Avner Fleischer

Learn More
Circularly-polarized extreme ultraviolet and X-ray radiation is useful for analysing the structural, electronic and magnetic properties of materials. To date, such radiation has only been available at large-scale X-ray facilities such as synchrotrons. Here, we demonstrate the first bright, phase-matched, extreme ultraviolet circularly-polarized high(More)
We demonstrate experimentally sparsity-based super-resolution of coherent diffraction imaging (CDI) with extreme UV radiation. We also present the first experimental CDI of a practically one-dimensional object, overcoming the well-known ambiguity problem in one-dimensional phase retrieval. Phase retrieval problems arise in many optical applications,(More)
Phase-retrieval problems of one-dimensional (1D) signals are known to suffer from ambiguity that hampers their recovery from measurements of their Fourier magnitude, even when their support (a region that confines the signal) is known. Here we demonstrate sparsity-based coherent diffraction imaging of 1D objects using extreme-ultraviolet radiation produced(More)
Strong-field ionization provides fundamental insight into light-matter interactions, encoding the structure of atoms and molecules on the subångström and subfemtosecond scales. In this Rapid Communication, we explore an important regime: strong-field ionization by two-color circularly polarized laser fields. In contrast to past work using linearly polarized(More)
We predict and investigate the emission of high-order harmonics by atoms that cross intense laser hot spots that last for a nanosecond or longer. An atom that moves through a nanometer-scale hot spot at characteristic thermal velocity can emit high-order harmonics in a similar fashion to an atom that is irradiated by a short-duration (picosecond-scale)(More)
Working with Profs. Henry Kapteyn and Margaret Murnane, I use femtoseond Ti:sapphire lasers to study the dynamics of molecules and nanomaterials on the femtosecond timescale. My thesis centers on extending Velocity Map Imaging (VMI) spectroscopy to nanomaterials and extreme-ultraviolet (EUV) wavelengths. I used NMR spectoscopy and computational chemistry to(More)
  • 1