Ultrafast Laser‐Induced Plasmonic Modulation of Optical Properties of Dielectrics at High Resolution

Abstract

The size‐ and shape‐dependent localized surface plasmon properties of metallic nanoparticles (NPs) enable nanoscale‐enhanced near‐field applications in a wide range of fields, including spectroscopy, nonlinear optics, and sensing. Orderly assembled NPs can construct plasmonic metamaterials for light manipulation at a subwavelength scale, exhibiting new collective properties in resonant modes regulated by plasmon coupling between their fundamental components. Despite the recognition of its significant advantages in photonics integration, plasmonic‐based tailored optical responses for practical applications have remained elusive due to limitations in scaling up processes, as neither etching nor assembly can design and fabricate embedded plasmonic devices into functional devices/structures. Here, the assembly of plasmonic NPs is demonstrated by ultrafast laser‐induced writing‐on‐demand inside solids, tailoring their distribution and sizes. By controlling the laser scanning speed, the in situ redistribution of NPs is observed. Plasmon mediated local energy deposition is considered as the main mechanism driving nano‐patterning at a subwavelength range. A direct nano‐printing is realized by utilizing the resonant optical response of laser‐modified NP structures/patterns. This work paves the way for directly induced NP composite structures inside transparent materials at a well‐defined and controlled depth for plasmonic applications.

Photoinduced Transition from Quasi-Two-Dimensional Ruddlesden–Popper to Three-Dimensional Halide Perovskites for the Optical Writing of Multicolor and Light-Erasable Images

“…These images can be considered as examples of high-capacity optical data storage and could meet the demands of information encryption technology, which significantly exceeds previous works on halide perovskites in terms of DPI. − Moreover, a simple projection UV lithography has been applied to the n = 2 quasi-2D perovskite films to demonstrate light-erasable luminescent labels, which may provide secure items with an advanced level of protection and accelerate the potential progress in anticounterfeiting. A further increase in resolution can be achieved by integration of the quasi-2D perovskites with various optically resonant nanostructures localizing and amplifying light at the nanoscale. − …”