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Zhu L, Zhao XS, Liu C, Fu SN, Wang YC et al. Flexible rotation of transverse optical field for 2D self-accelerating beams with a designated trajectory. Opto-Electron Adv 4, 200021 (2021).. doi: 10.29026/oea.2021.200021
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Flexible rotation of transverse optical field for 2D self-accelerating beams with a designated trajectory
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Abstract
Self-accelerating beams have the unusual ability to remain diffraction-free while undergo the transverse shift during the free-space propagation. We theoretically identify that the transverse optical field distribution of 2D self-accelerating beam is determined by the selection of the transverse Cartesian coordinates, when the caustic method is utilized for its trajectory design. Based on the coordinate-rotation method, we experimentally demonstrate a scheme to flexibly manipulate the rotation of transverse optical field for 2D self-accelerating beams under the condition of a designated trajectory. With this scheme, the transverse optical field can be rotated within a range of 90 degrees, especially when the trajectory of 2D self-accelerating beams needs to be maintained for free-space photonic interconnection.-
Keywords:
- self-accelerating beams /
- optical field /
- caustic
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References
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Zhu L, Zhao XS, Liu C, Fu SN, Wang YC et al. Flexible rotation of transverse optical field for 2D self-accelerating beams with a designated trajectory. Opto-Electron Adv 4, 200021 (2021).. doi: 10.29026/oea.2021.200021
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Figure 1.
Generation of 2D self-accelerating beam based on optical caustic and the rotation principle of transverse optical field for 2D self-accelerating beam. Two perpendicular components (a)−(b) of trajectory and light rays in default Cartesian coordinates. (c) The projection of multiplexed trajectory and the distribution of transverse optical field in default Cartesian coordinates; two perpendicular components (d)−(e) of trajectory and light rays in rotated Cartesian coordinates. (f) The projection of multiplexed trajectory and the rotated distribution of transverse optical field in rotated Cartesian coordinates.
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Figure 2.
Experimental setup for the optical field rotation of 2D self-accelerating beams. DFB: distributed feedback laser; Col.: collimator; PC: polarizer controller; P: polarizer; BS: beam splitter; SLM: spatial light modulator.
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Figure 3.
Different phase patterns and their calculated 3D optical distribution and trajectories. (a) Original phase pattern and its (b) 3D optical distribution and (c) the projection of trajectory. (d) Simply rotated phase pattern for -30° and corresponding (e) 3D optical distribution and (f) the projection of trajectory. (g), (j) Re-calculated phase patterns for -30° and 15°, and (h), (k) their 3D optical distribution and (i), (l) the projection of trajectory.
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Figure 4.
Calculated and experimental results for the optical field rotation of 2D Airy beam at different propagation distances. (a − c) Calculated phase patterns. (d − f), (j − l), (p − r) Simulated and (g − i), (m − o), (s − u) experimental intensity profiles at distance of 0, 0.3 m and 0.6 m with a rotation angle of -30°, 0° and 15°, respectively.
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Figure 5.
Obstacle evasion experiment. (a) set-up; normalized received optical power with obstacle’s angle β of (b) -15° (c) 0° and (d) 30°. (blue solid curves are calculated results, and red dotted curves denote the experimental results.)
