Nanotechnology World

Metasurfaces are flat, compact devices patterned with nanoscale structures that look like tiny pillars, each of which is precisely engineered to influence light. The Harvard team was among the first to explore the extraordinary physics of visible-spectrum metasurfaces and their potential to revolutionize things like cameras, microscopes, sensors, and communication systems.

For about a decade, researchers have been trapping atoms with what are known as optical tweezer arrays. In essence, a single “optical tweezer” is a tightly focused laser beam that holds an individual atom at its focal point. Tweezer arrays are made up of many individual tweezers, typically generated via spatial light modulators (SLMs) or acousto-optic deflectors (AODs). Using these techniques, a team at Caltech recently achieved arrays with 6,100 trapped atoms and demonstrated that they can successfully function as qubits. “Their report is an amazing achievement,” said Will. “With our metasurface tweezer array approach, we hope to scale neutral-atom arrays even further, perhaps even beyond 100,000 atoms.”

In a landmark achievement at the confluence of artificial intelligence and fundamental physics, a team of researchers from Tongji University, the Chinese university of Hong Kong and Nanyang Technological University has developed an AI algorithm capable of classifying complex topological phases of matter without relying on the mathematical tools that have limited human scientists for decades. This breakthrough, which tackles the notoriously difficult realm of non-Hermitian systems, suggests that AI can not only assist in scientific discovery but can surpass human capabilities in certain domains of abstract reasoning, a notion recently highlighted by the recognition of “AI for Science” in the 2024 Nobel Prizes.

Researchers at Kumamoto University have discovered that a purely inorganic crystal grown from water solution can emit circularly polarized light, a special form of light whose “handedness” distinguishes left from right. The finding opens a new pathway toward robust optical materials for security printing, advanced displays, and photonic technologies, using simple inorganic chemistry rather than complex organic molecules.

The study was reported in Nano Letters, a journal of the American Chemical Society. It was co-authored by Yu’s colleagues at Indiana University and Osaka University in Japan.

For the first time, researchers simultaneously used ultrafast X-rays and electrons to image a shockwave in water, a “multi-messenger” view that reveals details previous experiments couldn’t see. Researchers found an unexpected layer of water vapor made the shockwave symmetric, a feature similar to what happens in certain targets used for inertial confinement fusion. The work shows how researchers can use small-but-mighty systems called laser-plasma accelerators to explore the microphysics of plasmas, advancing fusion energy research.

Researchers at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR) have uncovered previously unobserved oscillation states – so-called Floquet states – in tiny magnetic vortices. Unlike earlier experiments, which required energy-intensive laser pulses to create such states, the team in Dresden discovered that a subtle excitation with magnetic waves is sufficient. This finding not only raises fundamental questions in basic physics but could also eventually serve as a universal adapter bridging electronics, spintronics, and quantum devices. The team reports its results in the scientific journal Science.

In a new study from NAU’s Department of Applied Physics and Materials Science, a group of researchers discovered that similar things happened to their fabricated gold, copper and iron nanocrystals. When the metal particles clumped together during a lightning-fast chemical reaction, they formed pentagonal constructs that strongly resemble natural snowflakes, a phenomenon that holds incredible implications for the future of nanotechnology.

In the future, quantum computers are anticipated to solve problems once thought unsolvable, from predicting the course of chemical reactions to producing highly reliable weather forecasts. For now, however, they remain extremely sensitive to environmental disturbances and prone to information loss. A new study from the lab of Dr. Yuval Ronen at the Weizmann Institute of Science, published in Nature, presents fresh evidence for the existence of non-Abelian anyons – exotic particles considered prime candidates for building a fault-tolerant quantum computer. This evidence was produced within bilayer graphene, an ultrathin carbon crystal with unusual electronic behavior.

To address this challenge, Professor Zhao’s research team has developed a nano-printing platform to demonstrate the world’s smallest fully printed infrared photodetectors—marking a significant advancement in optoelectronic device fabrication.

Now, however, researchers at ETH Zurich and the Max Planck Institute for the Structure and Dynamics of Matter in Hamburg have shown that the electrons in certain materials respond with a delay. Moreover, this delay depends on where the electrons are localized and which energy state they occupy.

The printed microscale helixes reliably create circularly polarized beams in the THz range and, when arranged in patterned arrays, can function as a new type of Quick Response (QR) for advanced encryption/decryption. Their results, published in Advanced Science, represent the first full parametric analysis of helical structures for THz frequencies and show the potential of 3D printing for fabricating THz devices.

In a new Nature Physics study, researchers created particle-like so-called “vortex knots” inside chiral nematic liquid crystals, a twisted fluid similar to those used in LCD screens. For the first time, these knots are stable and could be reversibly switched between different knotted forms, using electric pulses to fuse and split them.

When two black holes merge or two neutron stars collide, gravitational waves can be generated. They spread at the speed of light and cause tiny distortions in space-time. Albert Einstein predicted their existence, and the first direct experimental observation dates from 2015. Now, Prof. Ralf Schützhold, theoretical physicist at the Helmholtz-Zentrum Dresden-Rossendorf (HZDR), is going one step further. He has conceived an experiment through which gravitational waves can not only be observed but even manipulated. Published in the journal Physical Review Letters, the idea could also deliver new insights into the hitherto only conjectured quantum nature of gravity.

Visible light can be used to create electrodes from conductive plastics completely without hazardous chemicals. This is shown in a new study carried out by researchers at Linköping and Lund universities, Sweden. The electrodes can be created on different types of surfaces, which opens up for a new type of electronics and medical sensors.

The group’s MOCHI material is a silicone gel with a twist: The gel traps air through a network of tiny pores that are many times thinner than the width of a human hair. Those tiny air bubbles are so good at blocking heat that you can use a MOCHI sheet just 5 millimeters thick to hold a flame in the palm of your hand.

Researchers from TU Delft and Radboud University have discovered that the two-dimensional ferroelectric material CuInP₂S₆ (‘CIPS’) can be used to control the pathway and properties of blue and ultraviolet light like no other material can. With ultraviolet light being the workhorse of advanced chipmaking, high-resolution microscopy and next-generation optical communication technologies, improving the on-chip control over such light is vital. As the researchers describe in the journal Advanced Optical Materials, CIPS can be integrated onto chips, opening exciting new avenues for integrated photonics.