Author Affiliations

R.J.P. Engelen,^(1),* Y. Sugimoto,^(2),(3),(4) Y. Watanabe,⁽⁴⁾ J.P. Korterik,⁽⁵⁾ N. Ikeda,^(2),(3) N.F. van Hulst,^(5),(6) K. Asakawa,^(2),(4) and L. Kuipers^(1),(5)

⁽¹⁾FOM Institute for Atomic and Molecular Physics (AMOLF), Kruislaan 407, 1098SJ Amsterdam, The Netherlands

⁽²⁾The Femtosecond Technology Research Association (FESTA), Tsukuba, 300-2635, Japan

⁽⁵⁾Applied Optics Group, Department of Science & Technology and MESA+ Institute for Nanotechnology, University of Twente, P.O. Box 217, 7500AE Enschede, The Netherlands

⁽³⁾National Institute of Advanced Industrial Science and Technology (AIST), Tsukuba, 305-8561, Japan, at present

⁽⁴⁾TARA Center, University of Tsukuba, Tsukuba, 305-8577, Japan, at present

⁽⁶⁾Institut de Cìencies Fotòniques (ICFO), Av. Canal Olímpic, 08860 Castelldefels, Barcelona, Spain, at present

^*Corresponding author: engelen@amolf.nl