From Invisible Waves to a Greener Environment: Dr SaeJune Park’s Research on Unlocking the Terahertz Spectrum
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A close-up look at our ultra-sensitive on-chip THz sensor designed to interact with a single microscopic particle.
Have you ever wondered what lies between the infrared light of your TV remote and the microwaves that heat your food? This hidden region of the electromagnetic spectrum is known as the terahertz (THz) gap. For a long time, it remained underutilised because the technology to generate and detect these waves was incredibly difficult to build. At the Centre for Electronics, School of Electronic Engineering and Computer Science, QMUL, my research focuses on unlocking this spectrum to solve pressing global environmental challenges.
At the heart of our work are THz waves and advanced 3D metamaterials, man-made structures engineered to manipulate electromagnetic waves in ways nature cannot. Because THz waves are highly sensitive to molecular vibrations but completely non-ionising (meaning they are entirely safe, unlike X-rays), they offer an unprecedented window into the material world.
One of our key research areas is environmental sustainability. We are currently developing ultra-sensitive on-chip THz spectroscopy platforms designed to detect microplastics in our water systems. Because microplastics are incredibly small and diverse, traditional optical methods often fail to identify them accurately. Our THz sensors can fingerprint these tiny pollutants, providing a vital tool for real-time environmental monitoring.
Furthermore, we are exploring the frontiers of 3D-printed electronics by investigating the dielectric properties of 3D printing materials. By understanding how these materials and devices interact with high-frequency waves, we can pave the way for next-generation, affordable components in wireless communications.
Ultimately, my research aims to bridge the gap between complex electronic engineering and real-world impact. Whether it is ensuring a cleaner environment or enabling smarter, eco-friendly technologies, the THz spectrum holds the key to a safer and more sustainable digital world.