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  • Jing, Liqiao  (4)
  • Shen, Lian  (4)
  • Xu, Su  (4)
  • English  (4)
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  • English  (4)
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  • 1
    Online Resource
    Online Resource
    Spiral Field Generation in Smith-Purcell Radiation by Helical Metagratings
    American Association for the Advancement of Science (AAAS) ; 2019
    In:  Research Vol. 2019 ( 2019-01)
    Details
    In: Research, American Association for the Advancement of Science (AAAS), Vol. 2019 ( 2019-01)
    Abstract: Moving electrons interacting with media can give rise to electromagnetic radiations and has been emerged as a promising platform for particle detection, spectroscopies, and free-electron lasers. In this letter, we investigate the Smith-Purcell radiation from helical metagratings, chiral structures similar to deoxyribonucleic acid (DNA), in order to understand the interplay between electrons, photons, and object chirality. Spiral field patterns can be generated while introducing a gradient azimuthal phase distribution to the induced electric dipole array at the cylindrical interface. Experimental measurements show efficient control over angular momentum of the radiated field at microwave regime, utilizing a phased electromagnetic dipole array to mimic moving charged particles. The angular momentum of the radiated wave is determined solely by the handedness of the helical structure, and it thus serves as a potential candidate for the detection of chiral objects. Our findings not only pave a way for design of orbital angular momentum free-electron lasers but also provide a platform to study the interplay between swift electrons with chiral objects.
    Type of Medium: Online Resource
    ISSN: 2639-5274
    URL: Article
    DOI: 10.34133/2019/3806132
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2019
    detail.hit.zdb_id: 2949955-0
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  • 2
    Online Resource
    Online Resource
    Spiral Field Generation in Smith-Purcell Radiation by Helical Metagratings
    American Association for the Advancement of Science (AAAS) ; 2019
    In:  Research Vol. 2019 ( 2019-02-27), p. 1-8
    Details
    In: Research, American Association for the Advancement of Science (AAAS), Vol. 2019 ( 2019-02-27), p. 1-8
    Abstract: Moving electrons interacting with media can give rise to electromagnetic radiations and has been emerged as a promising platform for particle detection, spectroscopies, and free-electron lasers. In this letter, we investigate the Smith-Purcell radiation from helical metagratings, chiral structures similar to deoxyribonucleic acid (DNA), in order to understand the interplay between electrons, photons, and object chirality. Spiral field patterns can be generated while introducing a gradient azimuthal phase distribution to the induced electric dipole array at the cylindrical interface. Experimental measurements show efficient control over angular momentum of the radiated field at microwave regime, utilizing a phased electromagnetic dipole array to mimic moving charged particles. The angular momentum of the radiated wave is determined solely by the handedness of the helical structure, and it thus serves as a potential candidate for the detection of chiral objects. Our findings not only pave a way for design of orbital angular momentum free-electron lasers but also provide a platform to study the interplay between swift electrons with chiral objects.
    Type of Medium: Online Resource
    ISSN: 2639-5274
    URL: Article
    DOI: 10.1155/2019/3806132
    Language: English
    Publisher: American Association for the Advancement of Science (AAAS)
    Publication Date: 2019
    detail.hit.zdb_id: 2949955-0
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  • 3
    Online Resource
    Online Resource
    Angular‐Adaptive Spin‐Locked Retroreflector Based on Reconfigurable Magnetic Metagrating
    Wiley ; 2019
    In:  Advanced Optical Materials Vol. 7, No. 13 ( 2019-07)
    Details
    In: Advanced Optical Materials, Wiley, Vol. 7, No. 13 ( 2019-07)
    Abstract: Retroreflectors made of gradient metasurfaces have recently attracted intense interests due to their ability in reflecting incident light back to its source. So far, the current retroreflectors can only flip the transverse momenta of incident photons in specific incidence angles and thus have limitations in wide‐angle applications. Here, a switchable metagrating based retroreflector is proposed for high‐efficient spin‐locked retroreflection and suppression of undesired diffractions. Upon reflection, the handedness of the waves is kept the same as the incidence. Furthermore, by mechanically altering the folding state of the reconfigurable retroreflector, adaptive tangential momenta could be imparted to the incidence photons, providing a high‐performance retroreflection over a continuous range of incidence angles from 27.3° to 52.5°. As a proof of concept, a magnetic metagrating based retroreflector is fabricated at microwave frequencies and experimental measurements show consistent behaviors at various incidence angles. The proposed retroreflector is compact (overall thickness of 0.204 of the wavelength) and inherently insensitive to the illumination angle. As the design concept introduced in the paper could be extended to terahertz and optical frequencies, the design may serve as a promising platform toward reconfigurable spin‐based retroreflection devices for not only interface electromagnetics but also ultraflat photonics.
    Type of Medium: Online Resource
    ISSN: 2195-1071 , 2195-1071
    URL: Issue
    URL: Article
    DOI: 10.1002/adom.v7.13
    DOI: 10.1002/adom.201900151
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2708158-8
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  • 4
    Online Resource
    Online Resource
    Origami Metawall: Mechanically Controlled Absorption and Deflection of Light
    Wiley ; 2019
    In:  Advanced Science Vol. 6, No. 23 ( 2019-12)
    Details
    In: Advanced Science, Wiley, Vol. 6, No. 23 ( 2019-12)
    Abstract: Metamaterials/metasurfaces, which have subwavelength resonating unit cells (i.e., meta‐atoms), can enable unprecedented control over the flow of light. Despite their significant progress, achieving dynamical control of both energy and momentum of light remains a challenge. Here, a mechanically tunable metawall capable of either absorbing light energy or modulating light momentum, by incorporating the magnetic meta‐atoms into a 3D printed origami grating, is theoretically designed and experimentally realized. Through mechanical stretching or compressing of the Miura‐ori pattern, the function of metawall can transit from an absorber, a mirror, to a negative reflector. Particularly, the continuously geometric deformation of the Miura‐ori lattice is a promising approach to compensate the angular dispersion in gradient metasurfaces. Considering the prominent mechanical properties and strong deformation abilities of origami structures, the findings may open an alternative avenue toward lightweight and deployable metadevices with diversified and continuously alterable electromagnetic properties.
    Type of Medium: Online Resource
    ISSN: 2198-3844 , 2198-3844
    URL: Issue
    URL: Article
    DOI: 10.1002/advs.v6.23
    DOI: 10.1002/advs.201901434
    Language: English
    Publisher: Wiley
    Publication Date: 2019
    detail.hit.zdb_id: 2808093-2
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