Atoms can be individually captured and guided by light through optical dipole-trapping. However, applying this to many
atoms simultaneously has been difficult due to the low inertia of atoms. Recently dynamically-controlled laser beams
achieved such demonstrations, enabling a bottom-up approach to form arbitrary atom lattices, deterministic atom loading,
atom-sorting, and even single-atom-level machinery. Here we report the latest improvements of the single-atom-level
dynamic holographic optical tweezers. With the hardware and software upgrades to be explained in the text, the overall
performance has improved to form arbitrary 2D lattices of a size about N=20, with success probability exceeding 50%.
Inverse scattering refers the retrieval of the unknown constitutive parameters from measured scattered wave
fields, and has many applications such as ultrasound imaging, optics, T-ray imaging, radar, and etc. Two
distinct imaging strategies have been commonly used: narrow band inverse scattering approaches using a large
number of transmitters and receivers, or wideband imaging approaches with smaller number of transmitters and
receivers. In some biomedical imaging applications, the limited accessibility of scattered fields using externally
located antenna arrays usually prefers the wideband imaging approaches. The main contribution of this paper is,
therefore, to analyze the wideband inverse scattering problem from compressive sensing perspective. Specifically,
the mutual coherence of the wideband imaging geometry is analyzed, which reveals a significant advantage to
identify the sparse targets from very limited number of measurements.
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