When a team of physicists in Paris fabricated the world’s first temporal photonic crystal, they added a new dimension to humanity’s quest to control light: time. From lighting our homes to advanced fiber optics and lasers, humans have long worked to control light, and now researchers say that can be achieved in a fourth dimension.

Yannis Laplace led the team at the Laboratory of Irradiated Solids (LSI) in demonstrating the temporal photonic crystal, with the help of other European institutions, which was revealed in a recent paper published in Nature.

As light hits the crystal, a terahertz electromagnetic wave rapidly modulates its optical properties, producing a device that controls light over time without expending energy.

Crystal Power

Controlling the properties of light for applications in telecommunications, sensors, and light sources is an active research field and is often reliant on crystals. In technical terms, a crystal is simply a regularly and periodically organized system. While we primarily think of translucent, shining crystals, they can be constructed of other forms of matter, such as gas or liquids, so long as their atoms arrange into regular, well-defined intervals.

How atoms arrange to form crystals grants their electrons and the photons they emit unique properties, including color and energy. Targeting photons specifically became an interest of scientists in the 1980s, with the development of photonic crystals, whose alternating materials each had unique effects on photons. These photonics gave rise to modern lasers, optical fibers, and photodetectors, technologies that have advanced considerably in recent decades.

Into the Time Dimension

In the last decade, researchers have experimented with a new kind of crystal: the time crystal. They are comprised of a unique form of matter in which particles repeat a continuous sequence—not just in the three physical dimensions, but also in time, without expending any energy.

The LSI team sought to combine photonic crystals with time crystals to develop a temporal photonic crystal that would control a light-matter interaction by alternating over time. Their work represents the first time such an idea has moved from the theoretical realm into the physical.

The device the researchers constructed operates in the high terahertz range, pushing light to oscillate 1000 billion times a second. It consists of micrometer-scale gold structures, shaped like battlements, leaving open cavities separated from an indium-antimony semiconductor by an insulating layer. The cavities between the gold structures trap light photons.

Testing a Temporal Photonic Crystal

To demonstrate their device in the real world, the LSI team bombarded it with terahertz laser pulses and recorded the material’s optical properties, modulating light over time. The effect was incredibly powerful, creating a strong modulation that alternated one billionth of a billionth of a second.

At the semiconductor layer, the researchers observed electrons forming from the light waves in what are called “surface plasmons,” oscillating with their effective mass. The greater their speed, the heavier these electrons become, producing the device’s optical modulations.

Beyond this observed phenomenon, the researchers suspect other interesting conditions may be occurring within the crystal. Some indirect evidence suggests that photons trapped inside the structure are amplified, although presently no direct observations have confirmed this. The team is continuing with experiments in hopes of eventually capturing this photon trapping phenomenon.

Laplace and his colleagues see these unique time crystals as eventually being a pathway toward the creation of terahertz-scale light sources and detectors, which would fit between those of electronics and visible light frequencies.

The paper, “Plasmonic Metamaterial Time Crystal,” appeared in Nature on July 29, 2026.

Ryan Whalen covers science and technology for The Debrief. He holds an MA in History and a Master of Library and Information Science with a certificate in Data Science. He can be contacted at ryan@thedebrief.org.

In a remarkable advancement that promises to redefine materials science, researchers have developed an extraordinary crystal exhibiting isotropic zero thermal expansion (ZTE) across an unprecedentedly wide temperature range. This pioneering work focuses on a sodalite-structured compound, Cd4Al6O12SO4, abbreviated as CASO, which maintains near-perfect dimensional stability from cryogenic temperatures as low as 11 K up to an exceptional 893 K. Such a feat addresses one of the most persistent challenges in materials engineering—achieving consistent, isotropic ZTE behavior over a broad thermal window, well beyond the typical operating limit of 400 K commonly found in existing materials.

Thermal expansion, the tendency of materials to expand or contract in response to temperature changes, significantly influences the reliability and precision of components in advanced technological systems. This is particularly critical in optics, aerospace, and microelectronics, where slight dimensional deviations can lead to catastrophic failures or degraded performance. Traditionally, materials exhibiting zero or near-zero thermal expansion either operate within narrow temperature bands or display anisotropic expansion, complicating their practical application. CASO emerges as a groundbreaking solution by combining flexibility and robustness within a closed-framework sodalite structure, a geometry celebrated for its remarkable stability.

What sets CASO apart is the ingenious incorporation of flexible interstitial groups realized via fractionally occupied atoms nestled within the sodalite framework. This strategic design introduces subtle positional disorder among ligand atoms, a feature that amplifies transverse atomic vibrations responsible for generating negative thermal expansion. These enhanced transverse vibrations effectively counterbalance the intrinsic positive thermal expansion that arises from atomic lattice expansion at elevated temperatures. As a result, CASO achieves a finely tuned, cancellatory interplay between positive and negative thermal expansion mechanisms, yielding an overall coefficient of thermal expansion measured at a negligible 0.21(23) × 10^−6 K^−1.

The research team’s exploration of CASO’s structural integrity under rigorous thermal cycling reveals impressive resilience, with the material maintaining its crystalline structure up to 1,100 K. This high thermal threshold expands the operational capacity of ZTE materials into regimes previously inaccessible, paving the way for applications in extreme thermal environments such as space exploration technologies and high-temperature sensor systems. Importantly, the integrity of CASO at such elevated temperatures also suggests potential advancements in engineering components that must endure thermal shocks without suffering deformation or failure.

Beyond mechanical stability, CASO exhibits a solar-blind ultraviolet (UV) transparency window extending down to 275 nm. This optical property signifies that the material can transmit UV light within this range without absorption, rendering it valuable for specialized UV optics and photonics applications. Devices requiring minimal optical noise and high stability, such as spaceborne UV detectors and precision laser optics, stand to benefit from CASO’s unique optical-transparency combined with its unparalleled thermal stability.

Optical materials are notoriously susceptible to thermal fluctuations, which induce refractive index changes and distort beam paths, complicating precision measurements and laser operations. CASO’s thermally induced optical fluctuations are at least twice as low as those found in conventional optical media, an achievement that underscores its potential to revolutionize precision optics. This property not only enhances the performance of existing systems but also reduces the need for complex compensatory mechanisms, simplifying designs and improving reliability in challenging thermal environments.

Substantially, CASO’s isotropic ZTE capacity challenges and expands the conventional understanding of thermomechanical behavior in framework materials. The sodalite structure itself provides a three-dimensional network that constrains thermal responses isotropically, a feature critical for applications demanding uniform response in all spatial directions. The partial occupation and flexibility of interstitial species suggest new dimensions of control over lattice dynamics and open pathways for tailored ZTE behavior through chemical modification and structural engineering.

The discovery underscores the significance of lattice dynamics modulation via controlled disorder—a concept that holds promise far beyond ZTE materials. Manipulating atomic vibrational modes through fractional occupancy and positional disorder reshapes how scientists can exploit negative thermal expansion while mitigating positive expansion, with implications for diverse fields from thermal barrier coatings to quantum materials.

Moreover, the work by Liu, Jiang, Molokeev, and colleagues establishes a universal strategy for engineering ZTE materials, thus serving as a blueprint for future crystal design. Rather than relying on complex composites or layered heterostructures, this approach leverages the intrinsic vibrational characteristics and flexibility within single-phase crystals. Such simplicity in design may accelerate industrial adoption and reduce costs associated with fabricating advanced thermal-stable materials.

The implications of this discovery are profound for the electronics and precision engineering industries. Components fabricated from CASO could maintain micron-scale tolerances across vast thermal gradients, thereby improving the longevity and performance of microelectromechanical systems (MEMS), precision optics, and high-frequency electronic devices. The broad temperature stability and isotropy also alleviate challenges associated with thermal mismatch and interface stresses in multilayered devices.

In addition to immediate technological applications, CASO’s unique properties may spur new scientific inquiries into the fundamental physics of thermal expansion. Investigating how flexible ligand atoms interact within complex frameworks provides insights into phonon dynamics, anharmonic lattice vibrations, and thermodynamic stability. This research advances theoretical models and computational simulations aiming to predict and control thermal properties at the atomic scale.

As society increasingly demands materials that withstand extreme environmental conditions without compromising structural or optical performance, CASO stands as a beacon of hope and innovation. Its extended temperature operational window combines mechanical robustness, optical transparency, and thermal stability into a single crystalline phase—attributes that are rarely coexistent. This convergence could lead to breakthroughs in harsh-environment sensors, satellite optics, and next-generation aerospace components.

Furthermore, the concept of embedding fractionally occupied flexible groups within stable frameworks could be extrapolated to customize other physical properties such as thermal conductivity, dielectric constants, and even magneto-thermal behavior. This multifunctionality potential situates CASO not just as a material of the present, but as a foundation for multifunctional crystals engineered at the atomic level for bespoke applications.

In conclusion, CASO embodies a paradigm shift in thermal expansion control, marrying structural ingenuity with atomic-scale dynamism. Its validation as an isotropic zero thermal expansion material from cryogenic to near-1100 K temperatures resolves a longstanding challenge and invites a new era of functional materials science. This elegant interplay of lattice architecture and vibrational physics heralds a future where materials no longer passively endure thermal fluctuations but actively neutralize them, ushering in unprecedented precision and resilience in advanced technologies.

Such groundbreaking discoveries, as reported by Liu and colleagues in Nature Chemistry, showcase the transformative power of crystal engineering and vibrational control. The research propels us beyond incremental advances to a realm where materials can be custom-tuned for the harshest and most demanding environments known to science and industry, reshaping what is possible across technological frontiers.

Subject of Research: Isotropic zero thermal expansion properties in a sodalite-structured crystal (Cd4Al6O12SO4, CASO) across an exceptional temperature range.

Article Title: Isotropic zero thermal expansion in sodalite crystals from 11 to 893 K.

Article References:
Liu, Y., Jiang, X., Molokeev, M.S. et al. Isotropic zero thermal expansion in sodalite crystals from 11 to 893 K. Nat. Chem. (2026). https://doi.org/10.1038/s41557-026-02174-x

Image Credits: AI Generated

DOI: https://doi.org/10.1038/s41557-026-02174-x