Ultrafast infrared plasmonics advances vibrational spectroscopy
Ultrafast infrared plasmonics advances vibrational spectroscopy
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超快红外等离子体激元推进振动光谱学
DOI：
10.11470/photo.220204
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发表时间：
2022
期刊：
影响因子：
--
通讯作者：
S. Ashihara
中科院分区：
文献类型：
--
作者：
I. Morichika;S. Ashihara
在中红外（中IR）范围内的吸收和散射代表物质的振动光谱。振动光谱，或物质的指纹，提供了分子水平上的微观结构信息。如今，任何人都可以使用商用傅里叶变换红外光谱仪（FT-IR）轻松测量振动光谱，振动光谱已成为材料和生命科学中不可或缺的仪器分析方法之一。自20世纪90年代发现克尔透镜锁模以来，超短激光技术在振动光谱方面取得了巨大进展。特别是，超快光谱学已经能够在飞秒时间尺度上对化学反应过程进行时间分辨的观察，并极大地有助于阐明反应机制1）。此外，超短激光的特性还被用于通过二维红外光谱2）进行高阶结构分析，以及通过双梳光谱3）进行高分辨率和短时间测量。超短激光的宽带、短脉冲和高强度特性不仅对振动光谱学有用，而且对化学反应的振动控制也有用。用中红外脉冲对分子振动的强激发有望选择性地诱导振动模式参与的化学反应。这种方法被称为“键选择性化学”，作为在分子水平上控制化学反应的最终方法之一，它有很大的希望。
Absorption and scattering in the mid-infrared (mid-IR) range represent the vibrational spectrum of matter. The vibrational spectrum, or the fingerprint of matter, provides information on its microscopic structure at the molecular level. Nowadays, anyone can easily measure vibrational spectra using a commercially available Fourier transform infrared spectrometer (FT-IR), and vibrational spectroscopy has become one of the indispensable methods for instrumental analysis in materials and life sciences.Since the discovery of Kerr-lens mode-locking in the 1990s, ultrashort laser technology has made great progress in vibrational spectroscopy. In particular, ultrafast spectroscopy has enabled time-resolved observation of chemical reaction processes on femtosecond time scales and greatly contributed to elucidation of reaction mechanisms 1). In addition, the characteristics of ultrashort lasers are being utilized to higherorder structural analysis via two-dimensional infrared spectroscopy 2), and high-resolution and short-time measurement via dual-comb spectroscopy 3). The broadband, short-pulsed, and high-intensity properties of ultrashort lasers are useful not only for vibrational spectroscopy, but also for vibrational control of chemical reactions. Strong excitation of molecular vibration with mid-IR pulses is expected to selectively induce chemical reactions in which the vibrational mode participates. This approach, called “bond-selective chemistry,” holds great promise as one of the ultimate methods of controlling chemical reactions at the molecular level 4).