Researchers in Japan showed that growing Eu-doped GaN on a semipolar GaN plane selectively forms highly efficient Eu luminescent centers while suppressing inefficient Eu clusters. The approach increased room-temperature red emission by 3.6 times, reduced efficiency droop, and points to brighter, wavelength-stable red LEDs for monolithically integrated full-color micro-LED displays using the GaN materials platform.

Researchers from the School of Electronic Science and Engineering at Southeast University, led by Prof. Zhenhua Ni and Prof. Junpeng Lu, have developed a pioneering computational spectrometer recently published in PhotoniX. The device utilizes a silicon photonic "Vernier Caliper" concept to overcome the fundamental trade-off between device footprint, bandwidth, and resolution. Operating within an ultra-compact footprint of only 55*35 µm², the spectrometer achieves an expansive bandwidth exceeding 160 nm and an average algorithm-enhanced spectral resolution of 1.35 pm. This performance establishes a record-breaking bandwidth-to-resolution-to-footprint ratio of over 61.5 µm^-2, demonstrating a significant advance for integrated spectrometers.

This breakthrough is achieved through a deep co-design of photonic hardware and computational science, moving beyond simple algorithmic compensation. The hardware architecture features cascaded Trapezoidal Subwavelength Grating Microring Resonators (TSWG-MRRs) that utilize dispersion engineering to suppress resonant periodicity. This deterministic design allows the device to scan a working window over 16 times larger than a standard microring's free spectral range. The system treats the intrinsic resonance peaks as orthogonal measurement bases and integrates an Nvidia Jetson GPU-accelerated unit to achieve real-time reconstruction. The team successfully resolved 49 absorption lines of hydrogen cyanide (H¹³C¹⁴N) with an accuracy exceeding commercial benchtop optical spectrum analyzers, validating its potential for gas sensing, chemical analysis, and lab-on-a-chip applications.

As the AI era accelerates the demand for advanced semiconductor packaging, a global joint research team has developed an Ultrafast Laser Chemical Vapor Deposition (ULCVD) technique. This breakthrough enables maskless, 3D direct-write patterning of highly conductive carbon circuits on all surfaces of transparent glass substrates, solving critical metallization challenges for Through-Glass Vias (TGV) and Redistribution Layers (RDL).

Mosquitoes have a specialized organ called Johnston’s organ, which sits at the bottom of their antennae, detects vibrations, and generates its own oscillations, thereby amplifying signals for the mosquito’s detection. The antennae are also segmented and covered with fine hairs, which makes them flexible to a wide range of frequencies and more sensitive to air vibrations. Inspired by these concepts, researchers have created a sensor that works without amplification circuits or signal processing and filtering and enhances vibration signals, simply based on the geometry of the device.

Tree shade is one of the fastest ways to make heat more bearable. It cuts direct sunlight, protects people walking or working outdoors, and remains essential for Heat Action Plans. A new study, published in Nature Communications by researchers from the Indian Institute of Technology Gandhinagar (IITGN), adds a sharper planning question: if greening is so important, why does the same strategy cool some urban areas more reliably than others?