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Colors with plasmonic nanostructures: A full-spectrum review
摘要： Since ancient times, plasmonic structural coloring has inspired humanity; glassmakers achieved vibrant colors by doping glass with metal nanoparticles to craft beautiful objects such as the Roman Lycurgus cup and stained glass. These lovely color ?ltering effects are a consequence of the resonant coupling of light and free electrons in metal nanoparticles, known as surface plasmons. Thanks to the continuing improvement of nanofabrication technology, the dimensions of nanoparticles and structures can now be precisely engineered to form “optical nanoantennas,” allowing for control of optical response at an unprecedented level. Recently, the ?eld of plasmonic structural coloring has seen extensive growth. In this review, we provide an up-to-date overview of various plasmonic color ?ltering approaches and highlight their uses in a broad palette of applications. Various surface plasmon resonance modes employed in the plasmonic color ?ltering effect are discussed. We ?rst review the development of the pioneering static plasmonic colors achieved with invariant optical nanoantennas and ambient environment, then we address a variety of emerging approaches that enable dynamic color tuning, erasing, and restoring. These dynamic color ?lters are capable of actively changing the ?ltered colors and carrying more color information states than the static systems. Thus, they open an avenue to high-density data storage, information encryption, and plasmonic information processing. Finally, we discuss the challenges and future perspectives in this exciting research area.
关键词： information encryption,surface plasmons,dynamic color tuning,plasmonic information processing,plasmonic structural coloring,optical nanoantennas,high-density data storage
更新于2025-09-23 15:19:57
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Reversible 3D laser printing of perovskite quantum dots inside a transparent medium
摘要： The three-dimensional (3D) patterning of semiconductors is potentially important for exploring new functionalities and applications in optoelectronics. Here, we show that it is possible to write on demand 3D patterns of perovskite quantum dots (QDs) inside a transparent glass material using a femtosecond laser. By utilizing the inherent ionic nature and low formation energy of perovskite, highly luminescent CsPbBr3 QDs can be reversibly fabricated in situ and decomposed through femtosecond laser irradiation and thermal annealing. This pattern of writing and erasing can be repeated for many cycles, and the luminescent QDs are well protected by the inorganic glass matrix, resulting in stable perovskite QDs with potential applications such as high-capacity optical data storage, information encryption and 3D artwork.
关键词： perovskite quantum dots,optical data storage,femtosecond laser,transparent medium,information encryption,3D laser printing,3D artwork
更新于2025-09-12 10:27:22
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An Adaptive Triangular Partition Algorithm for Digital Images
摘要： The partition method is essential to image processing and applications, such as data encryption, image denoising, and three-dimensional reconstruction. In order to obtain the partition by considering the characteristics of the gray distribution in the image, a novel approach named image adaptive triangular partition (IATP) is proposed in this paper. This method considers the pixel gray distribution, which can eliminate the common edges among the adjacent triangles and can availably reduce the distortion phenomenon. The gray values and positions of the pixels are regarded as the fitting data and then fitted using the least squares method. If the calculated error is bigger than the preselected precision control value, the current region will be split into four separated triangular sub-domains using the self-similar partition method. Otherwise, the terminal operation is reached. The whole image triangular mesh is obtained by using the recursion approach, and the necessary mesh information is recorded in quaternary representation as the result. The experimental results demonstrate that the performance of the IATP method proposed in this paper is better than the existing state-of-the-art nonuniform partitions, and it solves the redundant coding problem and reduces the image quality loss. Moreover, two applications of image steganography and information encryption verify the feasibility and robustness of the new algorithm.
关键词： image adaptive triangular partition (IATP),Image processing,information encryption,least squares method,image steganography
更新于2025-09-10 09:29:36
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Metasurfaces for independent manipulation of the wavefronts in the different states of phase change materials
摘要： Metasurfaces have attracted increasing attention due to their extraordinary capability in the arbitrary control of electromagnetic waves. However, most metasurfaces lack flexibility and only enable fixed optical performance once fabricated. In this work, we propose ultra-thin metasurfaces with varied functionalities using phase change materials (PCMs) when phase change occurs on whole structured PCMs, which has not been found in previous reports. The wavefronts in the amorphous and crystalline states of the PCMs can be arbitrarily and independently modulated with high efficiency (～60% and ～40% in the two states, respectively). This work may be valuable for information encryption and optical communications.
关键词： wavefront manipulation,metasurfaces,information encryption,phase change materials,optical communications
更新于2025-09-09 09:28:46