[1] L. Allen, M. W. Beijersbergen, R. J. C. Spreeuw, J. P. Woerdman. Orbital angular momentum of light and the transformation of Laguerre-Gaussian laser modes. Phys. Rev. A, 45, 8185(1992).
[2] J. Wang, J. Y. Yang, I. M. Fazal, N. Ahmed, Y. Yan, H. Huang, Y. Ren, Y. Yue, S. Dolinar, M. Tur, A. E. Willner. Terabit free-space data transmission employing orbital angular momentum multiplexing. Nat. Photon., 6, 488(2012).
[3] G. M. Terriza, J. P. Torres, L. Torner. Twisted photons. Nat. Phys., 3, 305(2007).
[4] A. Mair, A. Vaziri, G. Weihs, A. Zeilinger. Entanglement of the orbital angular momentum states of photons. Nature, 412, 313(2001).
[5] C. Zhang, F. Pang, H. Liu, L. Chen, J. Yang, J. Wen, T. Wang. Highly efficient excitation of LP01 mode in ring-core fibers by tapering for optimizing OAM generation. Chin. Opt. Lett., 18, 020602(2020).
[6] T. Lin, A. Liu, X. Zhang, H. Li, L. Wang, H. Han, Z. Chen, X. Liu, H. Lü. Analyzing OAM mode purity in optical fibers with CNN-based deep learning. Chin. Opt. Lett., 17, 100603(2019).
[7] M. Scaffardi, M. N. Malik, E. Lazzeri, G. Meloni, F. Fresi, L. Poti, N. Andriolli, I. Cerutti, C. Klitis, L. Meriggi, N. Zhang, M. Sorel, A. Bogoni. A silicon microring optical 2 × 2 switch exploiting orbital angular momentum for interconnection networks up to 20 Gbaud. J. Lightwave Technol., 35, 3142(2017).
[8] J. Zhang, C. Z. Sun, B. Xiong, J. Wang, Z. B. Hao, L. Wang, Y. J. Han, H. T. Li, Y. Luo, Y. Xiao, C. Q. Yu, T. Tanemura, Y. Nakano, S. M. Li, X. L. Cai, S. Y. Yu. An InP-based vortex beam emitter with monolithically integrated laser. Nat. Commun., 9, 2652(2018).
[9] R. Li, X. Feng, D. Zhang, K. Cui, F. Liu, Y. D. Huang. Radially polarized orbital angular momentum beam emitter based on shallow-ridge silicon microring cavity. IEEE Photon. J., 6, 2200710(2014).
[10] X. Cai, J. Wang, M. J. Strain, B. Johnson-Morris, J. Zhu, M. Sorel, J. L. O’Brien, M. G. Thompson, S. Yu. Integrated compact optical vortex beam emitters. Science, 338, 363(2012).
[11] H. Li, D. B. Phillips, X. Wang, Y. D. Ho, L. Chen, X. Zhou, J. Zhu, S. Yu, X. Cai. Orbital angular momentum vertical-cavity surface-emitting lasers. Optica, 2, 547(2015).
[12] P. Miao, Z. Zhang, J. Sun, W. Walasik, S. Longhi, N. M. Litchinitser, L. Feng. Orbital angular momentum microlaser. Science, 353, 464(2016).
[13] X. Ma, Q. A. Chen, Q. Y. Lu, W. H. Guo. Grating assisted microcylinder surface-emitting laser. J. Lightwave Technol., 34, 4999(2016).
[14] X. Ma, S. Zheng, Q. Chen, S. Tan, P. Zhang, Q. Lu, J. Wang, W. Guo. High-speed directly modulated cylindrical vector beam laser. ACS Photon., 6, 3261(2019).
[15] L. Feng, Y.-L. Xu, W. S. Fegadolli, M.-H. Lu, J. E. B. Oliveira, V. R. Almeida, Y.-F. Chen, A. Scherer. Experimental demonstration of a unidirectional reflectionless parity-time metamaterial at optical frequencies. Nat. Material., 12, 108(2013).
[16] Y.-D. Yang, Y.-Z. Huang. Symmetry analysis and numerical simulation of mode characteristics for equilateral-polygonal optical microresonators. Phys. Rev. A, 76, 023822(2007).
[17] W. B. Zimmerman. Multiphysics Modeling with Finite Element Method(2006).
[18] A. Taflove, S. C. Hagness. Computational Electrodynamics: the Finite-Difference Time-Domain Method(2005).
[19] W. H. Guo, W. J. Li, Y. Z. Huang. Computation of resonant frequencies and quality factors of cavities by FDTD technique and Padé approximation. IEEE Microwave Wireless Compon. Lett., 11, 223(2001).
[20] L. A. Coldren, S. W. Corzine, M. L. Mashanovitch. Diode Lasers and Photonic Integrated Circuits(2012).
