Dr. Qi Tan Profile

Dr. Qi Tan

at Tianjin Univ.

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Proceedings Article | 26 November 2023 Poster + Paper

Multi-topological charges vortex beam generator based on nonlinear bound states in the continuum with improvement of nonlinear conversion efficiency

Hang Xu, Hui Li, Qi Tan, Chunyu Song, Yating Zhang, Bo Wang, Jie Li, Jianquan Yao

Proceedings Volume 12775, 127751K (2023) https://doi.org/10.1117/12.2688659

KEYWORDS: High harmonic generation, Photonic crystals, Optical vortices, Mirrors, Electric fields

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In the momentum space of bound states in the continuum (BIC), vortex configurations around the Γ-point are generated by the selection rules. The electric field distribution close to the BIC satisfies twofold rotational symmetry (C₂). Since the periodic structure of 2D photonic crystals (PhCs) supports the generation of odd harmonics, this characteristic provides an attractive approach for generating high-harmonic optical vortex (OV) beams with both left and right handedness. Also, the topological charge of OV beams generated by C_4v-symmetric PhCs can be further improved by an increase of structural symmetry. Moreover, since the nonlinear conversion efficiency of directly used PhCs is low, their practicability is limited. Here, a hexagonal arrangement of C_6v-symmetric 2D PhCs slab is selected. Through energy band selection, higher order fundamental and nonlinear OV beams can be generated, which can not only cover the topological charge of the C_4v-symmetric structure, but also generate more abundant topological charge. In addition, we improve the third-order nonlinear conversion efficiency by the mirror approach, which is 22 times greater than with the direct use of PhCs. This method can improve the channel capacity of OV generators based on BICs and make them more practical.

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