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A 10 Gb s–1 phase modulator based on a graphene-on-silicon Mach–Zehnder interferometer (MZI) is reported. The compact device has a phase-shifter length of only 300 μm and provides modulation of light at 1,550 nm with a 35 dB extinction ratio.
Frequency-resolved transient excited-state absorption of a single molecule is measured at room temperature. The dynamic Stokes shift and vibrational cooling are directly measured with 25 fs temporal resolution and a spectral detection bandwidth of hundreds of meV.
Through a high-numerical-aperture multimode fibre, real-time manipulation of three-dimensional arrangements of micro-objects and manipulation inside inaccessible cavities are shown. The approach is useful for imaging deep inside living tissues and complex environments.
Attosecond electron pulse trains in electron microscopy are demonstrated through the coupling of phase-locked multicolour optical fields with electron pulses. A new variant of quantum state tomography for free-electron ensembles is established.
One-dimensional non-diffracting sheets of light are achieved without exploiting nonlinearity. Such light sheets may be exploited in microscopy and sensing applications.
An optical-based scheme for ultrasound sensing provides very high sensitivity with excellent broadband acoustic frequency response and wide directivity.
The Pohang Accelerator Laboratory X-ray Free Electron Laser (PAL-XFEL) in South Korea has now entered operation with a timing jitter of just 20 fs.
Exploiting the peculiar properties of graphene, a series of high-performance glass-on-graphene devices, such as polarizers, thermo-optic switches and mid-infrared waveguide-integrated photodetectors and modulators are realized.
Rabi oscillations in the regime of hard X-rays are observed between two ensembles of the nuclear resonant isotope 57Fe. The sample system consists of two thin-film cavities stacked on top of each other, coupled through a thin interlayer.
Double perovskite Cs2AgBiBr6 single crystals are used to make a sensitive X-ray detector. The device exhibits a high sensitivity of 105 µC Gyair−1 cm−2 and a low detection limit of 59.7 nGyairs−1, and demonstrates long-term operational stability.
Exploiting Einstein’s theory of general relativity, the curved space associated with specially designed nanophotonic structures is shown to be able to manipulate light propagation.
Donor dye nanoparticles have been used to realize structures that are 25 times brighter than quantum dots. This enabled single-molecule imaging using ambient light.
The observation of soliton crystals in monolithic Kerr microresonators is reported. The physics of such resonators is explored in a regime of dense soliton occupation, offering a way to increase the efficiency of Kerr combs.
Isolated attosecond pulses (IAPs) in the extreme-ultraviolet range are generated by the interaction of half-cycle mid-infrared pulses with gas (Xe, Kr or Ar) and solid media (quartz). The energy of the IAPs is optically tunable over an octave.
By driving a high-Q fibre-based Fabry–Pérot microresonator with periodic, picosecond optical pulses, deterministic generation of stable femtosecond dissipative cavity solitons has been experimentally realized.
Single-photon emission with 99% purity is generated from sp3 defects in carbon nanotubes (CNTs) by optical excitation at room temperature. By increasing the CNT diameter from 0.76 nm to 0.94 nm, the emission wavelength can be changed from 1,100 nm to 1,600 nm.