[1] R. Loudon, C. Baxter. Contributions of John Henry Poynting to the understanding of radiation pressure. Proc. Royal Soc. London A, 468, 1825-1838(2012).

[2] J. D. Jackson. Classical Electrodynamics(1999).

[3] L. Allen, M. W. Beijersbergen, R. Spreeuw, J. Woerdman. Orbital angular momentum of light and the transformation of Laguerre–Gaussian laser modes. Phys. Rev. A, 45, 8185-8189(1992).

[4] G. Gibson, J. Courtial, M. Padgett, M. Vasnetsov, V. Pas’ko, S. Barnett, S. Franke-Arnold. Free-space information transfer using light beams carrying orbital angular momentum. Opt. Express, 12, 5448-5456(2004).

[5] A. M. Yao, M. J. Padgett. Orbital angular momentum: origins, behavior and applications. Adv. Opt. Photon., 3, 161-204(2011).

[6] B. Thidé, H. Then, J. Sjoholm, K. Palmer, J. Bergman, T. D. Carozzi, Y. N. Istomin, N. H. Ibragimov, R. Khamitova. Utilization of photon orbital angular momentum in the low-frequency radio domain. Phys. Rev. Lett., 99, 087701(2007).

[7] F. Tamburini, E. Mari, A. Sponselli, B. Thidé, A. Bianchini, F. Romanato. Encoding many channels on the same frequency through radio vorticity: first experimental test. New J. Phys., 14, 033001(2012).

[8] O. Edfors, A. J. Johansson. Is orbital angular momentum (OAM) based radio communication an unexploited area?. IEEE Trans. Antennas Propag., 60, 1126-1131(2012).

[9] X. Hui, S. Zheng, Y. Chen, Y. Hu, X. Jin, H. Chi, X. Zhang. Multiplexed millimeter wave communication with dual orbital angular momentum mode antennas. Sci. Rep., 5, 10148(2015).

[10] Y. Yan, G. Xie, M. P. J. Lavery, H. Huang, N. Ahmed, C. Bao, Y. Ren, Y. Cao, L. Li, Z. Zhao, A. F. Molisch, M. Tur, M. J. Padgett, A. E. Willner. High-capacity millimetre-wave communications with orbital angular momentum multiplexing. Nat. Commun., 5, 4876(2014).

[11] M. P. Lavery, F. C. Speirits, S. M. Barnett, M. J. Padgett. Detection of a spinning object using lights orbital angular momentum. Science, 341, 537-540(2013).

[12] K. Liu, Y. Cheng, Z. Yang, H. Wang, Y. Qin, X. Li. Orbital-angular-momentum-based electromagnetic vortex imaging. IEEE Antennas Wireless Propag. Lett., 14, 711-714(2015).

[13] M. Beijersbergen, R. Coerwinkel, M. Kristensen, J. Woerdman. Helical-wavefront laser beams produced with a spiral phaseplate. Opt. Commun., 112, 321-327(1994).

[14] R. Niemiec, C. Brousseau, K. Mahdjoub, O. Emile, A. Ménard. Characterization of an OAM flat-plate antenna in the millimeter frequency band. IEEE Antennas Wireless Propag. Lett., 13, 1011-1014(2014).

[15] E. Mari, F. Spinello, M. Oldoni, R. A. Ravanelli, F. Romanato, G. Parisi. Near-field experimental verification of separation of OAM channels. IEEE Antennas Wireless Propag. Lett., 14, 556-558(2015).

[16] A. Tennant, B. Allen. Generation of OAM radio waves using circular time-switched array antenna. Electron. Lett., 48, 1365-1366(2012).

[17] S. Zheng, X. Zhang, X. Jin, H. Chi. Orbital angular momentum generation using a circular wire loop antenna. International Photonics and OptoElectronics Meetings, OF3A.1(2014).

[18] S. Zheng, X. Hui, X. Jin, H. Chi, X. Zhang. Generation of OAM millimeter waves using traveling-wave circular slot antenna based on ring resonant cavity. IEEE International Conference on Computational Electromagnetics (ICCEM), 239-240(2015).

[19] W. Zhang, S. Zheng, Y. Chen, X. Jin, H. Chi, X. Zhang. Orbital angular momentum based communications with partial arc sampling receiving. IEEE Commun. Lett., 20, 1381-1384(2016).

[20] S. Zheng, X. Hui, X. Jin, H. Chi, X. Zhang. Transmission characteristics of a twisted radio wave based on circular traveling-wave antenna. IEEE Trans. Antennas Propag., 63, 1530-1536(2015).

[21] D. K. Nguyen, O. Pascal, J. Sokoloff, A. Chabory, B. Palacin, N. Capet. Antenna gain and link budget for waves carrying orbital angular momentum. Radio Sci., 50, 1165-1175(2015).

[22] M. J. Padgett, F. M. Miatto, M. P. Lavery, A. Zeilinger, R. W. Boyd. Divergence of an orbital-angular-momentum-carrying beam upon propagation. New J. Phys., 17, 023011(2015).

[23] C. Sheppard, S. Saghafi. Transverse-electric and transverse-magnetic beam modes beyond the paraxial approximation. Opt. Lett., 24, 1543-1545(1999).