Breakthrough in Deep Ultraviolet Nanophotonics
Singapore's research landscape is witnessing a transformative advancement with the unveiling of a novel hybrid nanophotonic platform designed to manipulate deep ultraviolet light in semiconductor materials. Developed by scientists at the Agency for Science, Technology and Research (A*STAR), this innovation addresses longstanding challenges in controlling light at wavelengths below 280 nanometers, paving the way for next-generation ultraviolet photonic devices. The platform, highlighted in the aptly titled study "It Takes Two To Resonate," leverages the synergy between silicon nanostructures and dielectric layers to achieve unprecedented resonance quality, marking a significant step forward for compact, efficient optical technologies.
This development is particularly timely as Singapore positions itself as a global hub for semiconductor and photonics research. With substantial investments like the S$37 billion Research, Innovation and Enterprise 2030 (RIE2030) plan, initiatives such as this underscore the nation's commitment to high-impact technologies that drive economic growth and address global challenges like advanced manufacturing and health security.
🛠️ The Challenges of Deep Ultraviolet Light Manipulation
Deep ultraviolet (deep UV or DUV) light, spanning wavelengths from 200 to 280 nanometers, possesses unique properties that make it invaluable for applications ranging from microbial disinfection and water purification to high-resolution lithography in semiconductor fabrication. Unlike visible or near-UV light, DUV interacts strongly with matter, enabling precise material processing but posing significant engineering hurdles.
Traditional DUV sources, such as mercury lamps or excimer lasers, are bulky, energy-intensive, and environmentally hazardous due to toxic materials. Efforts to miniaturize these using semiconductors have been stymied by issues like light leakage, broad resonances, and high energy losses. Interband plasmons (IBPs) in materials like crystalline silicon (c-Si) offer promise by exploiting electronic transitions to create negative permittivity in the DUV spectrum. However, their inherently broad resonances limit practical utility, resulting in poor light confinement and low quality factors (Q-factors), which measure how long light can be trapped in a resonator.
In Singapore, where semiconductors contribute over 5% to GDP and the nation hosts major players like GlobalFoundries, overcoming these barriers is crucial for sustaining leadership in chip design and fabrication.
The Hybrid Platform: Engineering Resonance at the Nanoscale
At the heart of this breakthrough is a hybrid nanophotonic platform that combines localized plasmon resonance from silicon nanostructures—such as nanodisk or nanohole arrays—with Fabry-Pérot cavity resonance from a thin silicon dioxide (SiO₂) dielectric layer atop a silicon substrate. This 'two-to-tango' design, where the plasmonic antenna traps and concentrates light while the cavity reflects it back and forth like an echo, hybridizes the modes when precisely tuned.
The process unfolds step-by-step: First, silicon nanostructures are fabricated on the SiO₂ layer using advanced nanofabrication techniques available at A*STAR's Institute of Materials Research and Engineering (IMRE). The cavity thickness and nanostructure dimensions are optimized so both modes resonate at the same energy, around 4.6 electronvolts (approximately 270 nm in DUV). This synchronization yields a simulated Q-factor of 43 and an experimental value of 37—a more than 10-fold improvement over standalone interband plasmonic structures.
Experimental validation involved reflectance spectroscopy and angle-resolved measurements, confirming sharp, tunable resonances even with polarization-dependent elliptical nanodisks. In a practical demonstration, the platform boosted DUV absorption in lignin-modified polyethylene glycol films by 5.4 times, showcasing potential for UV-blocking coatings in consumer products.
Key Researchers Driving Innovation
Leading the effort is Zhaogang Dong, Principal Scientist at A*STAR's IMRE and Quantum Innovation Centre (Q.InC), and Associate Professor in the Science, Mathematics, and Technology Cluster at the Singapore University of Technology and Design (SUTD). With over 100 publications in top journals like Nature Photonics and ACS Nano, plus four patents in nanophotonics, Dong's expertise in sub-10-nm fabrication and optoelectronic meta-devices is pivotal.
Yan Liu, Senior Scientist at A*STAR Q.InC, contributed key insights into electrically driven plasmonic devices and tunable quantum metasurfaces. The team also includes contributors from A*STAR's Institute of Sustainability for Chemicals, Energy and Environment (ISCE²), SUTD's Joel K. W. Yang, and National University of Singapore (NUS) researchers Xiao Chi and Andrivo Rusydi from the Singapore Synchrotron Light Source and Physics Department. International collaboration with the University of Sheffield's Graham Leggett and Evelin Csányi adds global depth.
"We want to control DUV light at the nanoscale using materials already present in today’s computer chips," Dong explained. "This could open the possibility of making optical devices that are smaller, more cost-effective, and easier to integrate." Liu added, "This opens a new semiconductor-based route for ultraviolet nanophotonics."
Synergies Between A*STAR and Singapore's Universities
This research exemplifies the vibrant ecosystem linking A*STAR with Singapore's top universities. SUTD's involvement through Dong's dual role and faculty like Joel Yang highlights hands-on, design-thinking approaches to photonics. NUS contributions via synchrotron facilities enable precise material characterization essential for nanoscale validation.
Such partnerships are bolstered by national initiatives. RIE2030 allocates S$800 million to semiconductors, including photonics, fostering joint labs and talent pipelines. NUS and NTU share high-value facilities like the Invizo 6000 3D Atom Probe, while SUTD collaborates on 6G and MediaTek labs (S$34 million investment). These ties translate research into prototypes, with A*STAR's S$1.1 billion industry R&D attraction amplifying impacts.
For students, this means access to cutting-edge projects; many co-authors are likely from university labs, training the next generation in nanofabrication and plasmonics.
Transformative Applications Across Industries
The platform's high-Q resonances enable silicon-based DUV photodetectors with superior sensitivity, ideal for flame detection, chemical sensing, and counterfeit verification. In disinfection, compact DUV sources could revolutionize air and water purification—critical for Singapore's NEWater program and post-pandemic hygiene.
For lithography, enhanced light control supports finer chip patterns, aligning with Singapore's semiconductor push (20% global advanced packaging). UV-blocking enhancements, as shown with lignin-PEG, promise sustainable coatings for packaging and textiles. Learn more about the underlying study in the Nano Letters publication.
- Disinfection: Efficient microbe inactivation without chemicals.
- Lithography: Higher resolution for next-gen chips.
- Sensors: Ultrasensitive detection in harsh environments.
- Energy: Potential in UV solar-blind detectors.
Singapore's Semiconductor Boom: Economic and Research Impacts
Semiconductors underpin 9% of Singapore's GDP, with photonics as a growth engine. Government funding—S$37 billion RIE2030, S$500 million national facilities—has spurred facilities like A*STAR's 200mm SiC line and piezoMEMS platforms. Impacts include 1,000+ high-tech jobs created yearly, with photonics salaries averaging S$5,000-S$7,000 monthly for fresh grads (GES 2025 data).
Universities benefit: NUS/NTU median grad salaries S$4,200-S$6,500; SUTD at S$4,900. Research output: Singapore's Field Weighted Citation Impact rose to 1.76 (2024), with photonics papers surging. Collaborations like Applied Materials-NUS labs deepen talent pipelines. Visit the A*STAR highlight article for visuals and quotes.
Career Pathways in Photonics and Semiconductors
For aspiring researchers, Singapore offers abundant opportunities. A*STAR posts Research Engineer roles in photonics (S$4,500+), while NUS/NTU/SUTD hire postdocs (S$6,000-S$8,000). With 70+ photonics jobs listed (Jobstreet 2026), demand spans fabrication, design, and applications.
- Entry-level: Research assistants at unis (S$3,500 median).
- Mid-career: Scientists at A*STAR (S$7,000+).
- Academic: Lecturers at SUTD/NUS (S$10,000+).
Programs like new scholarships for quantum/semiconductors ensure skilled workforce.
Photo by Lily Banse on Unsplash
Future Horizons for Deep UV Technologies
Looking ahead, the platform could integrate into silicon chips for multifunctional devices, supporting Singapore's photonics committee goals. Ongoing A*STAR-university projects target commercialization, with prototypes for DUV detectors imminent. As global DUV market grows (projected USD 400M by 2028 in Asia-Pacific), Singapore's edge sharpens.
This resonance duo not only illuminates technical paths but inspires cross-disciplinary innovation, blending materials science, physics, and engineering at Singapore's universities.
