Understanding the Physical Upper Limit of Viscosity

Scientific Frontline: Extended "At a Glance" Summary: Viscosity Upper Limit

The Core Concept: Researchers have identified a practical upper bound for material viscosity, estimated at \(10^{30 \pm 2}\) Pa s, beyond which substances function as essentially rigid bodies over finite timescales.

Key Distinction/Mechanism: Unlike classical assumptions of infinite viscosity for solid materials, this study establishes a finite quantitative threshold determined by the convergence of geodetic, experimental, and numerical simulation data.

Major Frameworks/Components:

• Geodetic observations of tectonic plate stability.
• Laboratory-derived flow laws for major rock-forming minerals, including olivine, clinopyroxene, diopside, anorthite, and quartz.
• Numerical simulations of mantle convection and visco-elasto-brittle deformation.

Little Red Dots and Cosmic Neutrinos

At the center of the Little Red Dot, there may be a black hole surrounded by a thick outer gaseous envelope. In this environment, photons produced near the center are absorbed and scattered by the gas, so neutrinos can escape the envelope without interacting with the surrounding gases. If there are many Little Red Dots, they may account for a part of the high-energy neutrinos arriving from the universe.
 Image Credit: KyotoU / Riku Kuze

Scientific Frontline: Extended "At a Glance" Summary: Little Red Dots as Hidden Neutrino Sources

The Core Concept: "Little Red Dots" are abundant, high-redshift, small red galaxies recently observed by the James Webb Space Telescope. Researchers hypothesize that these galaxies harbor growing supermassive black holes enveloped in dense gas, making them a primary candidate for the universe's mysterious all-sky high-energy neutrino background.

Key Distinction/Mechanism: High-energy neutrinos are produced when accelerated particles collide with surrounding matter or photons. Unlike typical high-energy neutrino sources, which also emit detectable gamma rays, the dense gaseous envelopes surrounding the black holes in Little Red Dots suppress gamma-ray emissions while allowing neutrinos to escape, thereby matching observed cosmic background levels.

Major Frameworks/Components:

• Supermassive Black Holes: Central celestial objects generating the extreme energetic forces required for particle collisions.
• Particle Acceleration: The mechanism by which protons and other particles achieve high velocities within buried jets, leading to the production of secondary particles.
• Gaseous Envelopes: Thick, dense layers of gas surrounding the central black hole that absorb scattered photons (gamma rays) while permitting electrically neutral neutrinos to escape.
• Neutrino Spectrum Analysis: Complex numerical modeling utilized to evaluate cooling processes, particle collisions, and the expected neutrino output from these distant galaxies.

AI Unlocks New Superconductors

\(\mathrm{YRu}_3\mathrm{B}_2\) and \(\mathrm{Lu}_3\mathrm{B}_2\) gain their superconductivity from electrons forming flat bands in a kagome lattice, named after a hexagonal Japanese basket-weaving pattern.
Photo Credit: Esa Kapila

Scientific Frontline: Extended "At a Glance" Summary: Machine Learning in Superconductor Discovery

The Core Concept: Researchers have utilized machine-learning algorithms to identify two new superconductive materials, \(\mathrm{YRu}_3\mathrm{B}_2\) and \(\mathrm{Lu}_3\mathrm{B}_2\), demonstrating a novel methodology to rapidly filter practically infinite elemental combinations. The superconductivity of these materials arises from electrons forming flat bands within a specific geometric atomic structure.

Key Distinction/Mechanism: Unlike traditional superconductor discovery, which has historically relied on serendipity or computationally exhaustive processes, this new framework deploys a machine-learning-based pre-screening process to filter billions of candidates before executing targeted calculations and physical synthesis.

Major Frameworks/Components: 

• Machine-Learning Pre-screening: Advanced algorithms capable of computationally processing and filtering billions of potential elemental combinations to find viable material candidates.
• Quantum Geometry: The theoretical and mathematical foundation used to model the quantum properties and viability of the pre-screened combinations.
• Kagome Lattice: A distinct structural atomic arrangement, mirroring a traditional Japanese hexagonal basket-weaving pattern, that facilitates the flat electron bands necessary for superconductivity in \(\mathrm{YRu}_3\mathrm{B}_2\) and \(\mathrm{Lu}_3\mathrm{B}_2\).

Manganese Spintronics: Light-Switched Data Storage

A coin-sized area of the new material is illuminated through a mask: The spins change their state, and the material changes color.
Illustration Credit: ©: Katja Heinze / JGU

Scientific Frontline: Extended "At a Glance" Summary: Switching Spin States in Manganese Ions

The Core Concept: Researchers have synthesized a novel manganese-based molecular material that allows for the stable switching of electron spin states using light, functioning as a highly compact data storage device.

Key Distinction/Mechanism: Unlike traditional iron-containing molecular memory devices that max out at temperatures around 130 Kelvin, this new material utilizes manganese. By combining manganese ions with N-heterocyclic carbene ligands, the strong chemical bond stabilizes the low-spin state and creates a high energy barrier. When irradiated with light, the electrons change spin states (shifting the material's color from dark red to light yellow), and thes magnetic data persists at higher temperatures (approximately minus 132 degrees Celsius) even after the light source is removed.

Major Frameworks/Components:

• Spintronics: The study and exploitation of the intrinsic spin of the electron and its associated magnetic moment for solid-state devices.
• Binary Spin States: The alignment of individual electron spins in either a parallel (high-spin) or antiparallel (low-spin) configuration, acting as digital "1s" and "0s."
• N-Heterocyclic Carbene Ligands: Specific chemical ligands used to bind strongly to the manganese ions, thereby widening the energy barrier between the distinct spin states.
• Photomagnetic Relaxation/Switching: The mechanism by which incoming light is utilized to physically alter the electron spin states and write digital information into the material.

Automated Semiconductor Defect Detection

Rice doctoral alumna Tia Gray holding a sample of selectively grown diamond microstructure in the shape of an owl.
Photos Credit: Brandon Martin/Rice University

Scientific Frontline: Extended "At a Glance" Summary: Automated Defect Detection in Advanced Semiconductors

The Core Concept: Materials scientists have developed a custom, Python-based software workflow to rapidly analyze high-resolution X-ray diffraction data, successfully measuring microscopic defects in diamond and other wide-bandgap semiconductors.

Key Distinction/Mechanism: Rather than relying on time-consuming and labor-intensive manual analysis, this approach utilizes automated software to process X-ray diffraction patterns. It rapidly identifies structural irregularities and calculates the precise density of atomic lattice dislocations across diverse crystal structures.

Major Frameworks/Components:

• High-resolution X-ray diffraction (HRXRD) analysis.
• Custom Python-based automation and data processing software.
• Lattice dislocation density calculation modeling.
• Wide-bandgap semiconductor evaluation protocols (specifically focusing on synthetic single-crystal diamond and gallium nitride).

Janus 2D Semiconductors: Synthesis Physics Solved

An image of the Janus formation reaction in which the outermost chalcogen atom in an atomic layer material is replaced by another chalcogen atom with the support of electron accumulation.
Image Credit: ©Toshiaki Kato

Scientific Frontline: Extended "At a Glance" Summary: Janus Two-Dimensional Semiconductors

The Core Concept: Janus two-dimensional (2D) semiconductors are asymmetrical materials featuring top and bottom surfaces composed of different elements. This structural asymmetry generates a robust internal electric field, making the materials highly reactive and versatile for technological applications.

Key Distinction/Mechanism: While atom substitution traditionally requires immense heat, Janus materials can be synthesized efficiently at room temperature via plasma treatment. The mechanism relies on electrons from the plasma accumulating at the interface between the 2D material and its substrate, which weakens chemical bonds and significantly lowers the activation energy required for the selective replacement of top-layer chalcogen atoms.

Major Frameworks/Components:

• In-Situ Optical-Electrical Measurement: A newly developed monitoring system utilized to observe structural and electrical changes in real time during plasma treatment.
• The Electron Accumulation Model: A theoretical framework demonstrating that excess accumulated electrons at the substrate interface drive the room-temperature substitution process.
• Ultraviolet Light Acceleration: The application of UV light to increase electron accumulation, a process shown to accelerate the substitution reaction by more than twofold.
• First-Principles Calculations: Computational methods utilized to successfully validate the electron accumulation theory and formalize the predictable synthesis model.

Quantum Mechanics Without Imaginary Numbers

Explanatory diagram for the research question – is quantum mechanics possible with only real numbers? – and results of the study.
Image Credit: © HHU / Pedro Barrios Hita

Scientific Frontline: Extended "At a Glance" Summary: Real-Number Quantum Mechanics

The Core Concept: Quantum mechanics, the physical theory describing the behavior of atomic and subatomic particles, can be successfully formulated using solely real numbers. This mathematically rigorous alternative challenges the traditional reliance on complex numbers, which incorporate both real and imaginary components, to describe quantum states.

Key Distinction/Mechanism: Standard quantum mechanics uses complex numbers where a state's amplitude is represented by the real part and its phase by the imaginary part. By utilizing a physically motivated, less restrictive postulate for system composition, researchers have developed an alternative framework that strictly uses real numbers while remaining experimentally indistinguishable from standard quantum mechanics.

Origin/History: The development of quantum mechanics began in the 1900s through the foundational work of physicists such as Max Planck, Niels Bohr, Werner Heisenberg, and Erwin Schrödinger. The modern debate over the mathematical necessity of imaginary numbers was highlighted by a 2021 study declaring them essential, which was subsequently overturned in 2026 by physicists from Heinrich Heine University Düsseldorf and the German Aerospace Center.

Limnology: In-Depth Description

Photo Credit: Claudia Chiavazza

Limnology is the comprehensive scientific study of inland aquatic ecosystems, focusing on both natural and man-made bodies of water. This discipline encompasses lakes, reservoirs, ponds, rivers, streams, wetlands, and groundwater. The primary goal of limnology is to understand the complex interactions between the physical, chemical, and biological components of these ecosystems, elucidating how they function, how they change over time, and how they respond to environmental stressors and human activities.

Biophotonics: In-Depth Description

Biophotonics is the interdisciplinary applied science of generating, manipulating, and utilizing photons to image, identify, and engineer biological materials at the molecular, cellular, and tissue levels. The primary goal of this field is to harness the unique properties of light to non-invasively probe biological functions, detect diseases in their nascent stages, and develop targeted therapeutic interventions without compromising the structural integrity of the living systems under investigation.

Dark Matter & Galactic Center Excess

An image of the excess of gamma rays that occurs at the center of our Milky Way superimposed with an optical image of the galaxy. The cause of this excess and whether it could have come from dark matter has been debated for over a decade.
Image Credit: NASA Goddard/A. Mellinger (Central Michigan Univ.) and T. Linden (Univ. of Chicago).

Scientific Frontline: Extended "At a Glance" Summary: Galactic Center Excess and Dark Matter

The Core Concept: The Galactic Center Excess (GCE) is an unexplained, roughly spherical glow of massive gamma-ray emissions originating from the center of the Milky Way galaxy.

Key Distinction/Mechanism: While previous models leaning toward stellar sources lacked individual photon energy data, a newly developed machine-learning method incorporates this spectral information. The analysis reveals that if the GCE is caused by neutron stars, there must be at least 35,000 extremely faint sources, making their collective signal nearly indistinguishable from self-annihilating dark matter.

Major Frameworks/Components:

• Self-Annihilating Dark Matter: A theoretical model postulating that dark matter particles collide and destroy one another, producing the detectable gamma-ray glow.
• Millisecond Pulsars: The primary alternative hypothesis attributing the excess radiation to a massive, unresolved population of rapidly spinning, dense neutron stars.
• Machine-Learning Spatial-Spectral Analysis: A novel computational framework trained on over a million simulated observations to simultaneously evaluate spatial data and individual photon energies.

Computational Chemistry: In-Depth Description

Computational chemistry is a vital sub-discipline of chemical science that leverages advanced mathematical algorithms, computer software, and theoretical physics to simulate, predict, and analyze molecular structures, dynamic behaviors, and material properties. Its primary goal is to translate the fundamental laws of quantum and classical mechanics into functional computational models. By doing so, it allows scientists to explore complex chemical phenomena that may be too rapid, hazardous, or challenging to observe directly in a laboratory setting, while also guiding experimentalists toward promising discoveries prior to physical synthesis.

Hardy Ice Plant Optics: Biomimetic Materials

Petals that Reflect: Parabolic Surface Structures in the Hardy Ice Plant
Microscopic parabolic ridges in the hardy ice plant’s petals create a natural glossy effect by controlling light reflection.
Image Credit: Professor Hiroshi Moriwaki from Shinshu University, Japan

Scientific Frontline: Extended "At a Glance" Summary: Biomimetic Optics of the Hardy Ice Plant

The Core Concept: The hardy ice plant (Delosperma cooperi) possesses microscopic parabolic surface grooves on its petals that manipulate light to produce a striking, pigment-free glossy appearance. This structural optic phenomenon allows the plant to scatter and directionally reflect light across a broad range of viewing angles.

Key Distinction/Mechanism: Unlike plants that generate gloss through thin-film interference, surface waxes, or prism-like structures, the hardy ice plant utilizes a specialized parabolic surface architecture. The front surface of the petal broadly scatters light akin to a traffic mirror, while the back surface concentrates light that has passed through the upper layer.

Major Frameworks/Components:

• Structural Coloration: The principle that physical microscopic geometries, rather than chemical pigments or waxes, dictate optical behaviors like light reflection, absorption, and scattering.
• Advanced Metrology: The employment of scanning electron microscopy (SEM), confocal laser microscopy, and angle-dependent reflectance measurements to isolate and map the parabolic geometries.
• Biomimetic Replication: The use of silicone molds and UV-curable resin to synthetically reproduce the petal's biological optical architecture for materials testing.

Macroscopic Quantum Entanglement Explained

Proof of quantum effects in a strange metal
Image Credit: © TU Wien / Harald Ritsch

Scientific Frontline: Extended "At a Glance" Summary: Macroscopic Quantum Entanglement (Schrödinger's Anthill)

The Core Concept: For the first time, physicists have detected a high degree of multipartite quantum entanglement within a macroscopic, centimeter-sized crystal of a "strange metal." This demonstrates that massive objects made of countless particles can collectively exhibit fundamental quantum effects.

Key Distinction/Mechanism: Rather than attempting to force an entire object into a superposition state (akin to the theoretical Schrödinger's cat), researchers measured the material's sensitivity to neutron bombardment. Using a metric called quantum Fisher information, they found that the material responds to disturbances collectively—much like a disturbed anthill—with groups of at least nine particles acting as single, quantum-entangled entities rather than independent atoms.

Major Frameworks/Components:

• Quantum Fisher Information: A theoretical tool from quantum information science used to quantify the sensitivity of a many-body system to external changes, directly indicating its degree of entanglement.
• Strange Metals: A complex class of materials (in this experiment, a crystal of cerium, palladium, and silicon) known for highly unusual quantum properties, such as suppressing electrical current fluctuations.
• Neutron Scattering: An experimental technique where neutrons are fired at the crystal to observe the transfer of energy and measure the resulting collective particle response.

Urban Heat Mitigation & Vertical Greenery

Urban Heat Island mitigation strategy
Green wall installation can provide cooling effects for both indoor and outdoor environments.
Image Credit: Osaka Metropolitan University

Scientific Frontline: Extended "At a Glance" Summary: Urban Heat Island Mitigation Strategies (UHIMS)

The Core Concept: Urban Heat Island Mitigation Strategies (UHIMS) encompass ecological and architectural interventions—such as vertical greenery and reflective surfaces—designed to reduce extreme localized temperatures in urban environments by managing how building envelopes interact with local microclimates.

Key Distinction/Mechanism: Unlike traditional approaches that isolate indoor air conditioning or outdoor shading, advanced UHIMS operate dynamically across the building envelope. By utilizing vertical greenery and targeted surface albedo (reflectivity), these strategies simultaneously cool indoor spaces and outdoor immediate environments without relying on active electrical grids.

Major Frameworks/Components:

• Building Energy Model (BEM): A simulation framework used to reproduce, analyze, and predict indoor thermal conditions and overall energy performance.
• Urban Microclimate Model (UMM): A spatial analytical tool utilized to capture outdoor microclimate dynamics and environmental interactions.
• Physiologically Equivalent Temperature (PET): A standardized bioclimatic metric used to consistently assess human thermal comfort across both indoor and outdoor settings.
• Surface Albedo Modulation: The strategic use of surface reflectivity, where high-albedo materials reduce indoor temperatures, and low-albedo exterior surfaces enhance localized outdoor thermal comfort.

Controlling Hidden Quantum Phases with Ultrafast Light

NSLS-II scientists (left to right) Jiemin Li, Larry Carr, Valentina Bisogni, Brandon Yalin, Jonathan Pelliciari, and Taehun Kim convene at the Soft Inelastic X-ray Scattering beamline, where they discovered a hidden material phase.
Photo Credit: Kevin Coughlin/Brookhaven National Laboratory

Scientific Frontline: Extended "At a Glance" Summary: Hidden Quantum Phases

The Core Concept: Scientists at Brookhaven National Laboratory have demonstrated a method to drive quantum materials into a "hidden" state of matter by using ultrafast laser pulses to trigger a nonthermal transition from an insulator to a conductor.

Key Distinction/Mechanism: Unlike traditional thermal heating, which often degrades delicate quantum behavior by inducing bulk phase changes, this nonthermal approach selectively switches a material's state at the electronic level while preserving its underlying quantum character.

Major Frameworks/Components:

• Magnetoresistive Manganites: The primary class of quantum materials utilized for their sensitivity to external stimuli.
• Ultrafast Laser Pulses: 100-femtosecond bursts of light used to induce phase switching without excessive bulk heating.
• Resonant Inelastic X-ray Scattering (RIXS): A high-resolution technique used to probe the material's electronic structure changes in situ.
• X-ray Absorption Spectroscopy (XAS): Employed alongside RIXS to map the evolution of the material's electronic state.

Metallic State Survival in Yb2CsC60 Fulleride

Evolution of the structural and electronic properties of molecular fullerides with change in valence state
   Despite the presence of strong correlations, the newly synthesized fulleride (box) continues to behave like a weak metal, by passing the transition to an insulating state and continuing to conduct electrons, even when reduced to cryogenic temperatures. Other materials are shown for comparison.   
Image Credit: Osaka Metropolitan University

Scientific Frontline: Extended "At a Glance" Summary: Ytterbium Cesium Fulleride (\(\text{Yb}_2\text{CsC}_{60}\))

The Core Concept: Ytterbium cesium fulleride (\(\text{Yb}_2\text{CsC}_{60}\)) is a newly synthesized, all-carbon molecular system that continuously conducts electrons and maintains a robust metallic state, even when subjected to extreme cryogenic temperatures.

Key Distinction/Mechanism: While typical strongly correlated materials undergo a Mott metal-insulator transition—where interacting electrons become localized and turn the material into an insulator—\(\text{Yb}_2\text{CsC}_{60}\) possesses an unusual \(C_{60}\) valency of 5-. This near-filled electron band structure leaves a single "hole," allowing the quantum effect known as Hund's coupling to keep the electrons highly mobile within their p-orbitals. This mimics the electronic behavior typically restricted to transition metal d-orbitals.

Major Frameworks/Components:

• Mott Metal-Insulator Transition: A state change where conducting metals transform into insulators due to suppressed electron freedom, which is uniquely bypassed by this fulleride material.
• Hund's Coupling: A quantum mechanical effect governing how electrons populate orbitals and align their spins. Counterintuitively, this coupling preserves electron mobility in this specific single-hole state rather than trapping the electrons.
• p-Orbital vs. d-Orbital Parity: The discovery establishes an unexpected physical and electronic parallel between light-element molecular fullerides (p-orbitals) and well-documented transition metal systems (d-orbitals).

Quantum Friction: Light as a Nanoscale Brake

Martina Havenith-Newen, Sebastian Kruss, and Marialore Sulpizi (from left) work together in the RESOLV Cluster of Excellence.
Photo Credit: © RUB, Marquard

Scientific Frontline: Extended "At a Glance" Summary: Light-Induced Quantum Friction

The Core Concept: Light-induced quantum friction is an unexpected phenomenon in which irradiating nanoscale particles—specifically fluorescent carbon nanotubes in aqueous solutions—with visible light decelerates their movement rather than accelerating or heating them.

Key Distinction/Mechanism: Contrary to classical expectations where light imparts kinetic energy, this deceleration is caused by the direct coupling between excitons (mobile electronic excitations within the solid nanotube) and the fluctuating dipole moments of the surrounding water molecules. This dynamic creates a microscopic momentum transfer that acts as surface resistance, effectively braking the particle and decreasing its diffusion constant as light intensity increases.

Major Frameworks/Components:

• Fluorescent Carbon Nanotubes: Ultra-thin carbon meshes (100,000 times thinner than a human hair) serving as the solid nanoscale framework.
• Excitons: Electronic excitations whose mobility along the nanotube is responsible for the direct exchange with the fluid environment.
• Terahertz (THz) Spectroscopy: An advanced measurement technique utilized to observe real-time friction and energy dissipation after electronic excitation.
• Atomistic Simulations: Computational models used to numerically visualize the momentum transfer and collective molecular movements at the liquid-solid interface.

Metacrystals: A Low-Cost Solution for 6G

Image Credit: Aalto University

Scientific Frontline: Extended "At a Glance" Summary: Metacrystal Panels

The Core Concept: Metacrystal panels are affordable, 3D-printed, passive smart devices designed to guide wireless radio waves around physical barriers without requiring electronics, a power supply, or active tuning.

Key Distinction/Mechanism: Unlike conventional single-layer intelligent surfaces that manage only one signal direction and require complex control circuits, these volumetric metacrystals rely entirely on physical geometry. They can independently control multiple incoming signals and frequency bands simultaneously, operating in reflection, transmission, or complete signal absorption modes.

Major Frameworks/Components: 

• Volumetric Metacrystals: Three-dimensional physical architectures engineered to shape electromagnetic waves precisely.
• Passive Signal Routing: The redirection of high-frequency radio waves through spatial geometry rather than powered amplification.
• Multi-Signal Independence: The inherent capability to concurrently manipulate multiple wave trajectories and distinct frequency bands.
• Additive Manufacturing: Utilization of low-cost 3D-printed plastic structures, bringing material costs down to mere tens of euros per unit.

Atomic Roughness of Sapphire Surfaces

Jan Balajka, Andrea Conti, Ulrike Diebold, Johanna Irina Hütner, Michael Schmid, David Kugler (left to right)
Photo Credit: © Technische Universität Wien

Scientific Frontline: Extended "At a Glance" Summary: The Hidden Roughness of Sapphire Surfaces

The Core Concept: The atomic surface of aluminum oxide (sapphire) is not perfectly smooth and regular as theoretically predicted, but instead consists of a highly irregular, rough landscape that fundamentally alters its chemical reactivity.

Key Distinction/Mechanism: Long-standing theoretical models assumed a uniform basal plane of highly reactive aluminum atoms capable of easily splitting water molecules. However, high-resolution atomic imaging reveals that this regular geometry breaks down after just a few nanometers. This resulting atomic-scale disorder creates local height variations across multiple atomic layers, which dictates its chemical behavior and significantly lowers the surface's expected catalytic reactivity.

Major Frameworks/Components:

• \(\alpha\text{-Al}_2\text{O}_3\)(0001) Surface: The specific basal plane of aluminum oxide investigated in the study.
• Noncontact Atomic Force Microscopy (AFM): The high-precision physical imaging technique utilized to resolve the surface topography atom by atom.
• Density Functional Theory (DFT): The computational quantum mechanical modeling framework used in tandem with physical imaging to evaluate surface properties.
• Water Dissociation: The catalyzed chemical reaction—splitting water into hydrogen atoms and OH groups—which failed to occur at theoretically predicted rates due to the surface roughness.

Terahertz Imaging Maps Spatial Chirality

Concept and experimental demonstration of terahertz circular dichroism imaging. Circularly polarized terahertz radiation (left: blue, right: red) interacts with a moiré metasurface, producing distinct spectral responses and spatially resolved circular dichroism distributions (top). The chirality-dependent response reverses for mirror-imaged structures, demonstrating the ability to visualize the spatial distributions of chirality.
Image Credit: © Katsuhiko Miyamoto

Scientific Frontline: Extended "At a Glance" Summary: Visualizing Spatial Chirality with Terahertz Imaging

The Core Concept: A novel imaging technique utilizing spiral-shaped terahertz light to directly visualize and map the two-dimensional spatial distribution of right- and left-handed chirality across a material.

Key Distinction/Mechanism: Unlike conventional terahertz measurements that average chiral signals across an entire sample, this method employs circularly polarized terahertz radiation to generate spatially resolved circular dichroism distributions, achieving a precise resolution of approximately 100 μm.

Major Frameworks/Components:

• Terahertz (THz) Radiation: The use of circularly polarized waves situated between microwaves and infrared light to interact with subtle structural twists.
• Moiré-Type Metasurfaces: Microscopic silver disk patterns stacked with slight offsets or rotations to generate engineered artificial chiral structures.
• Circular Dichroism Spectroscopic Imaging: Measuring the differential absorption of right- and left-circularly polarized light to create a high-resolution chirality map.