Atomic, Molecular, Optical Science

AMOS encompasses the research in
atomic, molecular, and optical science
at the Weizmann Institute of Science.

AMOS Research Areas

AMOS is a center for quantum physics with atomic, molecular, and optical systems, at the Weizmann Institute of Science. The center includes 15 research groups and activities ranging across most contemporary topics in AMO physics - from atto-second pulses and intense lasers, through precision spectroscopy of ultracold atoms, molecules or ions, to quantum information and quantum optics. AMOS members hold faculty appointments in both the Physics and Chemistry Faculties at the Weizmann Institute of Science.

A wide range of interests and scientific excellence contribute to making AMOS one of Israel's leading research centers. AMOS scientists publish annually numerous scientific manuscripts in leading journals.

News

  • Date: December 2, 2025

    Optica

  • Date: January 15, 2025

    2024 Tenne Family Prize

  • Date: June 16, 2024

    Morris L. Levinson Prize in Physics

All News

Seminars

  • Date:
    03
    Mar 2026
    13:15

    **CANCELED** Superresolved CARS by coherent image scanning

    Speakers
    Prof. Dan Oron

    Superresolution microscopy has transformed many life science imaging applications. Yet, a similar advance towards breaking the resolution barrier in coherent nonlinear microscopy is yet to occur. Here we present the implementation of image scanning microscopy (ISM) to coherent anti-Stokes Raman imaging, showing a significant resolution enhancement. In ISM, a pixelated detector serves as the pinhole in confocal microscopy, whereby the excitation spot is magnified such that every pixel acts as a small pinhole. Signals collected from multiple pixels are then analysed to generate a higher resolution image. The difficulty in applying ISM to coherent imaging is that the analysis process requires exact knowledge not only of the amplitude of the signal but also its phase. We implement CARS-ISM using nearly inline interferometry, whereby a reference signal is generated in a glass slide and is directed towards the sample along with the pump and stokes beams. Dispersion compensation and phase stepping of the reference beam is done in a 4f pulse shaper inserted between the generation of the reference and the sample. Using this system, we obtain superresolved CARS images in the lipid C-H stretch band when using pump and Stokes beams generated by a Ti:Sapphire laser and a synchronously pumped OPO. Importantly, the phase of the CARS signal is spatially variant due to the different rations of resonant and nonresonant contributions. To further characterize the resolution enhancement we use polymer air-force like grating targets which show that the use of ISM can lead to a ~1.5 times better resolution even without advanced image processing, and holds the potential for further resolution increase. The potential of this technique as a general-purpose booster of resolution in coherent nonlinear microscopy and possible implementations in epi-detection mode will also be discussed.

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Publications

  • Sensing Single-Molecule Magnets with Nitrogen-Vacancy Centers

    Smooha A., Kumar J., Yudilevich D., Rosenberg J. W., Bayer V., Stöhr R., Denisenko A., Bendikov T., Kossoy A., Pinkas I., Tan H., Yan B., Sarkar B., van Slageren J. & Finkler A. (2026) Nano Letters.
    Single-molecule magnets (SMMs) are molecules that can function as nanoscale magnets with potential use as magnetic memory bits. While SMMs can retain magnetization at low temperatures, characterizing them on surfaces and at room temperature remains challenging and requires specialized nanoscale techniques. Here, we use single nitrogen-vacancy (NV) centers in diamond as a highly sensitive, broadband magnetic field sensor to detect the magnetic noise of cobalt-based SMMs deposited on a diamond surface. We measured the NV relaxation and decoherence times at 296 K and at 5-8 K, observing a significant influence of the SMMs on them. From this, we infer the SMMs' magnetic noise spectral density (NSD) and underlying magnetic properties. Moreover, we observe the effect of an applied magnetic field on the SMMs' NSD at low temperatures. The method provides nanoscale sensitivity for characterizing SMMs under realistic conditions relevant to their use as surface-bound memory units.
  • Unraveling Size Dependent Bi- and Tri-Exciton Characteristics in CdSe/CdS Core/Shell Quantum Dots via Ensemble Time Gated Heralded Spectroscopy

    Scharf E., Liran R., Levi A., Alon O., Chefetz N., Oron D. & Banin U. (2026) Small.
    Multiexcitons in quantum dots (QDs) manifest many-body interactions under quantum confinement and are significant in numerous optoelectronic and quantum applications. Yet, the strong interactions between multiexcitons leading to rapid non-radiative Auger decay introduce challenges for their characterization. While so far, the measurement techniques rely either on indirect methods or on single particle studies, herein a new method is introduced to study multiexcitons in QD ensembles utilizing spectrally resolved time-gated heralded spectroscopy. With this approach, the biexciton binding energies is extracted in CdSe/CdS QD ensembles of several core/shell sizes, manifesting a transition between attractive to repulsive exciton-exciton interactions. Additionally, for triexcitons, involving occupation of two excitons in the 1s energy levels and one exciton in the 1p energy levels, the open issues of extracting the lifetime, the spectra of the two triexciton pathways and their branching ratio are resolved. The ensemble measurements provide high photon counts and low noise levels, and alongside the time-gated heralded approach, thus enable the observation of multiexciton characteristics that are often obscured in single particle studies. The approach can be further implemented in the characterization of the energies and lifetimes of multiexcitons in other QD systems to enable rapid characterization and understanding.