Journal
PHYSICAL REVIEW A
Volume 105, Issue 4, Pages -Publisher
AMER PHYSICAL SOC
DOI: 10.1103/PhysRevA.105.043516
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Funding
- Fundamental Research Funds for the Central Universities [2019QNA31]
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An arbitrary conical angle is introduced to study the propagation properties of circular Airy beams beyond the paraxial approximation. It is found that the nonparaxiality becomes obvious for large conical angles, and the field intensity at the focal point can be enhanced by adjusting the conical angle. Moreover, the longitudinal component of the field is enhanced and the longitudinal gradient of the field intensity is enlarged for large conical angles, suggesting the possibility of stable optical trapping for microparticles.
An arbitrary conical angle is introduced to the circular Airy beam (CAB) beyond the paraxial approximation, with the possibility to demonstrate its obvious tunability for the propagation properties of the CAB. The expressions are worked out to describe the electric field based on the angular spectrum representation, where a closed-form approximation of the angular spectrum is derived by using the stationary phase method. It is found that the nonparaxiality becomes obvious for large conical angles. In particular, the field intensity at the focal point can be enhanced about 10 times with respect to the conventional CAB by simply tailoring the conical angle. Meanwhile, the longitudinal component of the field is enhanced and gradually plays a leading role as the conical angle is increased. Moreover, the longitudinal gradient of the field intensity is also enlarged for large conical angles, suggesting a stable optical trapping for microparticles, which may find many applications in optical manipulations.
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