Materials for optics

  • Article
    | Open Access

    Cherenkov detectors are used to detect high energy particles and their performance capabilities depend heavily on the material used. Here, the authors propose use of a Brewster-optics-based angular filter for a detector with increased sensitivity and particle identification capability.

    • Xiao Lin
    • , Hao Hu
    •  & Yu Luo
  • Article
    | Open Access

    Graphene-based photodetectors have many advantages for applications. Here, the authors demonstrate a high-speed optical coherent receiver for optical communications based on graphene-on-plasmonic slot waveguide photodetectors.

    • Yilun Wang
    • , Xiang Li
    •  & Xinliang Zhang
  • Article
    | Open Access

    Broad-band emission of self-trapped exciton in low-dimensional perovskite is prospective for white LED, yet rational design new white perovskite remains challenge. Here, the authors develop an atom-substituting strategy to trigger exciton self-tapping in perovskites and reveal the mechanism behind.

    • Mingming Zhang
    • , Lili Zhao
    •  & Jun Xing
  • Article
    | Open Access

    One-dimensional van der Waals (1D vdW) materials derive interesting behaviour from dimensional confinement. Here the authors study a 1D vdW semiconductor, fibrous red phosphorous, and observe exceptional optical properties of large optical anisotropy and high photoluminescence.

    • Luojun Du
    • , Yanchong Zhao
    •  & Zhipei Sun
  • Article
    | Open Access

    Graphene is the archetype for realizing two-dimensional topological phases of matter. Here, the authors introduce a new topological classification connected to polarization transport, where the topological number is revealed in the spatiotemporal dispersion of the susceptibility tensor.

    • Todd Van Mechelen
    • , Wenbo Sun
    •  & Zubin Jacob
  • Article
    | Open Access

    Despite advances in the design of thermally activated delayed fluorescence (TADF) emitters for devices, the effect of spin interactions is not well understood. Here, the authors report the role of spin-vibronic coupling in TADF organic emitters using transient electron spin resonance spectroscopy.

    • Bluebell H. Drummond
    • , Naoya Aizawa
    •  & Emrys W. Evans
  • Article
    | Open Access

    Ensuring robustness of bound states in the continuum usually relies on precise control of geometrical symmetries, which are quite susceptible to fabrication imperfections. Here, the authors propose to exploit physical symmetries instead, as a way to achieve robust BICs in disordered systems.

    • Qingjia Zhou
    • , Yangyang Fu
    •  & Yadong Xu
  • Article
    | Open Access

    Refraction between anisotropic media is still an unexplored phenomenon. Here, the authors investigate the propagation of hyperbolic phonon polaritons traversing α-MoO3 nanoprisms, showing a bending-free refraction effect and sub-diffractional focusing with foci size as small as 1/50 of the light wavelength in free space.

    • J. Duan
    • , G. Álvarez-Pérez
    •  & P. Alonso-González
  • Article
    | Open Access

    Lead toxicity poses a big hurdle for the commercialization of perovskite optoelectronics, hence reducing the environmental impact holds the answer for its future application. To tackle this challenge, the authors utilize germanium to reduce the lead content, enabling highly luminescent eco-friendly compound for LEDs.

    • Dexin Yang
    • , Guoling Zhang
    •  & Dawei Di
  • Review Article
    | Open Access

    The application space for optical fibers is growing, enabled by fibers built using special materials and processes. In this Review, the authors discuss the materials science behind producing crystalline core fibers for diverse applications and progress in the field.

    • Ursula J. Gibson
    • , Lei Wei
    •  & John Ballato
  • Review Article
    | Open Access

    This review presents an overview of scenarios where van der Waals (vdW) materials provide unique advantages for nanophotonic biosensing applications. The authors discuss basic sensing principles based on vdW materials, advantages of the reduced dimensionality as well as technological challenges.

    • Sang-Hyun Oh
    • , Hatice Altug
    •  & Michael S. Strano
  • Article
    | Open Access

    Though multiplexing meta-holograms remains an attractive approach for realizing optical encoding, existing methods encode information based on the intensity of the holographic images. Here, the authors report vectorial metasurfaces that decouple and encode intensity and polarization information.

    • Qinghua Song
    • , Arthur Baroni
    •  & Patrice Genevet
  • Article
    | Open Access

    The use of room temperature exciton–polariton Bose–Einstein condensation is limited by the need for external high-finesse microcavities. The authors generate room temperature EPs with single-crystal microribbons as waveguide Fabry–Pérot microcavities, and demonstrate controllable output of coherent light.

    • Ji Tang
    • , Jian Zhang
    •  & Yong Sheng Zhao
  • Article
    | Open Access

    Raman optical activity (ROA) is useful for studying conformational structure and behavior of chiral molecules, but is limited by the weak signals. Here, the authors demonstrate 100x signal enhancement via an all-dielectric approach, using a silicon nanodisk array and exploiting its dark mode.

    • Ting-Hui Xiao
    • , Zhenzhou Cheng
    •  & Keisuke Goda
  • Article
    | Open Access

    Precisely controlling the chemical composition and structure of nanoclusters is an ongoing challenge. Here, the authors report a clickable assembly strategy to construct widely varied lanthanide nanoclusters with synergized optical functionalities.

    • Jie Zhou
    • , Yang Wei
    •  & Ling Huang
  • Article
    | Open Access

    Borates offer extended structural diversity and promise in diverse applications. Here the authors report a borate with linear BO2 units as well as NMR spectroscopy characterization that provides a quantitative basis for identification of BO2 units in polycrystalline and non-crystalline samples.

    • Chunmei Huang
    • , Miriding Mutailipu
    •  & Shilie Pan
  • Article
    | Open Access

    In situ vibrational spectroscopy affords a powerful tool for probing elementary chemical processes on catalytic surfaces. Using surface enhanced Raman scattering, authors identify an array of multicarbon species formed on a Ag nanoparticle catalyst in plasmon-driven reduction of CO2 in water.

    • Dinumol Devasia
    • , Andrew J. Wilson
    •  & Prashant K. Jain
  • Article
    | Open Access

    Photonic crystals have a range of desirable properties for manipulating light. Here, the authors calculate and use the photonic band gap for thousands of such crystals to examine heuristics for their design and predict new photonic crystal structures.

    • Rose K. Cersonsky
    • , James Antonaglia
    •  & Sharon C. Glotzer
  • Article
    | Open Access

    Rare-earth ion (REI)-doped systems are well suited for realising coherent light-spin interfaces, but demonstrations of spectral hole burning (SHB) in optical transitions of REI-based systems have been so far limited to REIs dispersed in matrices. Here, the authors report on transient SHB in a binuclear Eu(III) complex.

    • Kuppusamy Senthil Kumar
    • , Diana Serrano
    •  & Mario Ruben
  • Article
    | Open Access

    Charge trapping can lead to severe nonradiative losses in colloidal semiconductor nanocrystals (NCs). The authors report femtosecond electron diffraction measurements on photoexcited NCs to reveal atomic-scale insights into how localization of charges at trap sites induce surface deformations.

    • Burak Guzelturk
    • , Benjamin L. Cotts
    •  & Aaron M. Lindenberg
  • Article
    | Open Access

    High-frequency rectifiers at terahertz regime are pivotal components in modern communication, whereas the drawbacks in semiconductor junctions-based devices inhibit their usages. Here, the authors report electromagnetic rectification with high signal-to-noise ratio driven by chiral Bloch-electrons in type-II Dirac semimetal NiTe2-based device allowing for efficient THz detection.

    • Libo Zhang
    • , Zhiqingzi Chen
    •  & Wei Lu
  • Article
    | Open Access

    Blue phases are spatially ordered yet fragile liquid crystalline structures, bearing applications in optoelectronics and photonics. Hu et al. show that self-assembly within a mixture of different mesogens may significantly broaden the temperature range over which they are stable.

    • Wei Hu
    • , Ling Wang
    •  & Huai Yang
  • Article
    | Open Access

    Strong nonlinearities in 2D materials can lead to interesting applications in optoelectronics. Here the authors investigate the optical nonlinearity of palladium diselenide, determine the layer dependent two photon absorption efficiency and the saturable absorption modulation depth.

    • Juan Yu
    • , Xiaofei Kuang
    •  & Yanping Liu
  • Article
    | Open Access

    Designing effective covert security features is highly regarded to deter counterfeit of goods and currency in the global markets. Here, the authors present an electrohydrodynamically printed unicolour multifluorescent-lifetime security tag system based on perovskite to provide an alternative yet affordable solution.

    • Sergii Yakunin
    • , Jana Chaaban
    •  & Maksym V. Kovalenko
  • Article
    | Open Access

    Here, the authors introduce In3SbTe2 (IST) as a programmable material platform for plasmonics and nanophotonics in the infrared. They demonstrate direct optical writing, modifying and erasing of metallic crystalline IST nanoantennas, tuning their resonances, as well as nanoscale screening and soldering.

    • Andreas Heßler
    • , Sophia Wahl
    •  & Thomas Taubner
  • Article
    | Open Access

    Creating an enhanced-security-level label that carries entirely distinct information in different optical states has proven challenging. Here, the authors design geminate labels by programming fluorescent cholesteric liquid crystal microdroplets to encrypt fluorescent security information behind colorful reflective patterns.

    • Lang Qin
    • , Xiaojun Liu
    •  & Yanlei Yu
  • Article
    | Open Access

    Achieving bright and efficient blue emission in metal halide perovskite light-emitting diodes has proven to be challenging. Here, the authors demonstrate high EQE and spectrally stable blue light-emitting diodes based on mixed halide perovskites, with emission from 490 to 451 nm by using a vapour-assisted crystallization technique.

    • Max Karlsson
    • , Ziyue Yi
    •  & Feng Gao
  • Article
    | Open Access

    Quantized circular photogalvanic effect (CPGE) is predicted in chiral topological semimetals, but the experimental observation remains challenging. Here, Ni et al. observe a large topological longitudinal photocurrent in CoSi, which is much larger than the photocurrent in any other chiral crystals, indicating quantized CPGE within reach upon doping and increase of the hot-carrier lifetime.

    • Zhuoliang Ni
    • , K. Wang
    •  & Liang Wu
  • Article
    | Open Access

    In organic semiconducting molecules materials, distorted π-systems enable strong coupling with circular polarized light while planar π-stacking systems are necessary for high charge-carrier mobility. Here, the authors address this dilemma by introducing a skeleton merging approach through distortion of a perylene diimide core with four fused heteroaromatics to form a π-extended double helicene.

    • Li Zhang
    • , Inho Song
    •  & Jianbin Lin
  • Article
    | Open Access

    Thermal metamaterials are able to produce unconventional physical properties. Here, the authors demonstrate a thermal metamaterial with conductivity that can be continuously tuned over a very large range.

    • Guoqiang Xu
    • , Kaichen Dong
    •  & Cheng-Wei Qiu
  • Article
    | Open Access

    Here, the authors investigate the polarization-dependent optical characteristics of cavities formed using α-MoO3 to extend the degrees of freedom in the design of IR photonic components exploiting the in-plane anisotropy of this material. Absorption over 80% and polarization conversion is reported without the need for nanoscale fabrication.

    • Sina Abedini Dereshgi
    • , Thomas G. Folland
    •  & Koray Aydin
  • Article
    | Open Access

    Designing quantum dot superlattices remains a challenge. Here, the authors present CdTe quantum dot superlattices via the layer-by-layer assembly and verify the miniband formation by measuring the excitation energy the dependence of the photoluminescence spectra and the detection energy dependence of the excitation spectra.

    • TaeGi Lee
    • , Kazushi Enomoto
    •  & DaeGwi Kim
  • Article
    | Open Access

    Large absorption of high-index semiconductors has hindered the application of all dielectric nanostructures in the visible range. Here, the authors present bandgap-engineered hydrogenated amorphous Si nanoparticles with Q-factors up to 100 and their integration with photochromic molecules as tunable meta-atoms.

    • Mingsong Wang
    • , Alex Krasnok
    •  & Yuebing Zheng
  • Article
    | Open Access

    Though organic light-emitting diodes are highly desirable for display and lighting applications, efficiency roll-off at high current densities limits its applicability. Here, the authors report a triplet scavenging strategy for improved triplet exciton management and reduced efficiency roll-off.

    • Buddhika S. B. Karunathilaka
    • , Umamahesh Balijapalli
    •  & Chihaya Adachi
  • Article
    | Open Access

    Integration of III-V semiconductor microlasers into modern Si or Si3N4 based photonic integrated circuits remains a challenge. Here, the authors demonstrate a perovskite vortex microlaser with highly directional outputs and well-controlled topological charges that is highly compatible with most materials.

    • Wenzhao Sun
    • , Yilin Liu
    •  & Shumin Xiao
  • Article
    | Open Access

    SERS can be unreliable for biomedical use. The authors demonstrate a metal-free nanostructure composed of porous carbon nanowires in an array as a SERS substrate. It offers 106 signal enhancement due to strong broadband charge-transfer resonance and substrate-to-substrate, spot-to-spot and time-to-time consistency in the SERS spectrum.

    • Nan Chen
    • , Ting-Hui Xiao
    •  & Keisuke Goda
  • Article
    | Open Access

    Direct epitaxial growth of III-V on Si for optical emitters and detectors remains a challenge. Here, the authors demonstrate in-plane monolithic integration of an InGaAs nanostructure p-i-n photodetector on Si capable of high-speed optical data reception at 32 Gbps enabled by a 3 dB bandwidth exceeding 25 GHz.

    • Svenja Mauthe
    • , Yannick Baumgartner
    •  & Kirsten E. Moselund