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  1. Article ; Online: Meta-holograms under incoherent illumination: image properties and spackle pattern.

    Baum, Yehuda / Scheuer, Jacob

    Optics express

    2023  Volume 31, Issue 22, Page(s) 36981–36991

    Abstract: We study the properties of the images projected by meta-holograms under broadband incoherent/polychromatic illumination. We show that despite the broadband illumination, some of the coherent properties of the images such as the speckle pattern are ... ...

    Abstract We study the properties of the images projected by meta-holograms under broadband incoherent/polychromatic illumination. We show that despite the broadband illumination, some of the coherent properties of the images such as the speckle pattern are retained even for sources with bandwidth of 20 nm. We study the projected images and their speckle pattern properties under various illumination spectra using a set of monochromatic images obtained at different wavelengths.
    Language English
    Publishing date 2023-11-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.497912
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: White light cavity formation and superluminal lasing near exceptional points.

    Scheuer, Jacob

    Optics express

    2019  Volume 26, Issue 24, Page(s) 32091–32102

    Abstract: We study theoretically a superluminal laser system comprising active and passive (lossy) coupled micro-resonators with equal gain/loss. It is shown that when the system satisfies the white light cavity (WLC) condition, corresponding to zero group index, ... ...

    Abstract We study theoretically a superluminal laser system comprising active and passive (lossy) coupled micro-resonators with equal gain/loss. It is shown that when the system satisfies the white light cavity (WLC) condition, corresponding to zero group index, it also forms a PT-symmetric system (PTSS) at its exceptional point (EP). Slightly above lasing threshold, in the broken symmetry regime near the EP, the system exhibits "superluminal" lasing - a unique lasing condition which is highly attractive for sensing and precision metrology applications. It is also shown that some of the latest experimental studies involving PTSSs have indirectly demonstrated such superluminal lasing.
    Language English
    Publishing date 2019-01-16
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.26.032091
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Optimal interfacing with coupled-cavities slow-light waveguides: mimicking periodic structures with a compact device.

    Scheuer, Jacob

    Optics express

    2017  Volume 25, Issue 14, Page(s) 16260–16273

    Abstract: We present a design for optimal interfacing (I/O coupling) with slow-light structures consisting of coupled cavities. The I/O couplers are based on adding a small set of cavities with varying coupling coefficients at edges of the coupled cavities ... ...

    Abstract We present a design for optimal interfacing (I/O coupling) with slow-light structures consisting of coupled cavities. The I/O couplers are based on adding a small set of cavities with varying coupling coefficients at edges of the coupled cavities waveguide in order to match its impedance with that of the I/O waveguides. I/O efficiencies exceeding 99.9% are shown to be possible over a bandwidth which is larger than 50% of that of the coupled cavities waveguide. Consequently, the reflections at the edges of the slow-light structure are practically eliminated. We discuss the properties of the perfectly impedance matched slow-light structure as an effective (super-structure) cavity and study the impact of the number of cavities comprising the I/O coupler. We also consider in details the impact of errors and disorder in the I/O coupling sections.
    Language English
    Publishing date 2017-07-10
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.25.016260
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Single-pumped gain profile for a superluminal ring laser.

    Sternfeld, Yael / Zhou, Zifan / Shahriar, M S / Scheuer, Jacob

    Optics express

    2023  Volume 31, Issue 22, Page(s) 36952–36965

    Abstract: We present an approach for realizing a superluminal ring laser using a single isotope of atomic Rb vapor by producing electromagnetically induced transparency (EIT) in self-pumped Raman gain. Only a single pump laser is used for generating a Raman gain ... ...

    Abstract We present an approach for realizing a superluminal ring laser using a single isotope of atomic Rb vapor by producing electromagnetically induced transparency (EIT) in self-pumped Raman gain. Only a single pump laser is used for generating a Raman gain profile containing a dip at its center. The position and depth of this dip can be tuned by adjusting the intensity of the pump laser, allowing for optimizing the degree of enhancement in sensitivity within a certain operating range. This approach represents a significant simplification of the design of superluminal lasers compared to the approaches demonstrated in previous studies. We demonstrate experimentally the realization of this scheme using transitions within the D1 and the D2 manifolds of
    Language English
    Publishing date 2023-11-28
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.497073
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  5. Article ; Online: Extraordinary broadband impedance matching in highly dispersive media - the white light cavity approach.

    Scheuer, Jacob / Filonov, Dmitry / Vosheva, Tatyana / Ginzburg, Pavel

    Optics express

    2022  Volume 30, Issue 4, Page(s) 5192–5199

    Abstract: Suppressing reflections from material boundaries has always been an objective, common to many disciplines, where wave phenomena play a role. While impedance difference between materials necessarily leads to a wave reflection, introducing matching ... ...

    Abstract Suppressing reflections from material boundaries has always been an objective, common to many disciplines, where wave phenomena play a role. While impedance difference between materials necessarily leads to a wave reflection, introducing matching elements can almost completely suppress this phenomenon. However, many impedance matching approaches are based on resonant conditions, which come at a price of narrow bandwidth operation. Although various impedance matching architectures have been developed in the past, many of them fail to produce a broadband and flat (ripple-free) transmission, particularly in the presence of strong chromatic dispersion. Here we propose and demonstrate an approach for designing an optimal matching stack capable of providing a flat broadband transmission even in the presence of significant group velocity dispersion. As an experimental example for the method verification, we used a strong modal dispersion in a rectangular waveguide, operating close to a mode cut-off. The waveguide core consists of alternating polymer sections with a variable filling factor, realized using additive manufacturing. As a result, a broadband matching in the range of 7-8GHz was demonstrated and proved to significantly outperform the standard binomial transformer solution. The proposed method can find use across different disciplines, including optics, acoustics and wireless communications, where undesired reflections can significantly degrade system's performances.
    Language English
    Publishing date 2022-02-21
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.443214
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  6. Article ; Online: Training for the 21st century?

    Scheuer, James

    Annals of internal medicine

    2014  Volume 161, Issue 10, Page(s) 760–761

    MeSH term(s) Accreditation/methods ; Clinical Competence/standards ; Education, Medical, Graduate/standards ; Internal Medicine/education
    Language English
    Publishing date 2014-11-18
    Publishing country United States
    Document type Comment ; Letter
    ZDB-ID 336-0
    ISSN 1539-3704 ; 0003-4819
    ISSN (online) 1539-3704
    ISSN 0003-4819
    DOI 10.7326/L14-5023-2
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Ua VI Zs.178/2: Show issues Location:
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    bis Jg. 2021: Bestellungen von Artikeln über das Online-Bestellformular
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  7. Article ; Online: High efficiency coupling to metal-insulator-metal plasmonic waveguides.

    Blau, Yoav / Gilad, Timor / Hanein, Yael / Boag, Amir / Scheuer, Jacob

    Optics express

    2022  Volume 30, Issue 8, Page(s) 13757–13764

    Abstract: A periodic array of dual-Vivaldi antennas integrated with metal-insulator-metal (MIM) plasmonic waveguides was designed and investigated for its infrared light absorbance efficiency. Full-wave analysis was used to optimize MIM waveguides compatible with ... ...

    Abstract A periodic array of dual-Vivaldi antennas integrated with metal-insulator-metal (MIM) plasmonic waveguides was designed and investigated for its infrared light absorbance efficiency. Full-wave analysis was used to optimize MIM waveguides compatible with parallel and series connected DC leads without sacrificing radiation efficiency. Free-space to MIM waveguide in-coupling efficiency as high as 41% has been obtained in a sub-wavelength unit cell geometry at a wavelength of 1373 nm. Higher efficiency, up to 85%, is predicted with a modified design including a backplane reflector. A nanofabrication process was developed to realize test devices and far-field optical spectroscopy was used as experimental evidence for antenna-waveguide matching.
    Language English
    Publishing date 2022-04-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.453240
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  8. Article ; Online: Neural networks enabled forward and inverse design of reconfigurable metasurfaces.

    Tanriover, Ibrahim / Hadibrata, Wisnu / Scheuer, Jacob / Aydin, Koray

    Optics express

    2021  Volume 29, Issue 17, Page(s) 27219–27227

    Abstract: Nanophotonics has joined the application areas of deep neural networks (DNNs) in recent years. Various network architectures and learning approaches have been employed to design and simulate nanophotonic structures and devices. Design and simulation of ... ...

    Abstract Nanophotonics has joined the application areas of deep neural networks (DNNs) in recent years. Various network architectures and learning approaches have been employed to design and simulate nanophotonic structures and devices. Design and simulation of reconfigurable metasurfaces is another promising application area for neural network enabled nanophotonic design. The tunable optical response of these metasurfaces rely on the phase transitions of phase-change materials, which correspond to significant changes in their dielectric permittivity. Consequently, simulation and design of these metasurfaces requires the ability to model a diverse span of optical properties. In this work, to realize forward and inverse design of reconfigurable metasurfaces, we construct forward and inverse networks to model a wide range of optical characteristics covering from lossless dielectric to lossy plasmonic materials. As proof-of-concept demonstrations, we design a Ge
    Language English
    Publishing date 2021-10-06
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.430704
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  9. Article ; Online: Demonstration of a superluminal laser using electromagnetically induced transparency in Raman gain.

    Zhou, Zifan / Zhu, Ruoxi / Sternfeld, Yael / Scheuer, Jacob / Bonacum, Jason / Shahriar, Selim M

    Optics express

    2023  Volume 31, Issue 9, Page(s) 14377–14388

    Abstract: We report the realization of a superluminal laser in which the dip in the gain profile necessary for anomalous dispersion is produced via electromagnetically induced transparency caused by the optical pumping laser. This laser also creates the ground ... ...

    Abstract We report the realization of a superluminal laser in which the dip in the gain profile necessary for anomalous dispersion is produced via electromagnetically induced transparency caused by the optical pumping laser. This laser also creates the ground state population inversion necessary for generating Raman gain. Compared to a conventional Raman laser with similar operating parameters but without the dip in the gain profile, the spectral sensitivity of this approach is explicitly demonstrated to be enhanced by a factor of ∼12.7. Compared to an empty cavity, the peak value of the sensitivity enhancement factor under optimal operation parameters is inferred to be ∼360.
    Language English
    Publishing date 2023-05-08
    Publishing country United States
    Document type Journal Article
    ZDB-ID 1491859-6
    ISSN 1094-4087 ; 1094-4087
    ISSN (online) 1094-4087
    ISSN 1094-4087
    DOI 10.1364/OE.486083
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  10. Article ; Online: The relationship between proceduralization and cognitive control.

    Marton, Klara / Scheuer, Jessica

    Journal of communication disorders

    2019  Volume 83, Page(s) 105941

    Abstract: In this paper we discuss the relationship between the proceduralization process and cognitive control. Our discussion is based on theoretical models and clinical practices, with a focus on child language impairment. We argue that the same skill may ... ...

    Abstract In this paper we discuss the relationship between the proceduralization process and cognitive control. Our discussion is based on theoretical models and clinical practices, with a focus on child language impairment. We argue that the same skill may require more or less cognitive control depending on the differences in contextual conditions.
    MeSH term(s) Child ; Cognition ; Humans ; Language Disorders
    Language English
    Publishing date 2019-09-26
    Publishing country United States
    Document type Journal Article
    ZDB-ID 3011-9
    ISSN 1873-7994 ; 0021-9924
    ISSN (online) 1873-7994
    ISSN 0021-9924
    DOI 10.1016/j.jcomdis.2019.105941
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    In stock of ZB MED Cologne/Königswinter

    Zs.A 590: Show issues Location:
    Je nach Verfügbarkeit (siehe Angabe bei Bestand)
    bis Jg. 1994: Bestellungen von Artikeln über das Online-Bestellformular
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