Optics and photonics

  • Article
    | Open Access

    The realization of Jones matrix with full eight free parameters is particularly challenging. Here, the authors construct spatially varying Jones matrix with eight free parameters by cascading two-layer metasurfaces and use it for new optical functionalities.

    • Yanjun Bao
    • , Fan Nan
    •  & Baojun Li
  • Article
    | Open Access

    Lead halide perovskites have recently emerged as a promising platform for the study of polariton superfluidity at room temperature. Here the authors report a complete set of quantum fluid phase transitions in both 1D and 2D homogeneous single crystals of CsPbBr3.

    • Kai Peng
    • , Renjie Tao
    •  & Wei Bao
  • Article
    | Open Access

    Fabrication errors limit the scaling of programmable photonic circuits. Here the authors show how a broad class of circuits can be made asymptotically fault-tolerant, where the effect of errors remains controlled regardless of the circuit’s size.

    • Ryan Hamerly
    • , Saumil Bandyopadhyay
    •  & Dirk Englund
  • Article
    | Open Access

    Traditional methods for cell stiffness measurements are limited by long processing times and unsuitability for multiple cell analysis. Here, the authors demonstrate a fast technique based on acoustic stimulation and holographic imaging to reconstruct whole-cell stiffness maps of individual and multiple cells.

    • Rahmetullah Varol
    • , Zeynep Karavelioglu
    •  & Huseyin Uvet
  • Article
    | Open Access

    Holography recreates both the amplitude and wave front of a three dimensional object, meaning that the observer perceives the image in the nearly same way as they would the true object. Creating such holographic images is challenging computationally, and requires extremely fast display update. Here, the authors combine a fast memoryless computation algorithm with the ultra-rapid writing based on all-optical switching of a ferrimagnetic film.

    • M. Makowski
    • , J. Bomba
    •  & A. Stupakiewicz
  • Article
    | Open Access

    Here the authors report the development of a topological nonlinear parametric amplification in a dimerized, Su-Schrieffer-Heeger waveguide. Kerr-induced chiral symmetry breaking is demonstrated, showcasing how nonlinearities may control transitions of topological modes to bulk states.

    • Byoung-Uk Sohn
    • , Yue-Xin Huang
    •  & Dawn T. H. Tan
  • Article
    | Open Access

    Future optical devices, e.g., for AR and VR, will require sophisticated flat metaoptics with unique optical functionalities. The authors demonstrate a metaobjective based on electrically switchable metallic polymer metalenses, whose optical states and focal length is adjustable via CMOS compatible voltages.

    • Julian Karst
    • , Yohan Lee
    •  & Harald Giessen
  • Article
    | Open Access

    The authors demonstrate on-the-fly reconfigurable optical trapping of organic polariton condensates which are delocalised over a macroscopic distance from the excitation region, holding great potential for future work on polaritonic lattice physics.

    • Mengjie Wei
    • , Wouter Verstraelen
    •  & Hamid Ohadi
  • Article
    | Open Access

    Floquet engineering aims at inducing new properties in materials with light. Here the authors have used pulses of variable durations, to investigate its applicability in the femtosecond domain. Surprisingly, they found that it holds to the few-cycle limit.

    • Matteo Lucchini
    • , Fabio Medeghini
    •  & Mauro Nisoli
  • Article
    | Open Access

    High-resolution molecular spectroscopy with cryogenic setups is hampered by the lack of a skilled interrogation tool. Here, the authors demonstrate absolute metrology of cold rovibrational spectra at 1 kHz accuracy level, by coupling a Lamb-dip saturated-absorption cavity ring-down spectrometer to a buffer-gas cooling source.

    • Roberto Aiello
    • , Valentina Di Sarno
    •  & Pasquale Maddaloni
  • Article
    | Open Access

    Hybrid quantum technologies synergistically combine different types of systems with complementary strengths. Here, the authors show monolithic integration and control of quantum dots and the emitted single photons in a surface acoustic wave-driven GaAs integrated quantum photonic circuit.

    • Dominik D. Bühler
    • , Matthias Weiß
    •  & Hubert J. Krenner
  • Article
    | Open Access

    Here, the authors integrate a photonic crystal, supporting photonic bound states in the continuum (BICs), with monolayer WSe2, and leverage the high energy confinement of the BIC modes to demonstrate coherent directional dark exciton emission.

    • Xuezhi Ma
    • , Kaushik Kudtarkar
    •  & Shoufeng Lan
  • Article
    | Open Access

    Controlling the high-power laser transmittance is built on the diverse manipulation of multiple nonlinear absorption processes in the nonlinear optical materials. Here, the authors demonstrate the crucial role of hot-carrier effect to tune the nonlinear absorption response in quasi-2D perovskite films.

    • Gang Wang
    • , Tanghao Liu
    •  & Guichuan Xing
  • Article
    | Open Access

    Light-matter interaction can induce changes to the properties of the system by creating hybrid collective states of light and molecular excitations, the so called polaritons. Here the authors use femtosecond pump-probe spectroscopy to explore exciton-polariton dynamics in a photosynthetic protein, light harvesting 2 complexes, and find evidence for rapid energy transfer to dark polariton states.

    • Fan Wu
    • , Daniel Finkelstein-Shapiro
    •  & Tönu Pullerits
  • Article
    | Open Access

    Many recent studies have explored the response of magnetic systems to circularly polarised light. To achieve this, typically experiments use a birefringent crystal. Here, Yang et al show that any small error in the alignment of the crystal can result in a beam shift, and this shift can lead to spurious signals similar yet unrelated to the electron spin.

    • Haozhe Yang
    • , Eva Schmoranzerová
    •  & Ioan-Mihai Miron
  • Article
    | Open Access

    Extending the control over topological system will open the doors to both fundamental studies and applications. Here the authors demonstrate thouless topological transport of light in a bulk tunable moiré lattice.

    • Peng Wang
    • , Qidong Fu
    •  & Fangwei Ye
  • Article
    | Open Access

    Experimental evidence is given that upon the optical excitation of surface plasmon polaritons, a nonthermal electron population appears in the topmost domain of the plasmonic film directly coupled to the local fields.

    • Judit Budai
    • , Zsuzsanna Pápa
    •  & Péter Dombi
  • Article
    | Open Access

    Achieving optical cryptography scheme with both high capacity and security is highly desirable. Here, authors report a Stokes meta-hologram with a hierarchical encryption strategy that allows vector encryptions to produce depth-masked ciphertexts.

    • Xuyue Guo
    • , Peng Li
    •  & Jianlin Zhao
  • Article
    | Open Access

    A unified metric to assess the performances of quantum transducers, i.e., converters of quantum information between different physical systems - is still lacking. Here the authors propose quantum capacity as such metric, and use it to investigate the optimal designs of generic quantum transduction schemes.

    • Chiao-Hsuan Wang
    • , Fangxin Li
    •  & Liang Jiang
  • Article
    | Open Access

    The authors report high-efficiency emission depletion through a surface migration emission depletion mechanism, which takes advantage of the effects of surface quenching and energy migration in nanocrystals. They demonstrate super-resolution microscopy with very low depletion saturation intensities.

    • Rui Pu
    • , Qiuqiang Zhan
    •  & Xiaogang Liu
  • Article
    | Open Access

    The authors demonstrate a label-free superresolution imaging method by using a hyperbolic material as a substrate for tailored light-matter interactions. The hyperbolic material enhanced scattering, combined with dark-field detection, result in 5.5-fold resolution improvement beyond the diffraction limit.

    • Yeon Ui Lee
    • , Shilong Li
    •  & Zhaowei Liu
  • Article
    | Open Access

    Under strong laser fields, materials exhibit extreme non-linear optical response, such as high harmonic generation. These higher harmonics provide insights into electron behaviour in materials in sub-laser cycle timescale. Here, Cha et al study higher harmonic generation resulting from the laser driven motion of massless Dirac fermions in graphene.

    • Soonyoung Cha
    • , Minjeong Kim
    •  & Jonghwan Kim
  • Article
    | Open Access

    Here the authors experimentally demonstrate a photonic quadrupole topological insulator in a photonic lattice, in which required synthetic π flux is induced by different symmetry representations of the orbitals in a mixed-orbital lattice.

    • Julian Schulz
    • , Jiho Noh
    •  & Georg von Freymann
  • Article
    | Open Access

    The optoelectronic performance of lead halide perovskite in highfluence applications are hindered by heterogeneous multi-polaron interactions in the nanoscale. Here, Nishda et al. spatially resolve sub-ns relaxation dynamics on the nanometer scale by ultrafast infrared pumpprobe nanoimaging.

    • Jun Nishida
    • , Peter T. S. Chang
    •  & Markus B. Raschke
  • Article
    | Open Access

    Development of efficient upconversion (UC) phosphors that emit under irradiation in the NIR II region is challenging - most UC materials rely on the presence of sensitizers absorbing at shorter wavelengths. Here, authors synthesize Er3+ doped ternary sulfides phosphors with visible UC efficiency up to 2.6% and long emission lifetimes under 1532 nm irradiation, via an excited state absorption mechanism.

    • Xiumei Yin
    • , Wen Xu
    •  & Bin Dong
  • Article
    | Open Access

    Designing and manufacturing eco/bioresorbable electronic systems remains a challenge. The authors introduce a picosecond-pulsed laser-based scheme that exploits controlled patterning, thinning, and/or cutting to manipulate multilayers of eco/bioresorbable materials for a wide range of advanced electronic systems.

    • Quansan Yang
    • , Ziying Hu
    •  & John A. Rogers
  • Article
    | Open Access

    Designing single-component materials with white-light electroluminescence is highly demanded for artificial lighting applications. Here, the authors fabricate a single-component white-light electroluminescence device based on an aromatic carbon nitride material with high maximum luminance and external quantum efficiency.

    • Yunhu Wang
    • , Kunpeng Wang
    •  & Jun Xing
  • Article
    | Open Access

    Nanophotonic light sources with programmable emission spectrum are important building blocks for integrated photonics, sensing and optical computing. Here the authors tune the complex laser spectrum of a network laser achieving selective lasing of a single, two or more modes.

    • Dhruv Saxena
    • , Alexis Arnaudon
    •  & Riccardo Sapienza
  • Article
    | Open Access

    The authors developed a pristine hyperspectral SPR microscopy that enables monochromatic and polychromatic SPR imaging with flexible field-of-view option, single-pixel spectral SPR sensing and 2D quantification of thin films with resonant wavelength images.

    • Ziwei Liu
    • , Jingning Wu
    •  & Zhi-mei Qi
  • Article
    | Open Access

    THz imaging and spectroscopy always request even more efficient components. Here the authors, thanks to a modified photoconductive switch that includes a graphene layer, demonstrate a high-speed photoconductive switch without sacrificing the generated power.

    • Dehui Zhang
    • , Zhen Xu
    •  & Zhaohui Zhong
  • Article
    | Open Access

    Efficient and broadband visible-light photodetectors will bring great advantages in applications such as biosensing and quantum information. Here the authors develop a photodetector with high quantum efficiency across broad wavelength range suitable for monolithic integration in photonics circuits.

    • Yiding Lin
    • , Zheng Yong
    •  & Joyce K. S. Poon
  • Article
    | Open Access

    Dipolar excitons enable large nonlinear interaction but are usually hampered by their weak oscillator strength. Here, the authors demonstrate the strong light-matter coupling of interlayer dipolar excitons having unusually large oscillator strength in bilayer MoS2 resulting in highly nonlinear dipolar polaritons.

    • Biswajit Datta
    • , Mandeep Khatoniar
    •  & Vinod M. Menon
  • Article
    | Open Access

    We show frequency domain mirrors that provide reflections of optical mode propagation in the frequency domain. We theoretically investigated the mirror properties and experimentally demonstrate it using polarization and coupled-resonator-based coupling on thin film Lithium Niobate.

    • Yaowen Hu
    • , Mengjie Yu
    •  & Marko Lončar
  • Article
    | Open Access

    Here, the authors integrate measured fabrication constraints in topology optimization to design a highly optimized dielectric nanocavity. The theoretically predicted confinement of light below the diffraction limit is confirmed by near- and far-field spectroscopy.

    • Marcus Albrechtsen
    • , Babak Vosoughi Lahijani
    •  & Søren Stobbe
  • Article
    | Open Access

    Slow light effects are interesting for telecommunications and quantum photonics applications. Here, the authors use coupled exciton-surface plasmon polaritons (SPPs) in a hybrid monolayer WSe2-metallic waveguide structure to demonstrate a 1300-fold reduction of the SPP group velocity.

    • Matthew Klein
    • , Rolf Binder
    •  & John R. Schaibley
  • 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