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首页> 外文学位 >Multiphoton effects in the polydiacetylene poly bis(p-toluene sulfonate) of 2,4-dexadiyne-1,6-diol (PTS).
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Multiphoton effects in the polydiacetylene poly bis(p-toluene sulfonate) of 2,4-dexadiyne-1,6-diol (PTS).

机译：2,4-右二炔-1,6-二醇（PTS）的聚二乙炔聚双（对甲苯磺酸盐）中的多光子效应。

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摘要

π-conjugated polymers have been attracting interest in many research fields such as physics, chemistry and material sciences because of their high χ (3) nonlinearity due to the delocalization of π-electrons along the polymer backbone. The strong one dimensional confinement of the π-electrons causes the effect to be very large. This property of the material is of great interest for possible application in all-optical devices, which allow ultrafast signal processing for communications. These devices would take advantage of the material's fast response time, which is in the range of few tens of femtosecond to few hundreds of femtosecond. The search for the “right material” has been going on for over 25 years. Polydiacetylene-PTS (polymer poly (bis para-toluene sulfonate) of 2,4-hexadyine -1,6 diol) is one of such candidate. The first significant measurement was performed by Sauteret et al in 1976, when the large off-resonance third-order optical nonlinearity in PTS was reported. Since then, a number of investigations have been performed on this material and with different polydiacetylenes. However, due to the poor processibility and the complex nonlinearity of the material, there are many questions remain unanswered. Therefore, better understanding of the material is necessary for possible device applications as well as for a model study of such systems.; In this dissertation, multi-photon effects are reported in single crystals of PTS. Using modified growth and polymerization techniques, high optical quality crystals were grown. From the known one- and two-photon absorption spectra, the enhancement of four-photon absorption by three-photon absorption was expected at the wavelength range of 1600 to 2000 nm. Four-photon absorption was measured by Z-Scan technique in that region of the spectrum to yield α 4 = 0.01 cm5/GW3 at its peak wavelength of 1900 nm. This is a rare phenomenon in nonlinear optics, which has never been seen in any material system before. The dispersion of the nonlinear refractive index as well as linear absorption was also measured in this wavelength range.; In addition, new measurement techniques, Power-Scan and Polarization-Scan were developed to overcome some of the disadvantages of Z-Scan measurements for PTS.
机译：π共轭聚合物由于π电子沿着聚合物主链的离域化而具有较高的χ（3）非线性，因此在许多研究领域引起了人们的兴趣，例如物理，化学和材料科学。 π电子的一维强约束使效应非常大。材料的这一特性对于在全光学设备中的可能应用非常感兴趣，全光学设备允许超快信号处理以进行通信。这些设备将利用材料的快速响应时间，该响应时间在几十飞秒到几百飞秒的范围内。寻找“正确材料”的过程已经进行了25年以上。聚二乙炔-PTS（2，4-己基-1，6-二醇的聚合物聚（双对甲苯磺酸酯））是这种候选物之一。第一次重要的测量是由Sauteret等人在1976年进行的，当时报道了PTS中存在较大的非共振三阶光学非线性。从那时起，已经对该材料和不同的聚二乙炔进行了许多研究。但是，由于材料的可加工性差和复杂的非线性，仍有许多问题尚未解决。因此，对于可能的设备应用以及对此类系统的模型研究，必须对材料有更好的了解。本文报道了PTS单晶中的多光子效应。使用改良的生长和聚合技术，可以生长出高质量的光学晶体。从已知的一光子和二光子吸收光谱，可以预期在1600至2000nm的波长范围内三光子吸收会增强四光子吸收。通过Z扫描技术在该光谱区域中测量四光子吸收，从而在0℃产生α 4 = 0.01 cm 5 / GW 3 其峰值波长为1900 nm。这是非线性光学中罕见的现象，以前在任何材料系统中都从未见过。在该波长范围内也测量了非线性折射率的色散以及线性吸收。此外，还开发了新的测量技术Power-Scan和Polarization-Scan，以克服针对PTS的Z-Scan测量的某些缺点。

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  • 作者

    Yoshino, Fumiyo.;

  • 作者单位

    University of Central Florida.;

  • 授予单位 University of Central Florida.;
  • 学科 Physics Optics.; Engineering Materials Science.
  • 学位 Ph.D.
  • 年度 2003
  • 页码 123 p.
  • 总页数 123
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 光学;工程材料学;
  • 关键词

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