Acquisition of Time-Resolved Near-Field Optical Spectrometer for Semiconductor Nanostructure Research

购买用于半导体纳米结构研究的时间分辨近场光谱仪

• 批准号: 9503853
• 负责人: Howard Jackson
• 金额: $ 5万
• 依托单位: University of Cincinnati Main Campus
• 依托单位国家: 美国
• 项目类别: Standard Grant
• 财政年份: 1995
• 资助国家: 美国
• 起止时间: 1995-08-15 至 1997-01-31
• 项目状态: 已结题
• 来源: https://www.nsf.gov/awardsearch/showAward?AWD_ID=9503853&HistoricalAwards=false
• 关键词: Acquisition; Time; Resolved; Near; Field

9503853 Jackson This award is for partial support of a time-resolved near-field optical spectrometer (TRNFOS) to be used fop .semiconductor nanostructure research. By combining two commercially available instruments, we can configure a spectrometer that achieves both ultrafast (100 fs) time-resolution and spatial-resolution ( 500 A) more than an order of magnitude better than previously achievable using the best far field optics. The unique combination of capabilities of the instrument will allow us to consider experiments that previously were not possible. In particular, this instrument will allow for the first time: (A) Optical observation of spatially local potential fluctuations no longer masked by the inhomegeneously broadened photoluminescence lines (following Hess et al.) (B) The study of exciton dynamics in confinement to, and scattering from, these spatially local potential fluctuations. (C) The study of exciton dynamics in quantum wires and dots. Namely spatially resolved capture of excitons to wires and dots, as well as spatial transport of excitons along wires. %%% The principal aspects of the proposed research are the study of III-V and II-VI nanostructures. In the III-V multiple quantum wells the availability of the TRNFOS instrument will provide a spatial resolution that will allow optical observation of exciton confinement to lower dimensions through both "intrinsic" local potential fluctuations, as well as "extrinsic" potentials fabricated through focused ion beam mixing. For the case of focused ion beam mixing, the instrument will be capable of providing in a unique manner the lateral potential profile created by compositional intermixing. This understanding is an essential step in creating quantum wire and quantum dot structures. For quantum wire-like structures the TRNFOS instrument will provide local information on exciton lifetimes and exciton anisotropic diffusion to contrast with our p resent far field results. Similarly, in II-VI diluted magnetic heterostructures this instrument will allow us to observe directly the affect of magnetic ion clustering and alloy fluctuations on exciton dynamics and the magnetization dynamics of the magnetic ion themselves. In particular, we are interested in the dynamics of exciton self-localization in the formation of lower dimensional exciton magnetic polarons, and in the affect of d-d superexchange on the magnetization dynamics of magnetic ion clusters. The acquisition of this time-resolved near-field optical spectrometer will significantly advance present NSF supported efforts as well as open new opportunities to explore semiconductor material science and physics. The understanding of confined structures, quantum wires, quantum dots, and arrays will be strongly influenced by the acquisition of this instrument. ***

小行星9503853 该奖项是对用于半导体纳米结构研究的时间分辨近场光谱仪（TRNFOS）的部分支持。 通过结合两个商用仪器，我们可以配置一个光谱仪，实现超快（100 fs）的时间分辨率和空间分辨率（500 A）超过一个数量级比以前可实现的最佳远场光学。 该仪器独特的功能组合将使我们能够考虑以前不可能的实验。 特别是，该文书将首次允许： (A)空间局域势的光学观测 波动不再被不均匀 加宽的光致发光线（遵循Hess等人） (B)对束缚态激子动力学的研究 从这些空间局部势散射 波动 （丙） 量子线与量子点中激子动力学之研究。 即激子到导线的空间分辨捕获， 点，以及激子沿沿着线的空间输运。 拟议研究的主要方面是III-V和II-VI纳米结构的研究。 在III-V多量子威尔斯中，TRNFOS仪器的可用性将提供空间分辨率，这将允许通过“固有”局部势波动以及通过聚焦离子束混合制造的“非固有”势来光学观察激子限制到较低维度。 对于聚焦离子束混合的情况，仪器将能够以独特的方式提供由成分混合产生的横向电势分布。 这种理解是创造量子线和量子点结构的重要一步。 对于量子线结构，TRNFOS仪器将提供激子寿命和激子各向异性扩散的局部信息，以与我们目前的远场结果形成对比。 同样，在II-VI稀磁异质结构中，该仪器将使我们能够直接观察磁性离子簇和合金波动对激子动力学和磁性离子本身的磁化动力学的影响。 特别是，我们感兴趣的激子自局域化的动力学在低维激子磁极化子的形成，并在磁离子团簇的磁化动力学的d-d超交换的影响。 这款时间分辨近场光谱仪的获得将大大推进目前NSF支持的工作，并为探索半导体材料科学和物理学提供新的机会。 对受限结构、量子线、量子点和阵列的理解将受到该仪器的收购的强烈影响。 ***