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The temporal characterization of few-femtosecond vacuum ultraviolet pulses bring new opportunities for investigating ultrafast light-matter interactions.
Combining a low-coherence source with silicon nitride ring resonators featuring normal group velocity dispersion enables electrically pumped, high-power microcombs, providing on-chip power up to 158 mW and high-coherence comb lines with linewidths as narrow as 200 kHz.
A central goal of topological photonics has been to develop compact isolators using protected, non-reciprocal edge states. A recent demonstration of a ferrite-based microwave isolator leverages the magnon-induced topological photonic bandgap to achieve over 100 dB of isolation in a device smaller than a single free-space wavelength.
A new imaging platform combines a high-speed, multichannel camera system with an iterative spectral unmixing algorithm, enabling high-resolution imaging of up to seven distinct fluorophores, even under challenging live-cell conditions.
Electrically induced single-photon emission and spin initialization of a silicon T centre in photonic structures is a promising step towards integrated spin–photon interfaces for quantum networks.
Single-chain polymer dots used as ultrasmall fluorescent probes enable nanometre-resolution imaging and are capable of tracking kinesin-1 stepwise motion in living cells using a standard spinning-disk confocal microscope.
The high-contrast dielectric boundary between a gold–air hybrid structure and its sharp spatial features are exploited to provide the momentum required for the excitation of higher-order hyperbolic phonon polaritons.
A miniaturized ultraviolet spectral imager based on a cascaded AlGaN/GaN photodiode with a compositionally graded active region enables spectral imaging in the 250–365 nm range. The device allows the classification of different types of organics, such as oils and milk, in a single-shot imaging modality.
Thermodynamic-like phenomena in optics are a nascent yet elusive route to control light flow. By emulating Joule–Thomson expansion in synthetic photonic lattices, it is now possible to funnel light universally into a single output, regardless of the input.
By exploiting an optical thermodynamic framework, researchers demonstrate universal routing of light. Specifically, light launched into any input port of a nonlinear array is universally channelled into a tightly localized ground state. The principles of optical thermodynamics demonstrated may enable new optical functionalities.
This Review highlights chip-scale superconducting coherent photon source technologies and their rich potential as an important integrated quantum hardware to advance quantum information processing and communication networks.
Although typical microwave isolators provide 20 dB of isolation, a topological isolator—based on a one-way edge waveguide—enables 100 dB isolation due to the near-complete absorption of the backward-propagating mode. In theory, 200 dB of isolation is possible within a single-wavelength-size device.
A terahertz field exceeding 1 V nm−1 induced a structural phase transition in the top atomic layer of a bulk WTe2 crystal. Differential imaging revealed a surface shift of 7 ± 3 pm and an electronic signature consistent with a topological phase transition.
Organic permeable base transistors featuring a porous aluminium electrode within the semiconductor channel enable high photo-gain and charge storage simultaneously. The transistors achieve retention times beyond 10.000 s while operating at less than 2 V with responsivity as high as 109 A W−1.
Using low-threshold and dispersion engineering, a 2.6-octave frequency comb is generated on a LiNbO3 chip via an optical parametric oscillator with only 121 fJ. The optical parametric oscillator design eases the requirements for quality factor and relatively narrow spectral coverage of the cavity.
