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A quantum-optical memristor is realized by means of a laser-written integrated photonic circuit. The memristive dynamics of the device is fully characterized. A memristor-based quantum reservoir computer is proposed as a possible application.
Chiral phonons—long-range lattice vibrations with rotational motion of atoms—are observed by terahertz chiroptical spectroscopy in biocrystals. Terahertz circular dichroism peaks between 0.2 and 2.0 THz clearly identify the chirality of these phonons in various microcrystalline and nanofibrils of biomolecules.
Researchers demonstrate a topological-cavity surface-emitting laser with a 10 W peak power and sub-degree beam divergence at 1,550 nm wavelength. The system is also capable of multiple-wavelength arrays.
Researchers demonstrate electrically controllable chirality by exploiting doping-dependent valley polarization of excitonic states in monolayer tungsten diselenide.
Harnessing birefringence in a photonic chip featuring an array of coupled waveguides brings new opportunities for investigating quantum effects such as bunching and antibunching.
Recent progress of table-top isolated attosecond light sources is reviewed with a focus on the related technologies for high-average-flux and high-peak-intensity attosecond bursts of light. An outlook on its applications is also provided.
A liquid crystal doped with a diarylethene enantiomer can be switched by light into stable reflection states of different colour, creating new opportunities for lasing and labelling.
Chiral liquid-crystal materials with optical properties that can be tuned, erased and reversed offer new opportunities in labelling, displays and anti-counterfeiting.
The demonstration of high-efficiency coherent microwave-to-optics conversion could push atomic transducers closer to practical applications in quantum technologies.
The field of flat lens research brings innovative nanophotonic design concepts to the world of macro-optics. However, when evaluating the performance of these lenses a lack of consistency prevents proper comparison of competing technologies. This problem can be solved by using methods developed in industry for conventional lenses.
A photonic anomalous Floquet insulator is emulated in a silicon photonic chip. Up to four-photon topologically protected entangled states are generated in a monolithically integrated emitter in ambient conditions through four-wave mixing on top of the edge modes of the insulator.
Attosecond-gated interferometry is developed by combining sub-cycle temporal gating and extreme-ultraviolet interferometry. By measuring the electron’s relative phase and amplitude under a tunnelling barrier, the quantum nature of the electronic wavepacket is identified.
Directional control of the diffusion of excitons is desired for excitonic devices, but being neutrally charged they can’t be transported by applying a bias voltage as for conventional electronic transport. It is now shown that surface acoustic waves can direct the flux of excitons over micrometre distances, even at room temperature.
A custom-designed metasurface for sample illumination and light collection in optical coherence tomography overcomes the usual trade off in lateral resolution and depth of field.
Researchers exploit Rayleigh waves and associated dynamic strains to control exciton transport in the weak coupling regime at room temperature. The findings may pave the way for new types of excitonic device for applications ranging from communications to energy.
