1. School of Physics and AMBERTrinity College Dublin Dublin 2 Ireland
2. Department of Electrical Engineering and Solid‐State InstituteTechnion—Israel Institute of Technology Haifa 32000 Israel
3. School of Chemistry and AMBERTrinity College Dublin Dublin 2 Ireland
4. Institute of PhysicsEIT 2Faculty of Electrical Engineering and Information TechnologyUniversität der Bundeswehr München Werner‐Heisenberg‐Weg 39 85577 Neubiberg Germany
5. Laboratory of Micro‐Nano Photonic and Optoelectronic Materials and DevicesKey Laboratory of Materials for High‐Power LaserShanghai Institute of Optics and Fine MechanicsChinese Academy of Sciences & CAS Center for Excellence in Ultra‐intense Laser Science Shanghai 201800 P. R. China