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摘要: 首次提出一种新的梯度轴棱锥模型，这种梯度轴棱锥在传统的轴棱锥基础上，将轴棱锥顶点的锥角设计成具有一定的梯度.平面波入射到这种梯度轴棱锥，其衍射场会形成两个区域的Bessel光，并且在这两个Bessel光之间形成一个Bottle beam（局域空心光束）.由于Bottle beam具有三维封闭的空心区域和极高的强度梯度，可用作激光导管、光镊和光学扳手等，在生命科学和纳米科技中有重要应用.从几何光学角度分析了梯度轴棱锥形成单个Bottle beam的原理，由衍射及相干理论，分析和模拟了纵向剖面光强分布和横截面光强分布.研究结果对梯度轴棱锥的设计和应用具有指导意义.
Abstract: A new model of double-axicon was proposed for the first time. Based on the traditional axicon，a gradient on the vertex of an axicon was designed. When a plane wave illuminates the gradient axicon，two Bessel beams are formed and a Bottle beam generated between the Bessel beams. Bottle beams could be used as optical pipes，optical tweezers，optical spanners, and so on.Because the dark focus is surrounded in all directions by regions of higher intensity，and it shows important application perspective in life science and nanotechnology. The formation mechanism of the single Bottle beam was analyzed by geometrical optics. The transverse and longitudinal intensity distribution were also calculated and simulated using diffraction and interference theory，respectively. The result shows its significance in providing a guidance for the design and application of the gradient axicon.
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