Impact of Fundamental Temperature Fluctuations on the Frequency Stability of Metallo- Dielectric Nanolasers
Impact of Fundamental Temperature Fluctuations on the Frequency Stability of Metallo- Dielectric Nanolasers
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DOI：
10.1109/jqe.2019.2936592
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发表时间：
2019-10
影响因子：
2.5
通讯作者：
Sizhu Jiang;S. H. Pan;Suruj S. Deka;Cheng-Yi Fang;Zijun Chen;Y. Fainman;A. El Amili
中科院分区：
文献类型：
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作者：
Sizhu Jiang;S. H. Pan;Suruj S. Deka;Cheng-Yi Fang;Zijun Chen;Y. Fainman;A. El Amili
纳米激光器在小体积谐振器中产生相干光的能力使得它们在未来的超紧凑光子集成电路中具有吸引力。然而，与传统激光器相比，纳米激光器还以其更宽的光谱线宽而闻名，通常在1 nm的量级上。虽然众所周知，光发射器中的宽线宽源于各种噪声源，但据我们所知，迄今为止还没有对评估纳米激光器线宽加宽的起源进行严格的研究。在这篇手稿中，我们研究了基本的热涨落对纳米激光线宽的影响。我们表明，这种热涨落是一个内在的噪声源，在亚波长金属包层纳米激光器诱导显着的线宽展宽。我们进一步表明，随着纳米激光器尺寸的减小，即，模式体积和环境温度的增加，由于更显著的基本热波动的影响，这种线宽加宽被增强。具体地说，我们表明，在室温下的热涨落诱导的有限线宽为1.14 nm和0.16 nm，分别为核心半径为250 nm和750 nm的纳米激光器。虽然我们的研究是在金属介电纳米激光器上进行的，但可以合理地假设，一般来说，其他纳米激光器架构也更容易受到热波动的影响，因此表现出比传统大模体积激光器更大的有限线宽。
The capability of nanolasers to generate coherent light in small volume resonators has made them attractive to be implemented in future ultra-compact photonic integrated circuits. However, compared to conventional lasers, nanolasers are also known for their broader spectral linewidths, that are usually on the order of 1 nm. While it is well known that the broad linewidths in light emitters originate from various noise sources, there has been no rigorous study on evaluating the origins of the linewidth broadening for nanolasers to date to the best of our knowledge. In this manuscript, we investigate the impact of fundamental thermal fluctuations on the nanolaser linewidth. We show that such thermal fluctuations are one of the intrinsic noise sources in a sub-wavelength metal-clad nanolaser inducing significant linewidth broadening. We further show that with the reduction of the nanolaser’s dimensions, i.e., mode volume, and the increase of the ambient temperature, such linewidth broadening is enhanced, due to the effect of more pronounced fundamental thermal fluctuation. Specifically, we show that the finite linewidths induced by the thermal fluctuations at room temperature are 1.14nm and 0.16nm, for nanolasers with core radii of 250nm and 750nm, respectively. Although our study was performed on a metallo-dielectric nanolaser, it is reasonable to assume that, in general, other nanolaser architectures are also more prone to thermal fluctuations, and hence exhibit larger finite linewidths than conventional large mode volume lasers.