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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.
Two types of on-chip silicon device utilizing silicon T centres are developed: an O-band light-emitting diode and an electrically triggered single-photon source. Further, a new method of spin initialization with electrical excitation is demonstrated.
An optical sieve—an array of optically resonant voids in gallium arsenide—enables sorting, detecting and counting nanoplastics as small as a few hundreds of nanometres at concentrations as low as 150 μg ml−1 in lake water samples.
A tree-like arrangement of dichroic mirrors and multiple cameras coupled with an iterative spectral unmixing algorithm enables multispectral imaging of live cells in up to eight spectral channels with diffraction-limited spatial resolution and temporal resolution of 0.3 s for imaging a full cell volume.
This Perspective offers practical guidelines for the optical characterization of chiral materials, aiming to improve the consistency and reproducibility of experimental results.
The quantum nature of light has been harnessed in a photonic chip to perform machine-learning tasks. For specifically designed problems, the approach outperforms established classical methods.
The integration of a quantum emitter-embedded metasurface (QEMS) with a microelectromechanical system (MEMS)-actuated cavity enables ångstrom-level wavelength tuning and dynamic polarization-resolved emission. The platform provides a design paradigm for reconfigurable solid-state photon sources.
Shaping the polarization state of ultrashort pulses in the extreme ultraviolet (XUV) range is challenging, owing to the lack of suitable materials for controlling the phase of the radiation. However, an approach using seeded free-electron lasers operating in the XUV wavelength regime now makes it possible to synthesize pulses with spatially dependent polarization states.
