@article {doi:10.1063/5.0005597,
	title = {Enhancing the modal purity of orbital angular momentum photons},
	journal = {APL Photonics},
	volume = {5},
	number = {7},
	year = {2020},
	pages = {070802},
	doi = {10.1063/5.0005597},
	url = {https://doi.org/10.1063/5.0005597},
	author = {Nape, Isaac and Sephton, Bereneice and Yao-Wei Huang and Adam Vall{\'e}s and Cheng-Wei Qiu and Antonio Ambrosio and Federico Capasso and Forbes, Andrew}
}
