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Dark pulse combs are formed in normal-dispersion microresonators with mode-interaction-assisted excitation, increasing freedom in microresonator design and potentially extending Kerr comb generation into the visible wavelength regime.
Researchers exploit direct stochastic optical reconstruction microscopy and dedicated detection of super-critical-angle fluorescence emission to enable direct optical nanoscopy with axially localized detection.
A mechanism for the propagation of mid-infrared femtosecond laser pulses in air is theoretically investigated. A numerical simulation predicts that the propagation of multiple-terawatt pulses is possible over hundreds of metres.
The prediction of light propagation up to hundreds of millimetres within straight or even deformed segments of multimode fibres is demonstrated. The concept is applied in an endoscope and exceptional resolution and footprint are obtained.
A high-dimensional hyperentanglement of polarization and energy–time subspaces is demonstrated using a biphoton frequency comb. The long-postulated Hong–Ou–Mandel quantum revival is exhibited, with up to 19 time-bin dimensions and 96.5% visibility.
Atomically thin layers of transition metal dichalcogenides are shown to exhibit a disappearance of strong excitonic absorption along with population inversion at the direct gap over a spectral range of hundreds of meV after pulsed photoexcitation.
The observation of macroscopic and direct light propulsion of bulk-graphene-based material offers an exciting opportunity for realizing long-sought proposals in areas such as space transportation driven directly by sunlight.
Monitoring the interaction between the local environment and a particle trapped inside a hollow optical fibre offers a new approach for optical sensing.
A 10 μm quantum cascade laser is phase-locked to a remote ultrastable laser referenced to primary frequency standards using an optical frequency comb. The obtained relative stability of 2 × 10−15 is record-breaking in the mid-infrared region.
Researchers show that nonlinear polarization dynamics in a vertical-cavity surface-emitting laser inside an external cavity can result in the emission of temporal dissipative solitons.
An end-to-end continuous-variable quantum key distribution system with an untrusted node is proposed. A proof-of-principle experiment shows that 10−1 secret key bits per relay use are distributed at 4 dB loss, corresponding to 20 km in optical fibre.
Solid-state X-ray detectors have enabled real-time diagnostics as well as reduced patient dose. Now researchers have shown that potentially inexpensive perovskites can be used for efficient X-ray imaging.
2D Raman spectroscopy, based on fifth-order optical nonlinearity, is performed with a single beam of shaped fs optical pulses. The scheme inherently eliminates the cascade signal, making the vibrational coupling information easy to extract.
Novel trapping mechanisms for ultracold atoms in specially engineered two-dimensional photonic crystals are proposed. The photonic crystal waveguides provide versatile means for creating strongly long-range atom–atom interactions mediated by photons.
Researchers propose that a cold atom in a one-dimensional photonic crystal waveguide can form a cavity. This system should allow interaction with other atoms within the effective cavity length.
A quantum memory based on a Raman scheme is implemented for photonic qubits encoded in the path and polarization of single photons. The performance is quantified before and after storage in cold atomic ensembles and the storage bandwidth is ∼140 MHz.
Researchers exploit the strong dependence of gap-plasmon phase velocity on gap width to make a compact phase-modulator. An electromechanically variable gap size enables a 23-μm-long non-resonant modulator with moderate losses.