Emerging Trends in Optical Metasurfaces: feature issue introduction

We introduce the feature issue of Optical Materials Express on Emerging Trends in Optical Metasurfaces . This collection showcases cutting-edge research in the design, functionality, and application of metasurfaces—artificially engineered planar structures capable of precise control over electromagnetic waves. The featured contributions span a wide spectrum, from active reconfiguration and multifunctional operation to advanced sensing, flexible waveguiding, aberration-corrected beam control, and intelligent inverse design, highlighting the dynamic evolution and expanding frontiers of this field.