Abstract: Micro/nano photonic structures and devices represent a frontier direction in contemporary photonics. Their core lies in the precise manipulation of optical fields across multiple dimensions—including amplitude, phase, polarization, and dispersion—using subwavelength artificial structures, providing essential physical foundations and device support for next-generation information processing, sensing, and quantum technologies. Against this backdrop, Opto-Electronic Engineering has organized a special issue on "Micro/nano photonics: structures and devices" in 2026, featuring 15 contributions including 5 review articles and 10 original research papers. This issue aims to systematically present recent advances in structural design, fabrication techniques, and functional devices in this field, offering valuable reference and inspiration for researchers in related disciplines.