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A broadband multi-frequency Fabry–Pérot laser diode, when coupled to a high-Q microresonator, can be efficiently transformed to an ~100 mW narrow-linewidth single-frequency light source, and subsequently, to a coherent soliton Kerr comb oscillator.
Frequency response shaping of a ‘racetrack’ ring resonator is demonstrated using a double injection configuration. Sinusoidal, triangular, square and other response shapes are shown.
A nonlinear coherent spectroscopy that uses three slightly different repetition-rate frequency combs is demonstrated. A 2D spectrum with comb resolution is generated using only 365 milliseconds of data, almost 600 times faster than previous approaches.
Optical non-reciprocity is experimentally realized with Rb atoms embedded in a ring cavity at room temperature. Random thermal motion of the atoms causes the probe-direction-dependent response assisted by a unidirectional control laser field.
An integrated silicon photonic optical gyroscope achieves two orders of magnitude size reduction and a factor of thirty better phase-shift sensitivity using reciprocal sensitivity enhancement.
Synchronization of two optical microresonator frequency combs coupled over distances larger than 20 metres is experimentally realized, opening up applications of microresonator combs and offering a chip-based photonic platform for exploring complex nonlinear systems.
A linear frequency conversion based on the sudden merging of two distinct split-ring resonators into a single resonator on a rapidly time-variant THz metasurface is reported.
Up to three distinct frequency combs are simultaneously generated from an optical microresonator and a continuous-wave laser, enabling the deployment of dual- and triple-comb-based methods to applications unachievable by current technologies.
Perovskite quantum dots (QDs) are synthesized via an anion-exchange process where CsPbBr3 is used to realize a highly efficient red light-emitting diode (LED). The perovskite QD-based LED exhibits the highest external quantum efficiency of more than 20% compared with perovskite LEDs.
Coherent extreme-ultraviolet emission through frustrated tunnelling ionization is observed from He atoms excited by intense few-cycle infrared laser pulses. Its intensity depends on the ellipticity and the carrier-envelope phase of the infrared laser.
Transmitters and receivers based on plasmonic internal-photoemission detectors are developed for optoelectronic terahertz signal processing and monolithically integrated on a silicon chip. Proof-of-concept experiments are demonstrated.
Non-reciprocal single-sideband modulation and mode conversion are realized in a low-loss integrated silicon waveguide, enabling >125 GHz operation bandwidths and up to 38 dB of non-reciprocal contrast between forward- and backward-propagating waves.
Terahertz (THz) spectroscopy based on a single-molecule transistor detects a THz-induced centre-of-mass oscillation of a fullerene molecule. Its sensitivity is so high that the spectrum changes on adding (removing) an electron to (from) the molecule.
Black phosphorus/molybdenum disulfide mid-wave infrared photodiodes with external quantum efficiencies of 35% across 2.5–3.5 μm at room temperature and a peak detectivity of 1.1 × 1010 cm Hz1/2 W–1 at 3.8 μm are demonstrated.
Broadband terahertz (THz) pulses are generated from a laser filament with a near-infrared laser at the fundamental frequency and its second harmonic. The azimuthal angle and ellipticity of the THz pulses are arbitrarily controlled by the two lasers.
By selectively erasing the nonlinear coefficients in a lithium niobate crystal using a femtosecond laser, a 3D nonlinear photonic crystal, with an effective conversion efficiency comparable to that of the typical quasi-phase-matching processes, is demonstrated.
A fully programmable two-qubit quantum processor with more than 200 components is demonstrated by using silicon photonic circuits. A two-qubit quantum approximate optimization algorithm and simulation of Szegedy quantum walks are implemented.
By folding large spaces in time using an off-resonant Fabry–Pérot cavity in camera sensors, new capabilities such as ultrafast multi-zoom imaging and ultrafast multispectral imaging, of use for time-resolved imaging and depth-sensing optics, are found.
Spin-polarized photon absorption and photoluminescence are reported in reduced-dimensional chiral perovskite materials. The finding indicates that such materials may in the future be useful as a photonic interface for spintronics.