Li L, Li T, Wang S M, Zhu S N
National Laboratory of Solid State Microstructures, School of Physics, College of Engineering and Applied Sciences, Nanjing University, Nanjing 210093, China.
Phys Rev Lett. 2013 Jan 25;110(4):046807. doi: 10.1103/PhysRevLett.110.046807.
We worked out a new group of collimated plasmon beams by the means of in-plane diffraction with symmetric phase modulation. As the phase type changes from 1.8 to 1.0, the beam undergoes an interesting evolution from focusing to a straight line. Upon this, an intuitive diagram was proposed to elucidate the beam nature and answer the question of whether they are nondiffracting or linear focusing. Based on this diagram, we further achieved a highly designable scheme to modulate the beam intensity (e.g., "lossless" plasmon). Our finding holds remarkable generality and flexibility in beam engineering and would inspire more intriguing photonic designs.
我们通过具有对称相位调制的面内衍射方法得出了一组新的准直等离子体光束。随着相位类型从1.8变为1.0，光束经历了从聚焦到直线的有趣演变。据此，提出了一个直观的示意图来阐明光束的性质，并回答它们是否为无衍射或线性聚焦的问题。基于此示意图，我们进一步实现了一种高度可设计的方案来调制光束强度（例如，“无损”等离子体）。我们的发现在光束工程中具有显著的通用性和灵活性，并将激发更多有趣的光子设计。
