Proposed a dynamic grayscale gradient modulation system enabling multi-information analysis and encryption under multi-optical fields, establishing a new paradigm for multi-dimensional encryption of collaborative multispectral information.
Developed coumarin-based photo-responsive in situ reconstruction technology and constructed a multi-optical field coupled control system to achieve dynamic configuration of multi-information carriers.
Designed and fabricated a micro-dynamic multiple encryption device with integrated functions for information writing, erasing and rewriting, realizing stable information storage and dynamic destruction through micro/nano-optical keys.
In this work, we reported an organic dye-doped polymer-coated optical fiber optofluidic laser (FOFL) that supports whispering gallery mode (WGM) laser emission. The dye-doped polymer was coated on the outer surface of single-mode fibers (SMFs) using a simple method to fabricate a uniform and consistent solid gain film. By using coated fibers as optical microcavities for lasers, a low lasing threshold of about 0.65 μJ/mm2 was demonstrated. The stability of laser peak wavelengths under different conditions was studied, proving a certain anti-interference ability of the polymer coating. Based on the strong liquid–light interactions brought by the gain film, the application of the polymer-coated fiber laser in refractive index sensing was demonstrated by measuring shifts in laser peak wavelengths, with an obtained sensitivity of about 597.19 nm/refractive index unit (RIU). The presented FOFL design method is expected to be further developed and applied to the designs for FOFL biochemical sensors based on resonance wavelength shifts.
Shichao Song,Yijie Li,Zhuofan Yao,Jie Li,Xiangping Li,Yaoyu Cao
The advanced direct laser printing of functional devices with tunable effective index is a key research topic in numerous emerging fields, especially in micro-/nano-optics, nanophotonics, and electronics. Photosensitized nanocomposites, consisting of high-index materials (e.g., titanium dioxide, TiO2) embedded in polymer matrix, are emerging as attractive platforms for advanced additive manufacturing. Unfortunately, in the currently applied techniques, the preparation of optically functionalized structures based on these photosensitized nanocomposites is still hampered by many issues like hydrolysis reaction, high-temperature calcinations, and, especially, the complexity of experimental procedures. In this study, we demonstrate a feasible strategy for fabricating micro-/nanostructures with a flexibly manipulated effective refractive index by incorporating TiO2nanoparticles in the matrix of acrylate resin, i.e., TiO2-based photosensitized nanocomposites. It was found that the effective refractive index of nanocomposite can be easily tuned by altering the concentration of titanium dioxide nanoparticles in the monomer matrix. For TiO2nanoparticle concentrations up to 30 wt%, the refractive index can be increased over 11.3% (i.e., altering from 1.50 of pure monomer to 1.67 at 532 nm). Based on such a photosensitized nanocomposite, the grating structures defined by femtosecond laser nanoprinting can offer vivid colors, ranging from crimson to magenta, as observed in the dark-field images. The minimum printing width and printing resolution are estimated at around 70 nm and 225 nm, indicating that the proposed strategy may pave the way for the production of versatile, scalable, and functionalized opto-devices with controllable refractive indices.
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