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Directly modulated semiconductor lasers are shown to be able to operate with bandwidths exceeding 65 GHz thanks to a cavity design that harnesses photon–photon resonances.
A theoretical and experimental study of the transverse spin appearing in non-paraxial light when the source is totally unpolarized is reported, in sharp contrast to the usual longitudinal spin, which is directly related to the 2D polarization and vanishes in unpolarized fields.
Photonic crystal-based optical parametric oscillators have remained elusive but have finally been demonstrated. Operating at telecom wavelengths, the source may prove particularly useful in quantum optics applications.
Single-pass optical parametric amplification is demonstrated following propagation though an atomically thin semiconducting transition metal dichalcogenide. The demonstration may lead to atom-sized tunable light sources.
Using a gas-filled anti-resonant-reflection photonic-crystal fibre, a high-brightness table-top source of coherent carrier-envelope-phase-stable waveforms is demonstrated across seven octaves (340 nm to 40,000 nm) with ultraviolet peak powers up to 2.5 MW and terahertz peak powers of 1.8 MW, without the need for changing nonlinear crystals.
An epsilon-near-zero medium is used to demonstrate ultrastrong coupling between phonons and gap plasmons. The approach may pave the path to exploitation of vibrational transitions.
Researchers demonstrate vectorial optomechanical effects using a nematic liquid crystal and report creation of multiple self-induced lenses from a single beam.
Energy resolution of high-energy photon detectors is desired for applications ranging from biomedical imaging to homeland security. In this work, perovskite-based γ-ray detection with 1.4% energy resolution is demonstrated.
A spin–orbit coupling effect in photonic graphene made of coupled polaritonic microcavities is experimentally realized, revealing the unique fine structure of the eigenstates around the Dirac points, with the formation of a Dresselhaus-like effective magnetic field that can be mapped to a non-Abelian gauge field.
Distributed quantum metrology is demonstrated for both individual and averaged phase shifts by using discrete-variable entangled photons. An error reduction of 4.7 dB below the shot-noise limit is achieved when a total number of photon passes is 21.
By focusing a sub-relativistic infrared laser pulse onto a silica target, a periodic deflection pattern of attosecond electron pulse trains is observed. It reveals these subcycle charge dynamics with a streaking speed of ~60 μrad as−1.
Real-space mid-infrared nanoimaging reveals vibrational strong coupling between molecules and propagating phonon polaritons in unstructured, thin hexagonal boron nitride layers, which could provide a platform for testing strong coupling and local control of chemical properties.
A method to control the topological properties of two-dimensional (2D) materials on few-femtosecond timescales is proposed. By controlling the sub-cycle structure of non-resonant driving fields, it may be possible to coherently write, manipulate and read selective valley excitation.
Ultrafast lightwave sampling based on scanning tunnelling microscopy is developed to resolve near fields with sub-picosecond time resolution and sub-nanometre spatial resolution. Parameter-free quantitative measurement is achieved by using a single-molecule switch.
An ytterbium sublattice in an erbium-sensitized multilayer core–shell structure enables photon upconversion from lanthanide ions under 1,530 nm irradiation.
A silicon-germanium integrated homodyne detector with a footprint of 0.84 mm2 is fabricated to enhance the speed performance of quantum light measurement. It can measure the spectrum of squeezing from 100 MHz to 9 GHz of a squeezed light source.
The first lasing results at SwissFEL, an X-ray free-electron laser, are presented, highlighting the facility’s unique capabilities. A general comparison to other major facilities is also provided.
By combining a photoinduced effective χ(2) nonlinearity with resonant enhancement and perfect phase matching in a silicon nitride microring resonator, second-harmonic generation with milliwatt-level output powers with up to 22 ± 1% power conversion efficiency is demonstrated.