Enhancement of Molecular Coherent Anti-Stokes Raman Scattering with Silicon Nanoantennas.
Enhancement of Molecular Coherent Anti-Stokes Raman Scattering with Silicon Nanoantennas.
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DOI：
10.1021/acs.nanolett.2c02040
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发表时间：
2022-05
期刊：
影响因子：
10.8
通讯作者：
Shamsul Abedin;Yong Li;A. Sifat;Khokan Roy;E. Potma
中科院分区：
文献类型：
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作者：
Shamsul Abedin;Yong Li;A. Sifat;Khokan Roy;E. Potma
表面增强相干反斯托克斯拉曼散射(SE-CARS)利用金属纳米结构上的表面等离子体共振来放大目标分子的相干拉曼响应。虽然这些金属天线在SE-CARS研究中取得了巨大的成功，但在超快激发下光诱导的纳米天线的形态变化在稳定性和重复性方面引入了显著的障碍。需要克服这些障碍，以便将SE-CARS建立为快速生物分子检测的可靠工具。在这里，我们通过执行分子CARS测量来解决这一挑战，该测量由具有更好的热性能的高指数介电粒子制成的纳米天线来增强。我们提出了在硅纳米天线上观察到的增强的分子CARS信号的第一个实验演示，与它们的金属对应的相比，它提供了更好的热稳定性。
Surface-enhanced coherent anti-Stokes Raman scattering (SE-CARS) takes advantage of surface plasmon resonances supported on metallic nanostructures to amplify the coherent Raman response of target molecules. While these metallic antennas have found significant success in SE-CARS studies, photoinduced morphological changes to the nanoantenna under ultrafast excitation introduce significant hurdles in terms of stability and reproducilibty. These hurdles need to be overcome in order to establish SE-CARS as a reliable tool for rapid biomolecular sensing. Here, we address this challenge by performing molecular CARS measurements enhanced by nanoantennas made from high-index dielectric particles with more favorable thermal properties. We present the first experimental demonstration of enhanced molecular CARS signals observed at Si nanoantennas, which offer much improved thermal stability compared to their metallic counterparts.