Transformation optics articles within Nature Communications

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  • Article
    | Open Access

    While great progress has been made in object recognition, implementing them is typically based on conventional electronic hardware. Here the authors introduce a concept of neuro-metamaterials that enable a dynamic entirely-optical object recognition and mirage.

    • Chao Qian
    • , Zhedong Wang
    •  & Hongsheng Chen

  • Article
    | Open Access

    A double-layer lens consists of a first gradient-index/geodesic profile in an upper waveguide, partially surrounded by a mirror that reflects the wave into a lower guide where there is a second profile. A family of such lens profiles are derived.

    • Qiao Chen
    • , Simon A. R. Horsley
    •  & Oscar Quevedo–Teruel

  • Article
    | Open Access

    Wave packets can travel faster than the speed of light only under severe constraints on their bandwidth and propagation distance. The authors demonstrate stringent bounds for superluminal propagation, and their implications for various technologies.

    • Robert Duggan
    • , Hady Moussa
    •  & Andrea Alù

  • Article
    | Open Access

    The authors demonstrate broadband and efficient radio-transparent antennas based on cloaking technology. Their features are well suited for modern communication systems, as closely spaced antennas need to be integrated with minimal interference.

    • Jason Soric
    • , Younes Ra’di
    •  & Andrea Alù

  • Article
    | Open Access

    Visualizing and studying topological features is becoming crucial to develop new generation topological systems. Here the authors provide the theoretical and numerical demonstration of the potential of transformation optics connecting the virtual space to the physical space of lower dimension via conformal mapping.

    • Lizhen Lu
    • , Kun Ding
    •  & J. B. Pendry

  • Article
    | Open Access

    Beam shaping methods can generate optical fields with nontrivial topologies, which are invariant against perturbations and thus interesting for information encoding. Here, the authors introduce the realization of framed optical knots to encode programs with the conjoined use of prime factorization.

    • Hugo Larocque
    • , Alessio D’Errico
    •  & Ebrahim Karimi

  • Article
    | Open Access

    Three-dimensional invisibility cloaks are either limited in bandwidth or disregard the phase of the impinging wave or work only in specific directions. Here, the authors report that these restrictions can be lifted by using cloaks made of fast-light media where the wave group velocity is larger than the speed of light in vacuum.

    • K. L. Tsakmakidis
    • , O. Reshef
    •  & H. Altug

  • Article
    | Open Access

    In optics, schemes have been proposed to realize synthetic gauge fields, but are restricted to the Abelian type. Here, the authors demonstrate synthetic SU(2) non-Abelian gauge fields in anisotropic media, which allows the study of novel optical phenomena not found in Abelian synthetic gauge field systems.

    • Yuntian Chen
    • , Ruo-Yang Zhang
    •  & C. T. Chan

  • Article
    | Open Access

    Flow of electricity between two electrodes can be tuned by monolayers of organic compounds. Here, Pourhossein et al. show that the tunnelling current of such molecular junctions can be modulated rapidly by illumination, using nanoskived gold wires separated by a self-assembled monolayer of hemicyanine dyes.

    • Parisa Pourhossein
    • , Ratheesh K. Vijayaraghavan
    •  & Ryan C. Chiechi

  • Article
    | Open Access

    Wavefront shaping is typically carried out outside the medium within which the beam is propagating. Sheng et al.exploit concepts inspired by General Relativity for wavefront shaping within optical waveguide settings, constructing narrow collimated beams and shape-preserving beams accelerating on arbitrary trajectories

    • Chong Sheng
    • , Rivka Bekenstein
    •  & Mordechai Segev

  • Article
    | Open Access

    Photons emitted from a quantum dot typically have slightly different frequencies owing to various sources of noise. Here, the authors suppress the noise, notably the noise arising from the nuclear spins, and demonstrate single-photon emission with a transform-limited optical linewidth.

    • Andreas V. Kuhlmann
    • , Jonathan H. Prechtel
    •  & Richard J. Warburton

  • Article
    | Open Access

    Conventional optical imaging systems are limited in resolution by the decay of the evanescent wave carrying fine feature information. Here, Cang et al.propose an adiabatic lens that allows far-field optical systems to project an image of near-field features and achieve sub-50 nm imaging resolution in the visible.

    • Hu Cang
    • , Alessandro Salandrino
    •  & Xiang Zhang

  • Article |

    Integrated photonic devices rely on single-mode waveguides, as inter-mode coupling prevents multimode waveguides from being efficiently bent for on-chip schemes. Using transformation optics, Gabrielliet al. overcome this limitation and show a multimode waveguide bend with minimal inter-mode coupling.

    • Lucas H. Gabrielli
    • , David Liu
    •  & Michal Lipson

  • Article |

    Metamaterial cloaks can manipulate light to effectively hide objects from view, but they mostly rely on rigid structures that are tailored specifically for the chosen object. Shin et al.demonstrate an elastic, smart metamaterial cloak that can adapt to a range of deformations and object sizes.

    • Dongheok Shin
    • , Yaroslav Urzhumov
    •  & David R. Smith

  • Article |

    Lenses with superior performance with respect to conventional uniform materials are desirable. The authors show a three-dimensional lens, made of multilayered metamaterials and based on approximate transformation optics, which works in different polarizations at broad viewing angles and with wide bandwidth.

    • Hui Feng Ma
    •  & Tie Jun Cui

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