Short-Wavelength Laser Emission Using Ag/Si Core/Shell Nanostructure

In this study, the emission of photoelectrons in hydrogen gas is investigated numerically using near scattered fields. The calculations of these fields performed using Mie theory have been for many years a powerful tool for better understanding the scattering of electromagnetic radiation. Whether in single-layered nanosphere or core-shell metallic nanospheres, the oscillating surface charges concentrate close to the poles of the metal surface, which results in both resonance wavelength shifts and intensity modulation. Also, the near fields around the nanoparticles can be spatiotemporally redistributed and may give a great pulses of typical femtosecond oscillators. Harmonic spectra are influenced by incidence beam wavelength, the particle radius, the shell thickness and the distance between the H atom and the nanosphere. Such laser sources opened the door to real-time observation and time-domain control of atomic-scale electron dynamics, ultrafast spectroscopy and photography, and address the expected implications of having the tools to monitor electrons with sub-atomic resolution in both space and time.