nat. Nanotechnol. 2015, 10, 682.● S. Dai et al., Nat. Commun. 2015, 6, 6963.● A. Woessner et al., Nat. Mater. 2014, 14, 421.● P. Alonso-González et al.,Science 2014, 344, 1369.● S. Dai et al., Science 2014, 343, 1125.● P. Li et al., Nano Lett. 2014, 14, 4400.● A. Y. Nikitin et al., Nano Lett. 2014, 14, 2896.● M. Wagner et al., Nano Lett. 2014, 14, 894.● M. Schnell et al., Nat. Commun. 2013, 5, 3499.● J. Chen et al., Nano Lett. 2013, 13, 6210.● Z. Fei et al., Nat. Nanotechnol. 2012, 8, 821.● J. Chen et al., Nature 2012, 487, 77.● Z. Fei et al., Nature 2012, 487, 82.
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