Observation of the asymmetric Bessel beams with arbitrary orientation using a digital micromirror device.
Recently, V. V. Kotlyar et al. [Opt. Lett.39, 2395 (2014)] have theoretically proposed a novel kind of three-parameter diffraction-free beam with a crescent profile, namely, the asymmetric Bessel (aB) beam. The asymmetry degree of such nonparaxial modes was shown to depend on a nonnegative real parameter c. We present a more generalized asymmetric Bessel mode in which the parameter c is a complex constant. This parameter controls not only the asymmetry degree of the mode but also the orientation of the optical crescent, and affects the energy distribution and orbital angular momentum (OAM) of the beam. As a proof of concept, the high-quality generation of asymmetric Bessel-Gauss beams was demonstrated with the super-pixel method using a digital micromirror device (DMD). We investigated the near-field properties as well as the far field features of such beams, and the experimental observations were in good agreement with the theoretical predictions. Additionally, we provided an effective way to control the beam's asymmetry and orientation, which may find potential applications in light-sheet microscopy and optical manipulation.
Lei
L
Gong
Xing-Ze
XZ
Qiu
Yu-Xuan
YX
Ren
Hui-Qing
HQ
Zhu
Wei-Wei
WW
Liu
Jin-Hua
JH
Zhou
Min-Cheng
MC
Zhong
Xiu-Xiang
XX
Chu
Yin-Mei
YM
Li