compact
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Physics
Researchers develop a compact, super-radian Smith pull-cell device with ultra narrow line width
Schematic diagram of a pump-induced stimulus superradiation Smith Pull Cell Radiation (PIS-SPR) device. Based on PIS-SPR, the free electron beam is well bundled and ultra-narrow spectral line widths in the THZ frequency domain have been observed. Credit: Elight (2025). doi:10.1186/s43593-025-00083-z Superradiation Smith Pull Cell Radiation (S-SPR) is a type of free electron emission with a sequence of free electron fluxes…
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Physics
Twisted Light: A new metasurface offers a compact solution for circularly polarized light
Generation of circularly polarized nonlinear signals from rotationally symmetric chiral metasurfaces under arbitrary polarization excitation. Credit: SUTD Left and right circularly polarized light, in which electromagnetic waves spiral clockwise and counterclockwise, plays an important role in a wide range of applications, from enhancing medical imaging technology to enabling advanced communication technologies. However, generating circularly polarized light often requires complex and…
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Physics
Compact all-fiber photoacoustic spectrometer for intravascular gas detection comparable to laboratory-based systems
Fiber photoacoustic spectrometer allows continuous intravascular gas monitoring. Credit: Jun Ma (Jinan University) Compact spectroscopic systems capable of detecting trace concentrations at parts per billion (ppb) levels are of paramount importance in applications ranging from environmental monitoring and industrial process control to biomedical diagnostics. However, existing benchtop spectroscopy systems are too large, complex, and impractical for use in confined spaces.…
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Physics
Metalens uses AI to enable high-resolution, full-color imaging of compact optical systems
A metalens, consisting of an array of nanostructures with arbitrary rotation angles, captures the image, which is then reconstructed to produce an output image that closely approximates the quality of the original “ground truth” image. Credit: Advanced Photonics (2024). DOI: 10.1117/1.AP.6.6.066002 Modern imaging systems, such as those used in smartphones, virtual reality (VR), and augmented reality (AR) devices, are constantly…
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