光学
激光器
超短脉冲
等离子体子
材料科学
高斯光束
空间光调制器
光电子学
物理
梁(结构)
作者
Wenhe Jia,Chenxin Gao,Yi Zhao,Liu Li,Shun Wen,Shuai Wang,Chengying Bao,Chunping Jiang,Changxi Yang,Yuanmu Yang
出处
期刊:Advanced photonics
[SPIE - International Society for Optical Engineering]
日期:2023-02-22
卷期号:5 (02)
被引量:8
标识
DOI:10.1117/1.ap.5.2.026002
摘要
Optical metasurfaces are endowed with unparallel flexibility to manipulate the light field with a subwavelength spatial resolution. Coupling metasurfaces to materials with strong optical nonlinearity may allow ultrafast spatiotemporal light field modulation. However, most metasurfaces demonstrated thus far are linear devices. Here, we experimentally demonstrate simultaneous spatiotemporal laser mode control using a single-layer plasmonic metasurface strongly coupled to an epsilon-near-zero (ENZ) material within a fiber laser cavity. While the geometric phase of the metasurface is utilized to convert the laser’s transverse mode from a Gaussian beam to a vortex beam carrying orbital angular momentum, the giant nonlinear saturable absorption of the ENZ material enables pulsed laser generation via the Q-switching process. The direct integration of a spatiotemporal metasurface in a laser cavity may pave the way for the development of miniaturized laser sources with tailored spatial and temporal profiles, which can be useful for numerous applications, such as superresolution imaging, high-density optical storage, and three-dimensional laser lithography.
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