实时检测 TiN 薄膜中的相干振动动态

IF 8 2区 材料科学 Q1 MATERIALS SCIENCE, MULTIDISCIPLINARY
Andrea Iudica, Silvia Rotta Loria, Cristina Mancarella, Luca Mascaretti, Alberto Naldoni, Giulio Cerullo, Andrea Li Bassi, Margherita Zavelani-Rossi
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引用次数: 0

摘要

氮化钛(TiN)因其显著的等离子特性和强大的电子-声子(e-phon)耦合,导致极快(100 fs)的电子-晶格冷却,最近引起了人们的极大兴趣。本文报告了在 TiN 薄膜中产生相干声子的情况,以及通过时间分辨率低于 15 fs 的宽带瞬态反射光谱对其进行实时检测的情况。测量结果显示了与激发态电子衰减叠加的阻尼振荡。发现了一种相干振动模式,其频率≈10 THz,归因于缺陷激活的正常模式,与自发拉曼散射数据一致,去相时间≈250 fs。在与带间光学跃迁(3.2 和 2.5 eV)相对应的光子能量处,还观察到两个 π 相翻转,这归因于振动模式与这些跃迁的选择性耦合。结果表明,相干声子的位移激发模型从时间行为和频谱振幅曲线的角度描述了相干响应。总之,该研究对迄今为止尚未探测到的 TiN 薄膜中的相干声子进行了全面而详细的分析,并提供了有关 TiN 光物理特性的相关信息,这些信息可能对其应用非常有用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。

Real-Time Detection of Coherent Vibrational Dynamics in TiN Films

Real-Time Detection of Coherent Vibrational Dynamics in TiN Films

Real-Time Detection of Coherent Vibrational Dynamics in TiN Films

Titanium nitride (TiN) has recently gained considerable interest because of its remarkable plasmonic properties and for its strong electron–phonon (e–ph) coupling, leading to extremely fast (<100 fs) electron-lattice cooling. Here, the generation of coherent phonons in TiN films is reported, along with their real-time detection by means of broadband transient reflection spectroscopy with sub-15-fs temporal resolution. The measurements show damped oscillations, superimposed to excited state electronic decay. A coherent vibrational mode is revealed, with ≈10 THz frequency ascribed to defect-activated normal modes, consistent with spontaneous Raman scattering data, and a dephasing time of ≈250 fs. Two π-phase flips are also observed located at photon energies corresponding to interband optical transitions (at 3.2 and 2.5 eV), ascribed to selective coupling of the vibrational mode to these transitions; the energy modulation induced by the vibrational coherence is evaluated. It is shown that the displacive excitation of coherent phonons model describes the coherent response in terms of temporal behavior and of spectral amplitude profile. Overall, a comprehensive and detailed analysis of coherent phonons in TiN films, so far undected, is provided and relevant information on TiN photo-physical properties, potentially useful for its applications, is given.

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来源期刊
Advanced Optical Materials
Advanced Optical Materials MATERIALS SCIENCE, MULTIDISCIPLINARY-OPTICS
CiteScore
13.70
自引率
6.70%
发文量
883
审稿时长
1.5 months
期刊介绍: Advanced Optical Materials, part of the esteemed Advanced portfolio, is a unique materials science journal concentrating on all facets of light-matter interactions. For over a decade, it has been the preferred optical materials journal for significant discoveries in photonics, plasmonics, metamaterials, and more. The Advanced portfolio from Wiley is a collection of globally respected, high-impact journals that disseminate the best science from established and emerging researchers, aiding them in fulfilling their mission and amplifying the reach of their scientific discoveries.
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