Li, Peining http://orcid.org/0000-0003-3836-3803
Hu, Guangwei http://orcid.org/0000-0002-3023-9632
Dolado, Irene
Tymchenko, Mykhailo
Qiu, Cheng-Wei http://orcid.org/0000-0002-6605-500X
Alfaro-Mozaz, Francisco Javier
Casanova, Fèlix http://orcid.org/0000-0003-0316-2163
Hueso, Luis E. http://orcid.org/0000-0002-7918-8047
Liu, Song http://orcid.org/0000-0002-3046-3335
Edgar, James H. http://orcid.org/0000-0003-0918-5964
Vélez, Saül http://orcid.org/0000-0002-0019-2271
Alu, Andrea http://orcid.org/0000-0002-4297-5274
Hillenbrand, Rainer http://orcid.org/0000-0002-1904-4551
Article History
Received: 9 January 2020
Accepted: 22 June 2020
First Online: 21 July 2020
Competing interests
: R.H. is co-founder of Neaspec GmbH, a company producing scattering-type scanning near-field optical microscope systems, such as the one used in this study. The remaining authors declare no competing interests.