Optics and photonics

  • Article
    | Open Access

    Experimental studies of the Casimir effect have involved only interactions between two bodies so far. Here, the authors observe a micrometer-thick cantilever under the Casimir force exerted by microspheres from two sides simultaneously.

    • Zhujing Xu
    • , Peng Ju
    •  & Tongcang Li
  • Article
    | Open Access

    Fibre-based entanglement distribution represents a key primitive for quantum applications such as QKD. Here, the authors demonstrate it across 248 km of deployed fiber, observing stable detected pair rates of 9 Hz for 110 h.

    • Sebastian Philipp Neumann
    • , Alexander Buchner
    •  & Rupert Ursin
  • Article
    | Open Access

    Successfully controlling an optical signal by a single gate photon would have great applicability for quantum networks and all-optical computing. Here, the authors realise a single-photon transistor in the microwave regime based on superconducting quantum circuits.

    • Zhiling Wang
    • , Zenghui Bao
    •  & Luming Duan
  • Article
    | Open Access

    Improving the image depth perception of holograms while maintaining high image quality is a current challenge. Here the authors propose an efficient solution relying on a multi-plane hologram technique that reconstruct different blurred images and sharply focused images depending on a propagation distance.

    • Daeho Yang
    • , Wontaek Seo
    •  & Hong-Seok Lee
  • Article
    | Open Access

    Synthetic lattice systems are powerful platforms for studying the influence of intrinsic nonlinearities on topological phenomena. Here the authors elucidate the topological transport of solitons in terms of Wannier functions displacement and they introduce a nonlinearity-induced topological transport effect that could be observed in ultracold quantum mixtures.

    • Nader Mostaan
    • , Fabian Grusdt
    •  & Nathan Goldman
  • Article
    | Open Access

    3D depth sensing with structured light enables simultaneous imaging of multiple objects, but has limited field of view and low efficiency. Here, the authors demonstrate 3D imaging with scattered light from a metasurface composed of periodic supercells, covering a 180° field of view with a high-density dot array.

    • Gyeongtae Kim
    • , Yeseul Kim
    •  & Junsuk Rho
  • Article
    | Open Access

    The use of light in driving the magnetization of materials has great technological potential, as well as allowing for insights into the fast dynamics of magnetic systems. Here, the authors combine CrI3, a van der Waals magnet, with WSe2, and demonstrate all optical switching of the resulting heterostructure.

    • Maciej Da̧browski
    • , Shi Guo
    •  & Robert J. Hicken
  • Article
    | Open Access

    Known examples of negative refraction in metamaterials do not distinguish between positive and negative angles of incidence. Here, the authors show that it is possible to break this symmetry using an asymmetric unit cell, and demonstrate it using a mechanical metamaterial working at GHz frequencies.

    • Simone Zanotto
    • , Giorgio Biasiol
    •  & Alessandro Pitanti
  • Article
    | Open Access

    Energy transfer between the electromagnetic field and atoms or molecules is fundamentally interesting. Here the authors demonstrate stepwise energy transfer between broadband mid-infrared optical pulses and vibrating methylsulfonylmethane molecules in aqueous solution.

    • Martin T. Peschel
    • , Maximilian Högner
    •  & Ioachim Pupeza
  • Article
    | Open Access

    Developing longwave infrared technology hide intrinsic challenges but at the same time is important to develop sensing and imaging for detection, ranging, and monitoring systems. Here the authors demonstrate the fabrication of high-quality microresonators in the LWIR with the simple use of native germanium.

    • Dingding Ren
    • , Chao Dong
    •  & David Burghoff
  • Article
    | Open Access

    Fractal optical solitons were studied in theory while it is cumbersome their experimental realization in optics setups. Here, the authors find that breathing solitons in lasers constitute fractals―the devil’s staircases, which are around 3000 times more stable than classical ones.

    • Xiuqi Wu
    • , Ying Zhang
    •  & Heping Zeng
  • Article
    | Open Access

    Imaging though strongly scattering media is challenging and computationally intensive. Here, the authors show that tracking of moving objects can be achieved with minimal computational effort by combining cross-correlations of the measured speckle pattern at different times.

    • Y. Jauregui-Sánchez
    • , H. Penketh
    •  & J. Bertolotti
  • Article
    | Open Access

    Here the authors demonstrate chip-scale high-peak-power lasers by vertical integration of semiconductor and solid state laser gain mediums to reach the same maturity level as existing semiconductor lasers, which are suitable for miniaturization and cost-effective mass production.

    • Jianglin Yue
    • , Kenji Tanaka
    •  & Masanao Kamata
  • Article
    | Open Access

    Mimicking human vision with metasurfaces, the authors propose a new paradigm for high field of view and ultrafast LiDAR, achieving performances also relevant for the next generation of imaging system for ADAS and robotic systems.

    • Renato Juliano Martins
    • , Emil Marinov
    •  & Patrice Genevet
  • Article
    | Open Access

    Understanding the coherent dynamics of electron and nucleus spins in hBN is crucial for their applications as qubits and quantum sensors. Here the authors report room-temperature coherent manipulation of the negatively charged boron vacancy spins in hBN and study their dynamics under weak and strong magnetic fields.

    • Wei Liu
    • , Viktor Ivády
    •  & Guang-Can Guo
  • Article
    | Open Access

    Sensitivity to noise is currently an obstacle to the use of quantum imaging techniques in real-world scenarios. Here, exploiting non-local cancellation of dispersion on time-frequency entangled photons, the authors show a 43dB improvement in resilience to noise for imaging protocols towards a quantum LiDAR.

    • Phillip S. Blakey
    • , Han Liu
    •  & Amr S. Helmy
  • Article
    | Open Access

    The defocusing problem has been considered the main bottleneck for developing optoelectronic μ-compound eye (CE) cameras. Here, the authors report miniature optoelectronic CE cameras with an ommatidia logarithmic-profile. The camera enables large field-of-view imaging, spatial position identification, and sensitive trajectory monitoring of moving targets.

    • Zhi-Yong Hu
    • , Yong-Lai Zhang
    •  & Hong-Bo Sun
  • Article
    | Open Access

    The authors present an approach to underwater imaging, which does not require tethering or batteries. The low-power camera uses power from harvested acoustic energy and communicates colour images wirelessly via acoustic backscatter.

    • Sayed Saad Afzal
    • , Waleed Akbar
    •  & Fadel Adib
  • Article
    | Open Access

    The challenge of high-speed and high-accuracy coherent photonic neurons for deep learning applications lies to solve noise related issues. Here, Mourgias-Alexandris et al. address this problem by introducing a noise-resilient hardware architectural and a deep learning training platform.

    • G. Mourgias-Alexandris
    • , M. Moralis-Pegios
    •  & N. Pleros
  • Article
    | Open Access

    Transition metal dichalcogenides (TMDCs) are interesting for nanophotonic applications due to their high refractive index and excitonic properties. Here, the authors report a scalable bottom-up fabrication method to realize arrays of TMDC metastructures showing dielectric optical modes and self-coupled exciton-polaritons.

    • Fuhuan Shen
    • , Zhenghe Zhang
    •  & Zefeng Chen
  • Article
    | Open Access

    Low modulus materials that can change shape in response to external stimuli are promising for a wide range of applications. The authors here introduce a shape-reprogrammable construct, based on liquid metal microfluidic networks and electromagnetic actuation, that supports a unique collection of capabilities.

    • Xinchen Ni
    • , Haiwen Luan
    •  & John A. Rogers
  • Article
    | Open Access

    Bose-Einstein condensate of excitons is expected in photo-excited bulk semiconductors, but a direct experimental evidence has been lacking. Here the authors report the observation of a condensate of 1s paraexcitons in Cu2O using real-space mid-infrared absorption imaging realized in a dilution refrigerator.

    • Yusuke Morita
    • , Kosuke Yoshioka
    •  & Makoto Kuwata-Gonokami
  • Article
    | Open Access

    Estimating the angular separation between two incoherent sources below the diffraction limit is challenging. Hypothesis testing and quantum state discrimination techniques are used to super-resolve sources of different brightness with a simple optical interferometer.

    • Ugo Zanforlin
    • , Cosmo Lupo
    •  & Zixin Huang
  • Article
    | Open Access

    Hexagonal boron nitride (h-BN) has been used extensively to encapsulate other van der Waals materials, protecting them from environmental degradation, and allowing integration into more complex heterostructures. Here, the authors make use of boron vacancy spin defects in h-BN using them to image the magnetic properties of a Fe3GeTe2 flake.

    • Mengqi Huang
    • , Jingcheng Zhou
    •  & Chunhui Rita Du
  • Article
    | Open Access

    On-Chip integration of laser systems led to impressive development in many field of application like LIDAR or AR/VR to cite a few. Here the authors harness Pockels effect in an integrated semiconductor platform achieving fast on-chip configurability of a narrow linewidth laser.

    • Mingxiao Li
    • , Lin Chang
    •  & Qiang Lin
  • Article
    | Open Access

    The spectrally narrow photoluminescence lines occurring in transition metal dichalcogenides (TMD) heterostructures at low temperature have been attributed to interlayer excitons (IXs) localized by the moiré potential between the TMD layers. Here, the authors show that these lines are present even when the moiré potential is suppressed by inserting an hBN spacer between the TMD layers.

    • Fateme Mahdikhanysarvejahany
    • , Daniel N. Shanks
    •  & John R. Schaibley
  • Article
    | Open Access

    Studying microorganisms at high temperatures is challenging on conventional optical microscopes. Here, the authors introduce the concept of microscale laser heating over the full field of view by using gold nanoparticles as light absorbers, and study thermophile species up to 80 °C.

    • Céline Molinaro
    • , Maëlle Bénéfice
    •  & Guillaume Baffou
  • Article
    | Open Access

    Optical binding enables light-induced assembly of many particles within a focus area. Here, the authors demonstrate that optical binding can occur outside the irradiated area by scattered light interacting with the particles outside the focus, generating arc-shape potential wells for particle trapping.

    • Chih-Hao Huang
    • , Boris Louis
    •  & Hiroshi Masuhara
  • Article
    | Open Access

    A mechanically compliant and robust sensing material is essential for accurate and reliable thermal sensing. Here, the authors report the use of elastic organic crystals as fluorescence-based thermal sensors that cover a wide range of temperatures with complete retention of the sensor’s elasticity.

    • Qi Di
    • , Liang Li
    •  & Hongyu Zhang
  • Article
    | Open Access

    The singlet fission mechanism is still not relatively well understood, except for polyacenes. Here, the authors demonstrate that in diketopyrrolopyrrole supramolecular assemblies, both singlet fission and intersystem crossing can simultaneously happen.

    • Nilabja Maity
    • , Woojae Kim
    •  & Satish Patil
  • Article
    | Open Access

    Laser probing of integrated circuits using sub-bandgap photon energies remains a challenge. Here, the authors propose a super-resolution method capable of achieving probe placement accuracy to better than 10 nm; extraction of electro-optic waveforms from a node of a group of transistors and applied this to isolate and identify a fault on a defective device.

    • V. K. Ravikumar
    • , Jiann Min Chin
    •  & Joel K. W. Yang
  • Article
    | Open Access

    High power efficiency and low roll-off values are essential to the commercialization of white organic light-emitting diodes. Here, the authors construct all-fluorescence devices with an orange emitting layer sandwiched between two sky-blue emitting layers, achieving figure-of-merit of 130.7 lm/W.

    • Hao Liu
    • , Yan Fu
    •  & Zujin Zhao
  • Article
    | Open Access

    Cold-atom interferometers have been miniaturized towards fieldable quantum inertial sensing applications. Here the authors demonstrate a compact cold-atom interferometer using microfabricated gratings and discuss the possible use of photonic integrated circuits for laser systems.

    • Jongmin Lee
    • , Roger Ding
    •  & Peter D. D. Schwindt