Yoxall, Edward http://orcid.org/0000-0001-7375-9200
Schnell, Martin
Nikitin, Alexey Y. http://orcid.org/0000-0002-2327-0164
Txoperena, Oihana
Woessner, Achim http://orcid.org/0000-0002-5024-4201
Lundeberg, Mark B.
Casanova, FĂ©lix
Hueso, Luis E. http://orcid.org/0000-0002-7918-8047
Koppens, Frank H. L.
Hillenbrand, Rainer
Article History
Received: 30 April 2015
Accepted: 3 August 2015
First Online: 14 September 2015
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. All other authors declare no competing financial interests.