Izadi Mohammad Amin, Nouroozi Rahman
Opt Lett. 2017 Apr 15;42(8):1564-1567. doi: 10.1364/OL.42.001564.
The propagation length enhancement of surface plasmon polariton (SPP) waves could lead to practical applications. This Letter proposes the numerically verified phase-sensitive nonlinear χ-based optical parametric amplification (OPA) for ultralong propagation of a SPP wave within an ultrawide bandwidth. The strong nonlinear interaction between the SPP mode and the hybrid guided mode, which limits the length enhancement, is mitigated in a silver-coated linearly chirped periodically poled lithium niobate planar waveguide via slowly phase-matched OPA. Obtained results indicate an ultralong propagation length for a SPP mode of about 4 cm when a 135 MW/cm pump intensity is launched. The acceptance bandwidth of the amplified SPP shows its dependency on the pump intensity; for a pump intensity range between 70 and 135 MW/cm, the acceptance bandwidth is still ultrawide, varying from 28 to 18 nm, respectively.
表面等离激元极化激元（SPP）波的传播长度增强可带来实际应用。本文提出了一种基于相位敏感非线性χ的光学参量放大（OPA）方法，经数值验证可实现SPP波在超宽带宽内的超长传播。在镀银的线性啁啾周期极化铌酸锂平面波导中，通过慢相位匹配OPA减轻了限制长度增强的SPP模式与混合导模之间的强非线性相互作用。所得结果表明，当泵浦强度为135 MW/cm²时，SPP模式的传播长度约为4 cm。放大后的SPP的接收带宽显示出其对泵浦强度的依赖性；对于70至135 MW/cm²的泵浦强度范围，接收带宽仍然超宽，分别从28 nm变化到18 nm。
