Competition of single and double rescattering in the strong-field photoemission from dielectric nanospheres

• DOI: 10.1007/s00340-016-6369-0
• Publication Date: 2016-04-14T07:49:43Z
• Authors: L. Seiffert; F. Süßmann; S. Zherebtsov; P. Rupp; C. Peltz; E. Rühl; M. F. Kling; T. Fennel
• Keywords: Carrier-envelope phase; Semiclassical physics; Above threshold ionization; Envelope (radar)

Nanostructures exposed to ultrashort waveform-controlled laser pulses enable the generation of enhanced and highly localized near fields with adjustable local electric field evolution. Here, we study dielectric SiO2 nanospheres (d = 100–700 nm) under strong carrier-envelope phase-controlled few-cycle perform a systematic theoretical analysis resulting near-field driven photoemission. In particular, analyze impacts charge interaction ellipticity on electron acceleration. Our semiclassical transport simulations predict quenching emission energies due ionization induced space charge. Though single surface backscattering remains main process for considered parameter range, find substantial contribution double rescattering that increases sphere size becomes dominant cutoff energy largest investigated spheres. The growing importance recollision is traced back increasing via trajectory corresponding initial final state correlation. Finally, compare phase-dependent electrons both exhibit characteristic directional switching behavior.