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Two-dimensional arrays of short-cavity surface-emitting THz quantum cascade lasers are phase-locked to each other via mutual coupling. A directive beam on the order of 10° divergence and a maximum slope efficiency of 450 mW A−1 is achieved.
Researchers demonstrate microwave phonon waveguide circuits and tunable delay and filter for microwave-photonics signals carried by 1,500 nm wavelength light.
A single-source multimodal nonlinear optical imaging system has been developed to probe different endogenous biomolecules. Rapid, stain-free imaging of fresh tissue specimens is possible with short turnaround times for disease diagnosis.
Ultrashort pulses covering the 1–30 THz range are generated from a W/CoFeB/Pt trilayer and originate from photoinduced spin currents, the inverse spin Hall effect and a broadband Fabry–Pérot resonance. The resultant peak fields are several 100 kV cm–1.
More than 10,000 time-division-multiplexed degenerate parametric oscillators are generated using phase-sensitive amplification in a nonlinear optical fibre. They can be used to simulate a coherent Ising machine that could solve difficult computing problems.
Ultralow-noise frequency conversion within the 980-nm band and between the 980-nm and 1,550-nm bands occurs through Bragg scattering in Si3N4 microring resonators. The maximum conversion efficiencies are 25% and 60%, respectively.
Scientists report a piezo-optomechanical circuit platform that combines localized and interacting 1,550 nm photons and 2.4 GHz phonons with photonic and phononic waveguides, enabling new devices for signal transduction between the optical, electrical and mechanical domains.
Using time-stretch dispersive Fourier transform, scientists directly observe the spectro-temporal dynamics of the mode-locking transition on a single-shot basis over long record lengths of ∼900,000 consecutive pulses.
By exploiting geometric phase control inside a laser cavity to map polarization to orbital angular momentum, a new class of laser that is able to generate all states on the higher-order Poincaré sphere is reported.
A single photon with near-unity indistinguishability is generated from quantum dots in electrically controlled cavity structures. The cavity allows for efficient photon collection while application of an electrical bias cancels charge noise effects.
Scientists experimentally demonstrate a fully configurable photonic integrated signal processor based on an InP–InGaAs material system by controlling the injection currents to the active components.