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首页> 外文学位 >Excimer laser induced electrical conductivity in polyimide: Applications to engineering, physics, and applied science.
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Excimer laser induced electrical conductivity in polyimide: Applications to engineering, physics, and applied science.

机译：准分子激光在聚酰亚胺中诱导的电导率：在工程，物理和应用科学中的应用。

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摘要

Various aspects of the interaction of excimer laser pulses and polyimide were investigated, focusing on low fluences where laser induced electrical conductivity is observed.;Multiple shot excimer ablation of polyimide was investigated, and at fluences between 20 mJ/cm;The optical properties of the laser irradiated surface were also studied with regard to a transient decrease in reflectivity that is observed during and in the first few tens of nanoseconds after irradiation. Pump probe experiments using electronically delayed probe pulses were performed and measurements of reflectivity, transmissivity and scattering were made under identical conditions. The results, a decrease in reflectivity and scattering with a simultaneous increase in transmissivity, imply a transient refractive index phenomenon during the first 150 ns after excimer irradiation.;A nonlinear current-voltage relation was observed near the critical point of the laser induced metal-insulator transition. The crossover behavior from nonlinear to linear regimes was studied in detail and interpreted in terms of a percolation theory of binary conductor-insulator mixtures. The nonlinearity and the crossover can, for the first time, be described simultaneously in terms of a new theory of space charge limited currents on percolation clusters.
机译：研究了受激准分子激光脉冲与聚酰亚胺相互作用的各个方面，重点是观察到激光诱导的电导率的低注量;研究了聚酰亚胺的多次发射受激准分子烧蚀，以及在20 mJ / cm的注量之间;还研究了激光照射表面的反射率的瞬时下降，该下降是在辐射期间和之后的几十纳秒内观察到的。使用电子延迟探针脉冲进行泵探针实验，并在相同条件下测量反射率，透射率和散射。结果是，反射率的降低和散射的同时透射率的增加，意味着在准分子辐射后的最初150 ns内出现了瞬态折射率现象。;在激光诱导金属的临界点附近观察到非线性电流-电压关系，绝缘子过渡。详细研究了从非线性状态到线性状态的交叉行为，并根据二元导体-绝缘体混合物的渗流理论进行了解释。非线性和交叉可以首次根据渗流簇上的空间电荷限制电流的新理论同时描述。

著录项

  • 作者

    Ball, Zane Andrew.;

  • 作者单位

    Rice University.;

  • 授予单位 Rice University.;
  • 学科 Engineering Electronics and Electrical.;Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 1996
  • 页码 186 p.
  • 总页数 186
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类
  • 关键词

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