Optoelectronic tweezers and digital microfluidics for biomicromanipulation

The convergence of photonics and microfluidics offers powerful tools for biological research. However, a gap remains between technologies that offer high-precision, light-based manipulation of single cells and those that provide high-throughput automation of liquid microenvironments. This paper details a hybrid platform that bridges this gap by integrating optoelectronic tweezers and digital microfluidics. Optoelectronic tweezers utilize projected light patterns to generate dynamic dielectrophoretic forces, enabling non-invasive manipulation of biological particles with high spatiotemporal resolution and sub-cellular precision. Digital microfluidics complements this by using electrowetting to precisely control entire droplet-based microenvironments. Our integrated approach synergistically combines these capabilities on a single chip, allowing for intricate, light-guided cellular operations to be performed within individually addressable droplets. We discuss the design of both modular and monolithic integrated architectures, highlighting how this fusion creates a powerful lab-on-a-chip system. This biophotonic innovation enables complex, automated workflows, from single-cell sorting to biochemical analysis, with significant implications for diagnostics and fundamental cell science.