耦合到TiO2纳米柱的ZnO纳米线激光模式控制
Lasing Mode Control in ZnO Nanowires Coupled to TiO2 Nanopillars
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中文总结 AI 辅助
本研究通过ZnO纳米线与TiO2纳米柱的近场耦合，实验实现了纳米线激光器单个激光模式的选择性窄带抑制，并揭示了两种基于偏振匹配的耦合机制，为定制光子架构调控激光光谱提供了新途径。
中文摘要 AI 辅助
基于光谱宽增益材料的纳米线激光器通常表现出多模发射，这限制了它们在需要精确定义光谱特性的应用中的实用性。在本研究中，我们通过实验证明了在氧化锌（ZnO）纳米线激光器中，通过近场耦合到二氧化钛（TiO2）纳米柱，可以实现对单个激光模式的选择性窄带抑制。我们的研究基于激光状态下的光致发光光谱学，并辅以有限差分时域模拟。我们展示了纵向纳米线激光模式通过与适当尺寸纳米柱中的回音壁模式共振耦合而被抑制。除了耦合的光谱选择性外，我们还揭示了基于回音壁模式与纳米线波导模式之间偏振匹配的两种不同耦合机制。这些发现展示了一种通过定制光子架构来工程化纳米线激光器光谱发射特性的有前景的方法。
英文摘要
Nanowire lasers based on spectrally broad gain materials typically exhibit multimode emission, which limits their utility in applications requiring precisely defined spectral characteristics. In this study, we experimentally demonstrate the selective, narrow-band suppression of individual lasing modes in zinc oxide (ZnO) nanowire lasers through near-field coupling to titania (TiO2) nanopillars. Our study is based on photoluminescence spectroscopy in the lasing regime, which is complemented by finite-difference time-domain simulations. We show suppression of longitudinal nanowire lasing modes by their resonant coupling to the whispering gallery modes in nanopillars of suitable size. In addition to spectral selectivity of the coupling, we reveal two distinct coupling regimes based on polarization matching between whispering gallery modes and nanowire waveguide modes. These findings demonstrate a promising approach towards engineering the spectral emission properties of nanowire lasers through tailored photonic architectures.
发表机构
- Friedrich Schiller University Jena（耶拿弗里德里希·席勒大学）
- Fraunhofer Institute for Applied Optics and Precision Engineering（弗劳恩霍夫应用光学和精密工程研究所）
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