The Fano line shape,arising from the interference of pathways for the excitation of discrete and continuum states,plays a fundamental role in many branches of physics,chemistry,and materials science.Exciting the reson...The Fano line shape,arising from the interference of pathways for the excitation of discrete and continuum states,plays a fundamental role in many branches of physics,chemistry,and materials science.Exciting the resonance with a high harmonic provides naturally a phase delay between the pathways leading to a complex asymmetry parameter.We demonstrate that its amplitude and phase can be controlled on the femtosecond and attosecond time scales,respectively.With our high-energy-resolution(10-meV)experiment,we dynamically image a resonance-enhanced electron wave packet during its temporal evolution,extracting both the amplitude and the phase.Calculations reproduce our experimental results.Our approach constitutes a method for measuring the photoionization delays of a resonance and enables the reconstruction of the electron wave packet in the time domain.This concept of an interferencecontrolled Fano line shape is a step toward attosecond quantum optics with potential ramifications into nanoscience and next-generation optical materials.展开更多
基金funding from the European Union’s Horizon 2020 research and innovation program under the Marie Skłodowska-Curie grant agreement no.801459-FP-RESOMUSfunding by the Chemical Sciences,Geosciences and Biosciences Division,Office of Basic Energy Sciences,Office of Science,US Department of Energy,grant no.DE-FG02-86ER13491supported by ETH Zurich and the Swiss National Science Foundation through projects 200021_172946 and the NCCR-MUST.
文摘The Fano line shape,arising from the interference of pathways for the excitation of discrete and continuum states,plays a fundamental role in many branches of physics,chemistry,and materials science.Exciting the resonance with a high harmonic provides naturally a phase delay between the pathways leading to a complex asymmetry parameter.We demonstrate that its amplitude and phase can be controlled on the femtosecond and attosecond time scales,respectively.With our high-energy-resolution(10-meV)experiment,we dynamically image a resonance-enhanced electron wave packet during its temporal evolution,extracting both the amplitude and the phase.Calculations reproduce our experimental results.Our approach constitutes a method for measuring the photoionization delays of a resonance and enables the reconstruction of the electron wave packet in the time domain.This concept of an interferencecontrolled Fano line shape is a step toward attosecond quantum optics with potential ramifications into nanoscience and next-generation optical materials.
