Single gallium nitride nanowire lasers
Single gallium nitride nanowire lasers
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DOI：
10.1038/nmat728
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发表时间：
2002-10-01
期刊：
影响因子：
41.2
通讯作者：
Saykally, RJ
中科院分区：
文献类型：
--
作者：
Johnson, JC;Choi, HJ;Saykally, RJ
目前人们对半导体纳米线的光学特性非常感兴趣，因为其圆柱形几何形状和对电子、空穴和光子的强二维约束使其成为纳米级电子学和光电子器件（包括激光器和非线性光学频率转换器）的潜在构建块特别有吸引力。氮化镓（GaN）是一种非常实用的宽带隙半导体，因为它广泛应用于电泵浦紫外-蓝色发光二极管、激光器和光电探测器中。微加工技术的最新进展使得从各种GaN微结构和薄膜中观察到受激发射成为可能。本文报道了紫外-蓝色激光在单晶GaN纳米线中的作用，利用近场和远场光学显微镜对室温下辐射的波导模式结构和光谱特性进行了表征。光学显微镜图像显示了与激光光谱中观察到的轴向法布里-珀罗模式（Q≈103）相关的辐射模式，这是由于单晶纳米线的圆柱形腔几何结构造成的。强依赖于泵浦功率（45 meV μJ cm−2）的红移支持了电子-空穴等离子体机制是室温下增益的主要原因的观点。该研究是实现电子注入纳米线紫外光蓝相干光源的重要进展。
There is much current interest in the optical properties of semiconductor nanowires, because the cylindrical geometry and strong two-dimensional confinement of electrons, holes and photons make them particularly attractive as potential building blocks for nanoscale electronics and optoelectronic devices,, including lasers,and nonlinear optical frequency converters. Gallium nitride (GaN) is a wide-bandgap semiconductor of much practical interest, because it is widely used in electrically pumped ultraviolet–blue light-emitting diodes, lasers and photodetectors,. Recent progress in microfabrication techniques has allowed stimulated emission to be observed from a variety of GaN microstructures and films,. Here we report the observation of ultraviolet–blue laser action in single monocrystalline GaN nanowires, using both near-field and far-field optical microscopy to characterize the waveguide mode structure and spectral properties of the radiation at room temperature. The optical microscope images reveal radiation patterns that correlate with axial Fabry–Perot modes (Q≈ 103) observed in the laser spectrum, which result from the cylindrical cavity geometry of the monocrystalline nanowires. A redshift that is strongly dependent on pump power (45 meV μJ cm−2) supports the idea that the electron–hole plasma mechanism is primarily responsible for the gain at room temperature. This study is a considerable advance towards the realization of electron-injected, nanowire-based ultraviolet–blue coherent light sources.