Physics World's 2026 Instrumentation & Vacuum Briefing is now available

Physics World has released its annual "Instrumentation & Vacuum Briefing" for 2026, a free-to-access document covering the latest innovations in scientific instrumentation. The report highlights advancements in various fields, including the application of International System (SI) units, the development of quantum sensors, compact particle acceleration, and significant improvements in radiotherapy techniques. This compendium offers an overview of emerging trends and key technologies expected to shape research and industry in the coming years. The inclusion of quantum sensors underscores the increasing relevance of quantum mechanics in the design of high-precision devices, while compact particle accelerators promise new applications in medicine and materials science. Improvements in radiotherapy, meanwhile, reflect continuous progress in applying physics for more effective and less invasive medical treatments.

Sail membrane optomechanical accelerometers for new physics searches

Researchers have developed a new type of optomechanical accelerometer based on silicon nitride (Si$_3$N$_4$) membranes with a "sail-like" geometry that significantly enhances their performance. These devices combine a low resonant frequency with a high $Q \times \text{mass}$ product, crucial characteristics for detecting minute accelerations. The design, optimized using Bayesian techniques, allows for a reduction in resonant frequency by an order of magnitude while maintaining the quality of the $Q \times \text{mass}$ product, representing a significant advance in the dissipation engineering of these resonators. The developed accelerometers, with a centimeter scale, operate at kilohertz frequencies, achieving quality factors $Q \sim 10^7$ and $Q \times \text{mass} \sim 10 \text{ g}$ products. By vertically integrating a 7 kHz device with a nanoribbon, scientists achieved a monolithic cavity optomechanical accelerometer. This sensor exhibits a room temperature thermal noise of $40 \text{ n}g_0/\sqrt{\text{Hz}}$, which is sufficient to resolve ambient vibrations of the order of $μg_0/\sqrt{\text{Hz}}$ over a 4 kHz bandwidth, with a displacement imprecision of $10^{-14} \text{ m}/\sqrt{\text{Hz}}$. The key to this improvement lies in the optimization of the membrane geometry, transitioning from conventional strained resonators to "trampoline-like" structures with a sail shape. This design enables more efficient dissipation dilution, leading to higher sensitivity and stability. The ability of these accelerometers to detect extremely small accelerations makes them promising candidates for various applications. In the future, the creation of cryogenic arrays of these sail membranes could open new avenues for the search for "new physics" phenomena beyond the Standard Model and for distributed quantum sensing experiments. The combination of high sensitivity, low noise, and potential for scalability makes these devices an attractive platform for fundamental and technological research in quantum metrology.