Supercontinuum spatial modulation spectroscopy: Detection and noise limitations
Supercontinuum spatial modulation spectroscopy: Detection and noise limitations
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DOI：
10.1063/1.4829656
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发表时间：
2013-11-01
影响因子：
1.6
通讯作者：
Kuno, M.
中科院分区：
文献类型：
--
作者：
McDonald, M. P.;Vietmeyer, F.;Kuno, M.
超连续空间调制光谱是一种简便的工具，用于在可见光和近红外（420-1100 nm）范围内进行单分子/粒子消光光谱。该技术的性能以单个金纳米颗粒（NPs）作为标准进行基准测试，因为它们经过了充分的研究，并在可见光下显示出显著的等离子体共振。单个直径(d)为8 ~ 40 nm的Au NPs的消光光谱通过sigma（ext）近似于1 × 10(-13)-1 × 10(-11) cm(2)的消光截面（sigma(ext)）进行分辨。相应的信噪比范围从近似于30到近似于1400。该技术的检测限确定为4.3 x 10(-14) cm(2) （4.3 nm(2)）。为了展示超连续空间调制光谱更广泛的适用性，我们获得了其他模型系统的消光光谱，如单个单壁碳纳米管（SWCNTs）和CdSe纳米线。我们首次展示了单个（8,3）和（6,5）SWCNTs的消光光谱。对于两种手性，它们的E-11[(8,3))为1.30 eV (952nm)；（6,5） 1.26 eV （986 nm）和E-22 [(8,3) 1.86 eV (667 nm)]；（6,5） 2.19 eV (567 nm)]激子共振，相应的sigma（ext）截面类似于10(-13)cm(2) mu m（-1）。(C) 2013 AIP出版有限责任公司
Supercontinuum spatial modulation spectroscopy is a facile tool for conducting single molecule/particle extinction spectroscopy throughout the visible and near infrared (420-1100 nm). The technique's capabilities are benchmarked using individual Au nanoparticles (NPs) as a standard since they are well studied and display a prominent plasmon resonance in the visible. Extinction spectra of individual Au NPs with diameters (d) ranging from d similar to 8 to 40 nm are resolved with extinction cross sections (sigma(ext)) of sigma(ext) similar to 1 x 10(-13)-1 x 10(-11) cm(2). Corresponding signal-to-noise ratios range from similar to 30 to similar to 1400. The technique's limit of detection is determined to be 4.3 x 10(-14) cm(2) (4.3 nm(2)). To showcase supercontinuum spatial modulation spectroscopy's broader applicability, extinction spectra are acquired for other model systems, such as individual single-walled carbon nanotubes (SWCNTs) and CdSe nanowires. We show for the first time extinction spectra of individual (8,3) and (6,5) SWCNTs. For both chiralities, their E-11 [(8,3) 1.30 eV (952 nm); (6,5) 1.26 eV (986 nm)] and E-22 [(8,3) 1.86 eV (667 nm); (6,5) 2.19 eV (567 nm)] excitonic resonances are seen with corresponding cross sections of sigma(ext) similar to 10(-13) cm(2) mu m(-1). (C) 2013 AIP Publishing LLC.