A new type of circular Airy beams is demonstrated by using a bandpass filter, in order to enhance the field intensity at the focal point of light beam, based on the angular spectrum representation and the ray optics picture. The specific ring and the key spatial frequency corresponding to the focal point are obtained, via the ray optics picture, to make the initial field concentrate near the specific ring in the real space. It is found that the field intensity at the focal point of the new type circular Airy beams is better enhanced than the common circular Airy beams and the modified circular Airy beams, and the enhancement effect can be tuned via the central spatial frequency, apodization steepness and width of the bandpass filter. The enhanced field intensity gives a very strong gradient force and may find applications on optical manipulation.

中文翻译：

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基于带通滤波器的圆形艾里光束

为了增强光束焦点处的场强，基于角光谱表示和射线光学图片，展示了一种新型圆形艾里光束，使用带通滤波器。通过射线光学图片得到特定环和焦点对应的关键空间频率，使初始场集中在真实空间中的特定环附近。发现新型圆形艾里光束焦点处的场强比普通圆形艾里光束和改良圆形艾里光束有更好的增强效果，增强效果可以通过中心空间频率、切趾陡度和带通滤波器的宽度。增强的场强提供了非常强的梯度力，可以应用于光学操作。