Wu Tingting, Shum Perry Ping, Shao Xuguang, Huang Tianye, Sun Yunxu
Opt Express. 2014 Oct 6;22(20):24367-77. doi: 10.1364/OE.22.024367.
The conversion efficiency of third harmonic generation (THG) from mid-IR (3600 nm) to near-IR (1200 nm) regions in a silicon-silicon-nanocrystal hybrid plasmonic waveguide (SSHPW) was calculated. The required modal phase-matching condition (PMC) between the 0-th mode at fundamental wave (FW) and the 2-nd mode at third harmonic (TH) is achieved by carefully designing the waveguide geometry. Benefiting from the hybridized surface plasmon polariton (SPP) nature of the two guided modes, the SSHPW is capable of achieving both high THG nonlinear coefficient |I₆| and reasonable linear propagation loss, thereby resulting in large figure-of-merits (FOMs) for both FW and TH. According to our simulation, THG conversion efficiency up to 0.823% is achieved at 62.9 ����m SSHPW with pump power of 1 W.
计算了硅-硅纳米晶体混合等离子体波导（SSHPW）中从红外中波（3600纳米）到近红外（1200纳米）区域的三次谐波产生（THG）的转换效率。通过精心设计波导几何结构，实现了基波（FW）的第0模式与三次谐波（TH）的第2模式之间所需的模式相位匹配条件（PMC）。受益于两种导模的混合表面等离激元极化激元（SPP）特性，SSHPW能够实现高THG非线性系数|I₆|和合理的线性传播损耗，从而在FW和TH中都产生较大的品质因数（FOM）。根据我们的模拟，在泵浦功率为1W的62.9μm SSHPW中，THG转换效率高达0.823%。
