Plasmon-exciton coupling in hetero-bilayer of WSe₂ and WS₂ transferred onto Au nanorod arrays is studied. Dark-field scattering measurements reveal that the in-plain dipole moment of excitons in monolayer WS₂ allows only the narrow spectral range of 30 nm for the resonant coupling between the localized particle plasmons from Au nanorods and the bright excitons from WS₂. We demonstrate that the q-parameter that represents the asymmetry of Fano resonances from plasmon-exciton coupling can be controlled by the polarization states of incident light. Surface lattice resonances in between individual Au nanorods play a role to diminish the damping factor of plasmon-exciton coupling in the arrays.

研究了转移到Au纳米棒阵列上的WSe ₂和WS _2的异质双层中的等离子体激子耦合。暗场散射测量结果表明，单层WS ₂中激子的平面内偶极矩仅允许30 nm的窄光谱范围用于Au纳米棒的局部粒子等离激元与WS ₂的明亮激子之间的共振耦合。我们证明，代表等离子激子耦合的Fano共振的不对称性的q参数可以由入射光的偏振态控制。各个Au纳米棒之间的表面晶格共振起着减小阵列中等离激元-激子耦合的阻尼因子的作用。