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Near-field and far-field engineering of semiconductor lasers.

机译：半导体激光器的近场和远场工程。

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摘要

Plasmonics focuses on the interaction between light and metallic films or nanostructures. In the last two decades, intensive research efforts were devoted to exploring the extremely broad applications of plasmonics.;My research combines the versatility of plasmonics with active light sources, i.e., quantum cascade lasers (QCLs). This thesis focuses on the application of plasmonics in near-field and far-field engineering of semiconductor lasers, specifically, subwavelength focusing in the near-field, and laser beam collimation and polarization control.;The first chapter of this thesis lays out fundamental materials necessary for understanding the following chapters. Systematic simulation and experimental results are presented in Chapter 2 to demonstrate that the integration of a suitably designed one dimensional or two dimensional plasmonic structures on the facet of QCLs can reduce the beam divergence by more than one order of magnitude. The devices with optimized collimators preserve a high output power, comparable to that of the unpatterned lasers.;Chapter 3 demonstrates that the polarization state of the output of semiconductor lasers can be controlled by defining plasmonic structures on the laser facet. An integrated plasmonic polarizer can project the polarization of a semiconductor laser onto other directions. By patterning a facet with two orthogonal grating-aperture structures, a QCL can produce emission consisting of a superposition of a linearly and right-circularly polarized light, a first step towards a circularly-polarized laser.;Chapter 4 presents experimental work on the coupled-rod antennas and the bowtie antennas patterned on the facet of QCLs. Both designs can provide an optical field confinement on the order of lambda/50 and with peak intensity on the order of 1 GW/cm2 in the antenna gap. The bowtie devices are more advanced due to better confinement of light into a single spot.;Chapter 5 and 6 discuss two side research topics. Chapter 5 investigates four-wave mixing interaction between the transverse modes of quantum cascade lasers originating from the strong optical nonlinearity of the gain transition. The last chapter discusses that the near-field transfer of radiation energy from an optically excited atomic dipole to a metallic film in the vicinity can greatly enhance the decay rate of the dipole in a well-controllable and predictable way.
机译：等离子体技术着重于光与金属膜或纳米结构之间的相互作用。在过去的二十年中，致力于研究等离子激元的广泛应用。;我的研究将等离子激元的多功能性与有源光源（即量子级联激光器（QCL））相结合。本文主要研究等离子体在半导体激光器近场和远场工程中的应用，特别是近场中的亚波长聚焦，激光束准直和偏振控制。是理解以下各章所必需的。第2章介绍了系统仿真和实验结果，以证明在QCL面上集成适当设计的一维或二维等离激元结构可以将光束发散减小一个数量级以上。具有优化准直器的设备可保持较高的输出功率，可与无图案激光器相媲美。第三章证明，可以通过在激光面上定义等离子体激元结构来控制半导体激光器输出的偏振态。集成的等离子偏振器可以将半导体激光器的偏振方向投射到其他方向。通过用两个正交的光栅孔径结构对刻面进行构图，QCL可以产生由线性和右旋圆偏振光的叠加组成的发射，这是向圆偏振激光的第一步。第4章介绍了耦合的实验工作。 QCL面上刻有杆状天线和领结天线。两种设计都可以提供λ/ 50量级的光场限制，并在天线间隙中提供1 GW / cm2量级的峰值强度。蝴蝶结装置由于将光更好地限制在一个点上而更加先进。；第5章和第6章讨论了两个侧面研究主题。第五章研究了量子级联激光器的横向模式之间的四波混合相互作用，这是由增益跃迁的强光学非线性引起的。最后一章讨论了辐射能量从光激发原子偶极子到附近金属膜的近场转移，可以以可控和可预测的方式极大地提高偶极子的衰减率。

著录项

  • 作者

    Yu, Nanfang.;

  • 作者单位

    Harvard University.;

  • 授予单位 Harvard University.;
  • 学科 Engineering Electronics and Electrical.;Physics Optics.
  • 学位 Ph.D.
  • 年度 2009
  • 页码 184 p.
  • 总页数 184
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 无线电电子学、电信技术;光学;
  • 关键词

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