Whispering Gallery Modes: Impact of resonator shape on lasing properties

回音壁模式：谐振器形状对激光特性的影响

• 批准号: 233373922
• 负责人: Professor Dr. Marius Grundmann
• 金额: --
• 依托单位: Abteilung Halbleiterphysik
• 依托单位国家: 德国
• 项目类别: Research Grants
• 财政年份: 2013
• 资助国家: 德国
• 起止时间: 2012-12-31 至 2016-12-31
• 项目状态: 已结题
• 来源: https://gepris.dfg.de/gepris/projekt/233373922?language=en
• 关键词: Whispering; Gallery; Modes; Impact; resonator

Whispering gallery modes (WGM) are the dominating optical modes in prismatic micro- and nano-wires. Using ZnO as a model system, the correlation of real geometry and the optical properties in the transparency regime and lasing regime (close to the band edge) will be investigated. Optical modes shall be determined experimentally, polarisation and angularly resolved and under optical pumping. At the positions of optical investigation, the real geometry shall be determined using scanning electron microscopy in plan-view and for cross-sections, prepared by cleaving and focussed ion beam etching. Through comparison with theoretical models, the theory of WGM in realistic geometry shall be verified. Using the boundary element method WGM theory shall be extended with aspects which so far have been neglected but seem essential for real cavities: (i) dispersion of WGM (for wave-vector along the wire) and (ii) modes in hexagonal cavities with round corners and irregular cross-section, various aspect ratios and surface roughness. The close correlation of experiments and theory allows to draw general conclusions for the effect of real geometry on optical properties of polygonal cavities beyond the used ZnO model system.

回音壁模式（WGM）是棱镜微纳米线中的主要光学模式。以ZnO为模型系统，研究了透明区和激光区（靠近带边）的真实的几何结构与光学性质的相关性。光学模式应通过实验、偏振和角度分辨以及在光泵浦下确定。在光学研究位置，应使用扫描电子显微镜确定真实的几何形状的平面图和横截面，通过劈裂和聚焦离子束蚀刻制备。通过与理论模型的比较，验证了实际几何条件下的WGM理论。使用边界元法，WGM理论应扩展到迄今为止被忽略但对于真实的腔似乎是必不可少的方面：（i）WGM的色散（对于波矢量沿着线）和（ii）具有圆角和不规则横截面、各种纵横比和表面粗糙度的六边形腔中的模式。实验和理论的密切相关性，可以得出一般性的结论，真实的几何形状的多边形腔的光学性质超出所使用的ZnO模型系统的效果。

项目成果

Absorptive lasing mode suppression in ZnO nano- and microcavities

• DOI: 10.1063/1.4960660
• 发表时间: 2016-08
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: M. Wille;T. Michalsky;E. Krüger;M. Grundmann;R. Schmidt‐Grund

Lasing in cuprous iodide microwires

• DOI: 10.1063/1.4990524
• 发表时间: 2017-07
• 期刊: Applied Physics Letters
• 影响因子: 4
• 作者: M. Wille;E. Krüger;S. Blaurock;V. Zviagin;Rafael Deichsel;G. Benndorf;Lukas Trefflich;V. Gottschalch;H. Krautscheid;R. Schmidt‐Grund;M. Grundmann

Phonon-Assisted Lasing in ZnO Microwires at Room Temperature

• DOI: 10.1063/1.4902898
• 发表时间: 2014-10
• 期刊: arXiv: Materials Science
• 作者: T. Michalsky;M. Wille;C. Dietrich;R. Roder;C. Ronning;R. Schmidt‐Grund;M. Grundmann

Carrier density driven lasing dynamics in ZnO nanowires

• DOI: 10.1088/0957-4484/27/22/225702
• 发表时间: 2016-01
• 期刊: Nanotechnology
• 影响因子: 3.5
• 作者: M. Wille;C. Sturm;T. Michalsky;R. Röder;C. Ronning;R. Schmidt‐Grund;M. Grundmann