The corner effect in hexagonal whispering gallery microresonators
The corner effect in hexagonal whispering gallery microresonators
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DOI：
10.1063/1.4757572
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发表时间：
2012-10-01
影响因子：
4
通讯作者：
Grundmann, M.
中科院分区：
文献类型：
--
作者：
Dietrich, C. P.;Lange, M.;Grundmann, M.
研究了异质结微谐振器的纳米尺度几何形状对回音壁模式的光耦合、模式品质因子和激射阈值的影响。为此，我们采用碳热气相输运法生长了具有六方截面的ZnO微米线。结果表明，它们的角可以是尖锐的（曲率半径r（C）< 10 nm）或钝的（r（C）近似400 nm）。钝角在低激发状态下增强了WGM的光耦合输出，但在其他情况下增加了模式线宽。尖角在低激发下阻碍光耦合输出，导致长腔光子寿命，并促进室温WGM在73 kW/cm（2）的最低报告激光阈值下产生激光。(C)2012年美国物理学会。[http：//dx.doi.org/10.1063/1.4757572]
Hexagonal microresonators were investigated regarding the influence of the nanometer scale geometry of their corners on light out-coupling, mode quality factor, and lasing threshold of whispering gallery modes (WGMs). For this purpose, ZnO microwires with hexagonal cross section grown by carbothermal vapor-phase transport were fabricated. It turned out that their corners can either be sharp (curvature radius r(C) < 10 nm) or be blunt (r(C) approximate to 400 nm). Blunt corners enhance light out-coupling of WGM in the low-excitation regime but otherwise increase mode linewidth. Sharp corners hinder light out-coupling at low excitations leading to long cavity photon lifetimes and facilitating room-temperature WGM lasing at lowest reported lasing thresholds of 73 kW/cm(2). (C) 2012 American Institute of Physics. [http://dx.doi.org/10.1063/1.4757572]