材料科学
马朗戈尼效应
激光器
表面等离子体激元
等离子体子
光电子学
光学
表面等离子体子
极化(电化学)
表面张力
化学
物理
物理化学
量子力学
作者
Kang Xu,Lingyu Huang,Zhou Xuan-zheng,Mandong Zheng,Min Wang,Shaoin Xu
出处
期刊:Optics Letters
[The Optical Society]
日期:2024-02-22
卷期号:49 (7): 1778-1778
被引量:1
摘要
Laser-induced subwavelength nanogratings on films find widespread applications in enhancing a spectrum through surface plasmon excitation. It is challenging to achieve high uniformity, diversity, and controllability due to the intricate interplay between two basic mechanisms in laser nanostructuring: the Marangoni effect and surface plasmon polaritons (SPPs). We tune the coupled effect on Ge 2 Sb 2 Te 5 films by adjusting the laser polarization, whose component controls the two effects’ strength ratio. The Marangoni effect dominates when the SPPs’ direction mismatches with the growing direction of nanogratings. Tuning this competition relationship helps to create nanogratings with tunable duty cycle and distribution, which are significant for light modulation applications. A highly efficient direct writing method with a line-shaped laser beam is employed to create large-area regular nanogratings by enhancing the effect tuning. We demonstrate diverse Au nanogratings with the aid of a lift-off operation and apply them in surface plasmon-coupled emission (SPCE), showcasing exceptional enhancement and narrowing performance.
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