Micro-trenches, tiny grooves etched into materials, play a critical role in various high-tech applications. Their precise three-dimensional morphology dictates key properties such as electronic performance, mechanical strength, and fluid dynamics on microscale devices. Yet, traditional imaging methods have struggled to achieve comprehensive, high-resolution measurements of structures with high aspect ratios—those with depths significantly larger than their width—due to limitations in focus depth and resolution.

The newly developed FPCSI technique addresses these challenges by combining the power of Fourier ptychography with coherence scanning interferometry. Fourier ptychography itself is a computational imaging method that synergistically uses multiple low-resolution images captured under varying illumination angles to synthesize high-resolution images free of the limitations imposed by conventional optics. Meanwhile, coherence scanning interferometry is a well-established optical technique for measuring surface topography with nanometric precision.

By fusing these two approaches, the research team has effectively created a hybrid system capable of resolving complex micro-trench geometries with unprecedented clarity. The method exploits the coherent nature of light and computational reconstruction algorithms to extract phase information, which, when analyzed across different focal positions, renders a high-fidelity 3D image. This allows for the meticulous profiling of microstructures, including deep trenches and composite formations that were previously inaccessible.

In demonstrating the efficacy of FPCSI, the researchers meticulously investigated micro-trenches with aspect ratios far exceeding those measurable by existing solutions. Their approach yielded precise depth maps and surface profiles, revealing subtle features within the trenches that conventional microscopy would miss. This opens doors to better quality control and design optimization in semiconductor fabrication, where such trench structures are ubiquitous.

Furthermore, the technique’s non-destructive nature stands out as particularly advantageous. Unlike methods requiring physical sectioning or those employing harsh probing tools, FPCSI operates purely through optical means, preserving the integrity of delicate samples. This characteristic is crucial in research and industry where every sample holds significant value and must remain unaltered for subsequent analysis or functional use.

The ability to characterize composite micro-trenches—those composed of multiple materials or layers—adds another dimension to the method’s versatility. Different materials often exhibit unique refractive indices and scattering properties, complicating optical measurements. FPCSI leverages its coherent scanning framework to differentiate between these layers, providing a detailed morphological map that elucidates structural composition as well as geometry.

Technically, the process involves scanning a sample through multiple focus positions while illuminating it under varying incident angles. The resulting dataset, rich in both amplitude and phase information, is then processed through iterative algorithms rooted in Fourier ptychography principles. These algorithms reconstruct high-resolution images and precise depth profiles from what would otherwise be fragmented or blurred data, overcoming classical optical trade-offs between resolution and depth of field.

The impact of this innovation stretches beyond just micro-trenches. The researchers envision applications in microfluidics, biomedical devices, and nanofabrication, where accurate morphological characterization is essential. For instance, in microfluidics, the precise dimensions of channels and reservoirs influence fluid flow dynamics and reaction rates; FPCSI could provide a powerful tool for designing and validating such devices with greater efficiency.

Another promising avenue lies in the realm of materials science, particularly in the inspection of composite materials and layered structures. FPCSI’s sensitivity to phase variations makes it an excellent candidate for evaluating internal morphologies and detecting sub-surface defects that traditional imaging struggles to resolve.

While the technique is computationally intensive, advances in processing power and algorithm optimization have made it increasingly accessible. The researchers have implemented efficient codebases and integrated machine learning strategies to accelerate image reconstruction, envisioning real-time or near-real-time imaging capabilities in future iterations.

Despite the successes, the team acknowledges certain limitations. The requirement for controlled illumination angles and precise scanning mechanisms can pose experimental challenges. Furthermore, complex surface reflections and multiple scattering in highly irregular structures might still introduce artifacts. However, ongoing refinements in hardware and software are expected to mitigate these issues.

The paper detailing the development and validation of FPCSI represents a significant contribution to optical microscopy and metrology. By cleverly integrating established methods into a cohesive and powerful imaging tool, the researchers have carved out a new pathway for detailed, non-invasive exploration of microscale features that were, until now, elusive.

Ultimately, the innovation not only fills a technical gap but also paves the way for enhanced quality assurance, novel device design, and deeper scientific understanding across multiple disciplines. As the digital and physical worlds continue to converge at micro- and nano-scales, tools like Fourier ptychographic coherence scanning interferometry will become instrumental in shaping the next wave of technological advancement.

The versatility and precision of FPCSI underscore the increasing importance of interdisciplinary approaches, combining optics, computational imaging, and materials science. This convergence reflects a broader trend toward harnessing light’s coherent properties alongside algorithmic ingenuity, positioning this technique at the forefront of imaging science innovation.

In an era where micro- and nano-fabrication is integral to numerous industries, the ability to fully characterize complex internal structures without destruction or compromise is invaluable. FPCSI fulfills this need with elegance and efficiency, promising to become a standard in advanced optical metrology.

Continued research and development will likely enhance the technique’s robustness, reduce its dependence on idealized sample preparation, and expand its applicability to a wider array of materials and geometries. The vision of capturing intricate 3D micro-morphologies in real time is now closer than ever, thanks to this breakthrough.

By unlocking new dimensions of imaging capacity, Fourier ptychographic coherence scanning interferometry stands to accelerate innovation in microelectronics, photonics, and beyond, echoing the ever-growing demand for precision and detail at the smallest scales of technology and nature.

Subject of Research:
Three-dimensional morphological characterization of high aspect ratio and composite micro-trenches.

Article Title:
Fourier ptychographic coherence scanning interferometry for 3D morphology of high aspect ratio and composite micro-trenches.

Article References:
Li, Y., Yuan, Q., Huo, X. et al. Fourier ptychographic coherence scanning interferometry for 3D morphology of high aspect ratio and composite micro-trenches. Light Sci Appl 15, 93 (2026). https://doi.org/10.1038/s41377-026-02189-6

Image Credits: AI Generated

DOI: 29 January 2026

At the heart of this discovery lies the challenge of continuously shrinking the features etched onto silicon wafers, the foundational substrates for modern microchips. Traditional photolithography—the primary method of imprinting electrical circuits onto these wafers—reaches physical and material limits as engineers strive for features smaller than 10 nanometers. The problem is compounded by the inadequacy of standard resists, the radiation-sensitive coatings used to expose circuit patterns, which do not absorb higher energy radiation efficiently. To address this, the Johns Hopkins team has introduced a groundbreaking approach leveraging “beyond extreme ultraviolet radiation” or B-EUV, a sophisticated radiation source with shorter wavelengths capable of defining finer details.

The crux of their innovation stems from engineering novel metal-organic resists that absorb this high-energy radiation effectively, enabling ultra-fine patterning below the current technological limits. By incorporating metals such as zinc, the researchers created materials that strongly interact with B-EUV light, triggering electron emissions that initiate chemical transformations within an organic framework. This process etches intricate circuitry into the resist with unprecedented resolution, opening pathways to next-generation microchip manufacturing. The organic component they utilized is based on imidazole, a versatile molecule capable of forming robust bonds with metal atoms, thus creating stable but reactive coatings ideal for lithography protocols.

A significant hurdle overcome by the team was developing a method to reliably deposit these metal-organic resists at the wafer scale, maintaining nanometer-level control over the thickness. They pioneered a chemical liquid deposition (CLD) technique that allows these materials to be spin-coated in precisely calibrated layers. This solution-based deposition method is advantageous for scalability and consistency, vital factors for integration into existing semiconductor fabrication lines. Using a synergy of experimental investigations and computational modeling, the multidisciplinary team encompassing Johns Hopkins University, East China University of Science and Technology, and other leading labs, refined the chemistry and process parameters to optimize resist performance on standard 10 cm silicon wafers.

This breakthrough not only advances materials science but also revolutionizes lithography engineering by unlocking a spectrum of new metal-organic pairings. The team demonstrated that by manipulating both the metallic element and the organic ligand, they could fine-tune the absorbance efficiency and subsequent chemical reactivity post-irradiation. This versatility is crucial because different metal atoms respond distinctly to various radiation wavelengths, allowing tailored solutions for specific lithography applications. For instance, zinc emerged as a particularly effective metal for B-EUV, despite its relatively poor performance under traditional EUV radiation, highlighting the nuanced interplay between material composition and photonic excitation.

The implications of this discovery extend far beyond laboratory settings. As semiconductor manufacturers race to meet Moore’s Law’s demands, the ability to incorporate B-EUV lithography with these novel resists promises to significantly reduce feature sizes and enhance chip densities. The researchers anticipate that production lines utilizing this technology could enter commercial use within the next decade, spearheading a new era of microelectronics characterized by unparalleled device miniaturization and energy efficiency. This aligns seamlessly with the strategic roadmaps companies have set for their product development timelines, targeting breakthroughs in 10 to 20-year horizons.

Fundamental to this research was the collaboration across international scientific communities and national laboratories, combining expertise and state-of-the-art facilities. Institutions such as Brookhaven National Laboratory and Lawrence Berkeley National Laboratory contributed instrumental resources and knowledge, facilitating advanced characterization techniques essential for validating the resist materials’ properties. Likewise, partners like École Polytechnique Fédérale de Lausanne and Soochow University played pivotal roles in theoretical modeling and experimental verification, respectively, underscoring the collaborative nature of this cutting-edge research.

The team’s publication, appearing in the prestigious journal Nature Chemical Engineering, details the spin-on deposition approach of amorphous zeolitic imidazolate framework films for lithography applications. This work elucidates the fundamental chemistry enabling the formation of homogeneous, ultra-thin films that serve as precise masks during radiation exposure. By controlling the film formation down to nanometer-level variations, the technique ensures reproducible patterning critical for semiconductor fabrication standards, paving the way for widescale adoption in industrial processes.

The novel resist materials offer more than just patterning precision; they boast increased chemical robustness and environmental stability compared to traditional photoresists. This resilience is paramount as manufacturers integrate higher intensity radiation sources, which can degrade or damage conventional resists, leading to defects and yield loss. In contrast, the metal-organic frameworks developed provide stability under extreme processing conditions, minimizing degradation and enhancing throughput – a vital economic factor.

Moreover, the adaptability of this chemistry is noteworthy. With a palette of over ten metals and hundreds of potential organic ligands, the research opens an expansive design space enabling lithographers to customize resist properties for specific wavelengths and manufacturing needs. This modular approach empowers semiconductor fabrication engineers to fine-tune absorption characteristics and chemical response profiles tailored to emerging lithography technologies beyond B-EUV, future-proofing the industry against rapid evolution in photonic sources and fabrication demands.

As the semiconductor industry faces mounting pressure to reduce costs while pushing the limits of miniaturization, this research arrives as a potential game-changer. The use of solution-processed metal-organic resists combined with advanced deposition techniques promises to streamline production and enhance feature resolution simultaneously. The approach not only promises to drive innovation in consumer electronics with faster, more energy-efficient chips but also holds promise for broader technological domains including artificial intelligence hardware, quantum computing elements, and next-generation sensors in aerospace and automotive systems.

In sum, Johns Hopkins researchers have unveiled a multidisciplinary, collaborative solution that marries cutting-edge materials science with revolutionary lithography methods. Their work charts a new course for semiconductor manufacturing, offering a tangible pathway to surpass existing technological limits with an economically viable process. As the world increasingly demands smarter, smaller, and faster devices, this innovation stands poised to catalyze the next major leap in microelectronics, fundamentally altering how circuits are built and enabling unprecedented capabilities across multiple industries.

Subject of Research: Development of novel metal-organic resists for B-EUV lithography enabling sub-10 nanometer microchip features.

Article Title: Spin-on deposition of amorphous zeolitic imidazolate framework films for lithography applications

News Publication Date: 11-Sep-2025

Web References: https://www.nature.com/articles/s44286-025-00273-z

Image Credits: Xinpei Zhou, Johns Hopkins University

Keywords: Semiconductors, Microelectronics, Manufacturing, Electrical engineering, Chemical engineering

The study highlights that energy storage materials are pivotal in the transition to renewable energy sources and improving the efficiency of electronic devices. With the global shift towards sustainable energy solutions coupled with the advancement of technologies in electronics and electric vehicles, the demand for efficient energy storage systems has surged. Researchers have thus directed their endeavors towards identifying and optimizing materials that can meet these rigorous demands, and polyetherimide stands out due to its commercial viability and inherent properties.

Rapid thermal annealing is a process involving the quick heating and subsequent cooling of materials to enhance their characteristics. This technique has long been utilized in semiconductor manufacturing but is now being repurposed for material sciences, particularly for polymers like PEI. By inducing rapid thermal cycles, the molecular structure of PEI can be altered, resulting in changes to its physical and electrical properties. The significance of this method lies in its ability to fine-tune the polymer’s structure without degrading its core attributes.

In their research, Ou et al. demonstrated that applying rapid thermal annealing to pure polyetherimide films markedly improved their energy storage capabilities. The team meticulously crafted samples of PEI and subjected them to a series of rapid thermal annealing processes, monitoring the ensuing effects on their structural and electrical properties. The results were striking; not only did the energy density improve significantly, but the dielectric properties also exhibited noticeable enhancements, suggesting a strong correlation between thermal treatment and material performance.

One of the remarkable findings was the increase in the dielectric constant of the annealed PEI films. A higher dielectric constant translates to more effective energy storage, which is crucial for applications in capacitors and high-performance batteries. The study reports that the dielectric breakdown strength of these films remained intact, ensuring that the enhanced properties did not compromise the material’s stability. This balance is vital for practical applications where energy density must be maximized without risking failure during operation.

Further investigation into the microstructural changes revealed that rapid thermal annealing induced an arrangement of molecular chains within the polymer that facilitated improved dipole alignment. This structural refinement likely contributes to the enhanced dielectric behavior observed in the processed films. Understanding these molecular behaviors is essential as it paves the way for future innovations in polymers designed for energy applications.

In their conclusion, the authors stress the implications of their findings on both the material science community and industry applications. The ability to utilize rapid thermal annealing not only positions polyetherimide films as formidable contenders in energy storage technologies but also shows promise for scalability in production. Integrating such advanced materials into existing manufacturing processes can bridge the gap between theoretical research and practical deployment.

The versatility of polyetherimide, combined with the strategic application of rapid thermal annealing, opens up a myriad of potential applications. From lightweight, high-efficiency capacitors to components in electric vehicles, the implications reach far into the future of energy solutions. As industries work towards meeting the increasing global energy demands sustainably, innovations like those presented by Ou et al. could lead to groundbreaking improvements in how energy is stored and managed.

Moreover, the ongoing exploration into polymer-based energy storage solutions continues to highlight the important role of material engineering in scientific advancement. As researchers seek to refine these materials further, it is essential to highlight collaborations across disciplines — from chemistry and material science to engineering and manufacturing — to spearhead this evolution in energy technology.

This study not only demonstrates the promising capabilities of pure polyetherimide films but also calls for further research to explore the limits of rapid thermal annealing and its effects on various polymer matrices. Future work could investigate the interactions of different additives or coatings during the annealing process, potentially unlocking even greater enhancements in energy storage properties.

As the landscape of energy storage continues to evolve, the methodologies employed to refine materials will undoubtedly play a pivotal role in determining the success of new technologies. As highlighted in Ou et al.’s research, the combination of innovative techniques and proven materials may very well be the key to ushering in the next generation of energy storage solutions that the world so desperately needs.

This scientific exploration not only advocates for a renewed focus on existing materials but serves as a reminder that the potential for breakthroughs in energy storage lies in both innovation and refinement. As more researchers delve into the intersections of polymers and advanced processing techniques, the future of energy storage promises to be as dynamic as the materials themselves.

Subject of Research: Enhanced energy storage properties of pure polyetherimide films via rapid thermal annealing.

Article Title: Enhanced energy storage properties of pure polyetherimide films via rapid thermal annealing.

Article References: Ou, J., Chen, H., He, G. et al. Enhanced energy storage properties of pure polyetherimide films via rapid thermal annealing. Ionics (2025). https://doi.org/10.1007/s11581-025-06653-y

Image Credits: AI Generated

DOI: https://doi.org/10.1007/s11581-025-06653-y

Keywords: polyetherimide, rapid thermal annealing, energy storage, dielectric properties, thermoplastic, high-performance materials.