基于两种暗表面等离子体激元的低激光阈值且可广泛调谐的表面等离激元激射器
A low lasing threshold and widely tunable spaser based on two dark surface plasmons.
作者信息
Huo Yanyan, Jia Tianqing, Ning Tingyin, Tan Chaohua, Jiang Shouzhen, Yang Cheng, Jiao Yang, Man Baoyuan
机构信息
Shandong Provincial Key Laboratory of Optics and Photonic Devices, School of Physics and Electronics, Shandong Normal University, Jinan, 250014, China.
State Key Laboratory of Precision Spectroscopy, Department of Physics, East China Normal University, Shanghai, 200062, P.R. China.
出版信息
Sci Rep. 2017 Oct 19;7(1):13590. doi: 10.1038/s41598-017-12463-8.
We theoretically demonstrate a low threshold and widely tunable spaser based on a plasmonic nanostructure consisting of two sets of disk-rings (TSDR). The TSDR nanostructure supports two dark surface plasmons (SPs), which are excited simultaneously by two bright SPs at Fano dips. The two dark SPs support lower effective mode volume, higher quality factor and higher Purcell factors. When the dark SPs serve as the pumping and lasing mode of a spaser, the spaser has a lower lasing threshold, a higher pump absorption efficiency and a lower threshold absorbed pump power than the spaser based on a bright SP. In addition, the lasing and pumping wavelengths of the spaser proposed in this article can each be tuned over a very wide wavelength range. Our results should be significant for the development of spasers.
我们从理论上证明了一种基于由两组盘环（TSDR）组成的等离子体纳米结构的低阈值且可广泛调谐的表面等离激元激射器（spaser）。TSDR纳米结构支持两种暗表面等离激元（SPs），它们在法诺凹陷处被两种亮SPs同时激发。这两种暗SPs具有更低的有效模式体积、更高的品质因数和更高的珀塞尔因子。当暗SPs用作spaser的泵浦和激射模式时，与基于亮SP的spaser相比，该spaser具有更低的激射阈值、更高的泵浦吸收效率和更低的阈值吸收泵浦功率。此外，本文提出的spaser的激射波长和泵浦波长均可在非常宽的波长范围内进行调谐。我们的结果对于spaser的发展应该具有重要意义。
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