An optical frequency comb is a wideband light source consisting of stable frequency and evenly spaced comb teeth, manifesting as periodic ultrashort pulse outputs in the time domain. The inverse of pulsation period corresponds to the frequency spacing of the comb teeth in the frequency domain, known as the repetition rate. Over the past two decades, optical frequency combs have found wide applications in fields such as precision measurement and advanced manufacturing. Against the backdrop of pursuing faster measurement speeds and higher processing quality, optical frequency combs with high repetition rates have gradually attracted attention. Thanks to the excellent device integration and scene compatibility, optical frequency comb sources based on fiber schemes have developed rapidly in recent years. This review focuses on high-repetition-rate fiber-based optical frequency comb technology. We first briefly introduce the basic concepts and principles of fiber-based optical frequency combs, then review the diverse technical approaches for directly generating high-repetition-rate optical frequency combs in fiber schemes, analyzing their development history, current research status, and the challenges. Finally, based on the technical performance indicators of existing high-repetition-rate fiber-based optical frequency combs, we offer in-depth outlook of their future prospects in application fields.

The photothermal effect induced by surface plasmon resonance has attracted significant attention in the field of nanostructure regulation due to its advantages, including excellent light absorption and thermal conversion capability, localized heating characteristics, rapid response speed, and relatively controllable thermal distribution. This review systematically summarizes the generation mechanisms, regulatory strategies, and applications of plasmonic thermal effects in micro/nano material structural control. Firstly, the influence of noble metal energy band structures on material optical properties is explored, with mechanistic analysis of interband transitions and intraband transitions in governing plasmon relaxation dynamics and hot carrier generation processes. Subsequently, the physical origins of plasmonic thermal effects and their regulatory measures are discussed. The latest advancements in applying plasmonic heating to modulate the structures of metallic and dielectric nanomaterials are consolidated, including applications in nanomaterial growth, morphological deformation, and crystal phase transformations. A particular focus on the structural regulation and luminescence property tuning of rare-earth-doped micro/nanocrystals enabled by plasmonic thermal effect. Finally, this review summarizes current research progress, identifies remaining challenges, and outlines potential future research directions and applications, with particular attention to potential contributions in fields such as new material development, biomedicine imaging, and high density optical storage.