Enhancement of vertical emission in photonic crystal nanolasers
Enhancement of vertical emission in photonic crystal nanolasers
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DOI：
10.1063/1.3696056
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发表时间：
2012-03
影响因子：
4
通讯作者：
M. Narimatsu;S. Kita;H. Abe;T. Baba
中科院分区：
文献类型：
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作者：
M. Narimatsu;S. Kita;H. Abe;T. Baba
光子晶体纳米激光器存在垂直发射弱的缺点，从上到上都降低了探测效率。结果表明，在腔体中引入不对称性，使布里渊区边界附近的傅立叶分量向区中心移动，大大提高了垂直辐射强度。当用数值孔径为0.42的物镜从上方收集光输出时，优化后的器件的效率分别是原始结构的26倍和153倍。我们确认实验结果和计算结果是一致的。
Photonic crystal nanolasers have a drawback of weak vertical emission, which degrades the detection efficiency from above. We show that the vertical emission is enhanced greatly by introducing asymmetry to the cavity, so that Fourier components around the Brillouin zone boundary are shifted to the zone center. When the light output is collected from above by an objective lens with a numerical aperture of 0.42, the efficiency for the optimized devices, with and without nanoslot, are calculated to be 26 and 153 times that of the original structure. We confirm the experimental and calculated results to be in good agreement.