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Optical second-harmonic waves are generated from the electric quadrupole contribution in a centrosymmetric magnetic Weyl semimetal Co3Sn2S2. Two magnetic orders and phase transitions are explored in temperature-dependent rotational anisotropy measurements by second-harmonic generation.
Combining random illumination microscopy with coherent anti-Stokes Raman scattering and sum-frequency generation contrasts, a robust wide-field nonlinear microscope with a 3 µm axial sectioning capability and a 300 nm transverse resolution is demonstrated.
Introduction of a starch-based layer inhibits ion migration and repairs defects generated on light/dark cycles in perovskite solar cells. Cells retain 98.0% of the initial power conversion efficiency after 42 illumination cycles, and achieve a certified power conversion efficiency of 23.9%.
Thanks to the unique properties of twisted double bilayer graphene heterostructures, an ultra-broadband photoconductivity spanning the spectral range of 2–100 μm with internal quantum efficiencies of approximately 40% at speeds of 100 kHz is reported.
Time reflection and refraction are experimentally observed in ultracold atoms. To this end, the time boundary is formed by imposing an abrupt change in the coupling strength of the atomic chain. Time boundary effects are robust against material disorder.
A self-contained ring laser interferometre measures length-of-day variations due to global mass transport phenomena with a precision of a few milliseconds over several months of measurements.
Researchers demonstrated coherent dissipative Kerr solitons with a conversion efficiency exceeding 50% and good line spacing stability. The results may facilitate practical implementation of a scalable integrated photonic architecture for energy-efficient applications.
Inefficient filters and overall efficiency are issues for display technology. Luminescent concentrator pixels have been used with CdSe/CdS quantum dot emitters, which enable both colour and polarization filtering, as well as nearly 41% extraction efficiency.
Detecting the vibrations of individual molecules directly in the mid-infrared regime is hindered by thermal noise. Here researchers bypass conventional detectors and upconvert the mid-infrared photons into visible light using molecular bonds, yielding an optical readout for single-molecule vibrational spectroscopy.
Attosecond transient reflectivity spectroscopy, in combination with extensive time-dependent density functional theory calculations, is used to study field-driven carrier injection in germanium in the time window of few femtoseconds around pulse overlap, paving a route towards achieving full optical control over charge carriers in semiconductors.
Biphoton digital holography is developed to perform quantum state tomography in a short measurement time. The interference between an unknown and a reference biphoton state is used to retrieve amplitude and phase information through coincidence imaging on a time-stamping camera.
Intraband electroluminescence (EL) from n-doped core–shell HgSe–CdSe colloidal quantum dots is observed around the wavelength of 5 µm. The measured EL quantum efficiency is 4.5% at the injection current of 2 A cm−2, benefiting from the cascade effect. The power efficiency is 0.05%.
A new approach enables handwriting high-performance perovskite optoelectronic devices with a common ballpoint pen on diverse substrates, including paper, textiles, plastics, rubber and common 3D objects in daily life.
Nanoplasmonic antennas enable label-free monitoring of bacterial enzymes released via outer membrane vesicles. Real-time monitoring reveals the oscillatory behaviour of enzymatic release from individual bacteria as well as the effects of coupled oscillation from neighbouring bacteria.
Bright solitons are produced through the interaction of pulse pairs generated via a continuous-wave fibre laser, which pumps two coupled microresonators featuring normal dispersion. Multicolour pulse pairs over multiple rings can also be generated, of great promise for applications such as all-optical soliton buffers and memories, study of quantum combs and topological photonics.
Natural vibrations of mesoscopic particles, such as living cells, are typically faint; occurring at megahertz to gigahertz frequencies also makes detection challenging. Now, researchers demonstrate real-time measurement of natural vibrations of single mesoscopic particles by using photoacoustic excitation and acoustic coupling to an optical microresonator for readout.
The incoherent component of the fluorescence from a single two-level atom is investigated after rejecting the coherent component. Contrary to intuition, its photon statistics experimentally shows strong photon bunching. This result suggests that the atom does in fact simultaneously scatter two photons.
An inequality is shown to exist between the spectral directional emissivity and absorptivity in a structure supporting a guided-mode resonance coupled to a magneto-optic material. This finding provides the direct observation of the violation of Kirchhoff’s law of thermal radiation.