@article{Chen2018, author = "Songtao Chen and Arto Nurmikko", title = "{3545458.pdf}", year = "2018", month = "9", url = "https://opticapublishing.figshare.com/articles/journal_contribution/3545458_pdf/7017164", doi = "10.6084/m9.figshare.7017164.v1" }