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Spatial light modulator-based lithography-free programmable light transmission through optical gain medium is demonstrated for optical switching and a rudimentary photonic neural network.
Researchers engineer double-tapered optical-fibre arrays and use perovskite nanocrystal substrates for X-ray imaging with a three orders of magnitude output gain and spatial resolution of 22 lp mm−1. Arrayed gamma-ray imaging is also demonstrated using a nanocrystal scintillator film.
Multiple scattering from birefringent nanospheres confers brilliant whiteness to parts of the Pacific cleaner shrimp, inspiring new ways to achieve broadband reflection with thin layers of material.
The strong birefringence of liquid crystalline nanospheres in the body of the Pacific cleaner shrimp enables brilliant whiteness by overcoming undesirable optical crowding effects.
A passively mode-locked quantum cascade laser (QCL) is developed by employing a heterogeneous gain medium and integrating graphene saturable absorbers along the entire QCL waveguide. Self-starting optical pulses of 4.0 ps are electrically generated in the 2.30–3.55 THz frequency range.
The dipole-dependent propagation of hybrid excitons in a van der Waals heterostructure containing a WSe2 bilayer is characterized by modulating the layer hybridization and interplay between many-body interactions of excitons with an applied vertical electric field.
Joint force measurements with entangled optical probes on two optomechanical sensors are demonstrated. The force sensitivity is improved by 40% in the shot-noise-dominant regime. The sensing bandwidth is improved by 20% in the thermal noise limit.
Ultrathin 10.2-nm-thick (~λ/30,000) Ti3C2Tx MXene assemblies that offer an absorption of 49.2%, which is close to the theoretical limit of 50%, in the range of 0.5–10 THz are reported, benefiting terahertz optoelectronic and photothermoelectric devices.
An electrically driven on-chip light source of entangled photon pairs is developed by combining an InP gain section and Si3N4 microrings. A pair generation rate of 8,200 counts s−1 and a coincidence-to-accidental ratio of more than 80 are achieved around the wavelength of 1,550 nm.
Nature Photonics spoke to Hongjie Dai from Stanford University about bioimaging in the second near-infrared (NIR-II) spectral window and its clinical potential.
A three-partite cluster state made of one semiconductor spin and two indistinguishable photons is generated from an InGaAs quantum dot embedded in a pillar microcavity. The three-partite entanglement rate is 0.53 MHz at the output of the device.
This work investigates the real-world value of topological protection in reciprocal photonics. Measurements of propagation losses in the slow-light regime of valley-Hall topological waveguides yield no indications of topological protection against backscattering on structural defects.
A multifunctional additive modulates the kinetics of perovskite film growth, enabling inverted perovskite solar cells with 24.8% power conversion efficiency and enhanced thermal stability.
An entanglement filter based on Rydberg atoms is demonstrated. It transmits a desired photonic entangled state and blocks unwanted ones. Near-perfect photonic entanglement can be extracted from a noisy input with arbitrarily low initial fidelity.
An exact solution for the quantum and private capacities of bosonic dephasing channels is provided. The authors prove that these capacities are equal to the relative entropy of the distribution underlying the channel with respect to the uniform distribution.
All-thermal evaporation enables the fabrication of green perovskite LEDs with a peak external quantum efficiency of 16.4%, and active-matrix displays with high resolution and continuous greyscale information.
Non-Gaussian Wigner-negative freely propagating optical quantum states are deterministically generated with a 60% photon generation efficiency. An evolution from quadrature squeezing to Wigner negativity is observed by changing the qubit rotation angle.
A graph-theoretical programmable quantum photonic device composed of about 2,500 components is fabricated on a silicon substrate within a 12 mm × 15 mm footprint. It shows the generation, manipulation and certification of genuine multiphoton multidimensional entanglement, as well as the implementations of scattershot and Gaussian boson sampling.
