Paper 12995-3
Paper 12995-3
Isotropic sub-100nm direct laser writing using spherical reflector-enabled 4Pi excitation at 405nm wavelength
8 April 2024 • 12:20 - 12:40 CEST | Londres 2/Salon 7, Niveau/Level 0
Abstract
We demonstrate a direct laser writing setup combining 405 nm multi-photon lithography with 4Pi excitation enabled by a spherical reflector (SR) refocussing the transmitted excitation. The SR provides a simplified implementation of the 4Pi geometry, avoiding the need for an additional objective and its interferometrically stabilised excitation beam path, while also recycling the beam power. The reflected beam position is measured by imaging the reflected beam and is controlled by a feedback loop to 10nm in all three dimensions. Using this instrument, the fabrication of sinusoidally modulated nanowires and helicoids with sub-100nm near-isotropic cross-section is demonstrated.
Presenter
Cardiff Univ. (United Kingdom)
Wolfgang Langbein received his PhD in Physics from the University of Karlsruhe in 1995. He was assistant research professor at the Mikroelektronik Centret, Denmark up to 1998, then moved to the University of Dortmund, where he received his Habilitation in 2003. In 2004 he was appointed senior lecturer in the School of Physics, Cardiff University, promoted to Reader in 2006 and to Personal Chair in 2007. His research interests are characterization and ultrafast spectroscopy of nanostructures, applications of optical spectroscopy and imaging to life-sciences, and electrodynamics and quantum photonics. He has more than 300 publications and 15000 citations.