Background
Optogenetics is a revolutionary technique that uses light to control the activity of specific neurons, with the potential to transform our understanding of brain function and the development of treatments for neurological disorders. However, conventional optogenetic tools have faced challenges in light delivery precision and scalability. To individually manipulate a large number of neurons with high spatial and temporal resolution, technologies that can efficiently guide light to microscopic regions are essential. Integrated photonic waveguides are attracting attention as an ideal solution to this challenge, as they can route light with much higher integration density than optical fibers. IMEC’s Neuropixels Opto probe represents state-of-the-art research in this field, offering new experimental tools to the neuroscience research community and expected to contribute to unraveling the brain’s complex networks.
Key Findings
Integrated photonic waveguide routing is emerging as a central technology in the design of next-generation optogenetic probes, enabling scalable and independently addressable light delivery. IMEC, a leading research institute in Belgium, is playing a pioneering role in this field, showcasing concrete implementations of this technology in its Neuropixels Opto probe.
Technical Details
The Neuropixels Opto probe developed by IMEC is an advanced neural interface designed to enhance the precision and complexity of optogenetic experiments. This probe incorporates an innovative optical waveguide routing structure that combines arrays of Mach-Zehnder interferometers (MZI) and multimode interferometers (MMI). This allows light signals from multiple sources to be precisely guided to minute regions, enabling independent stimulation of individual neuron groups or circuits. Furthermore, the integration of dual-color emitters permits simultaneous or selective delivery of light at different wavelengths, supporting complex protocols for multi-color stimulation and inhibition in optogenetic experiments. In terms of manufacturing, silicon nitride (SiN) is adopted as the base material, and 8-inch (200mm) semiconductor foundry technology is utilized to achieve high integration density and manufacturing scale. This also relates to similar research in programmable integrated quantum photonics, highlighting the importance of precise control of microscopic optical circuits.
Strategic Significance and Outlook
The evolution of integrated photonic waveguide routing technology has the potential to impact not only optogenetics but also a wide range of fields such as neural interfaces, biosensing, and even optical quantum computing. Moving forward, research institutions like IMEC will likely focus on improving the biocompatibility of probes, ensuring long-term stability, and further miniaturization and functional integration. If widely adopted, this technology could accelerate progress in brain science research and potentially pave the way for new light-based therapies for neurological diseases like Parkinson’s and epilepsy. Furthermore, 8-inch foundry manufacturing capability is a crucial factor for future mass production and cost reduction, enabling access for more researchers and clinical applications.
Source: https://www.oaepublish.com/articles/ss.2026.68
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