Wang Sen, Zhang Jing, Fu Maixia, He Jingwen, Li Xing
Shandong Provincial Engineering and Technical Center of Light Manipulations & Shandong Provincial Key Laboratory of Optics and Photonic Device, College of Physics and Electronics, Shandong Normal University, Jinan 250014, China.
Key Laboratory of Grain Information Processing and Control, College of Information Science and Engineering, Henan University of Technology, Zhengzhou 450001, China.
Nanomaterials (Basel). 2021 Nov 3;11(11):2941. doi: 10.3390/nano11112941.
Multifunctional optical devices are desirable at all times due to their features of flexibility and high efficiency. Based on the principle that the phase of excitation light can be transferred to the generated surface plasmon polaritons (SPPs), a plasmonic grating with three functions is proposed and numerically demonstrated. The Cherenkov SPPs wake or nondiffracting SPPs Bessel beam or focusing SPPs field can be correspondingly excited for the excitation light, which is modulated by a linear gradient phase or a symmetrical phase or a spherical phase, respectively. Moreover, the features of these functions such as the propagation direction of SPPs wake, the size and direction of the SPPs Bessel beam, and the position of SPPs focus can be dynamically manipulated. In consideration of the fact that no extra fabrication is required to obtain the different SPPs fields, the proposed approach can effectively reduce the cost in practical applications.
多功能光学器件因其灵活性和高效性的特点而一直备受青睐。基于激发光的相位可以转移到所产生的表面等离激元极化激元（SPPs）这一原理，提出了一种具有三种功能的等离激元光栅，并进行了数值验证。对于分别由线性梯度相位、对称相位或球面相位调制的激发光，可相应地激发切伦科夫表面等离激元极化激元尾波或非衍射表面等离激元极化激元贝塞尔光束或聚焦表面等离激元极化激元场。此外，这些功能的特性，如表面等离激元极化激元尾波的传播方向、表面等离激元极化激元贝塞尔光束的尺寸和方向以及表面等离激元极化激元焦点的位置，都可以动态操控。考虑到无需额外制造即可获得不同的表面等离激元极化激元场这一事实，所提出的方法在实际应用中可以有效降低成本。
