We synthesize zinc sulfide (ZnS) nanoparticles with a diameter of ∼5 nm and formulate novel photopolymer/ZnS nanocomposites for holographic recording. By taking advantage of the photoinitibitor, composed of 3,3′-carbonylbis(7-diethylaminocoumarin) (KCD) and N-phenylglycine (NPG), with a capability of spatiotemporally tailoring the grating formation process, we successfully achieve high performance holographic photopolymer/ZnS nanocomposites with as high as 93.6% of diffraction efficiency (η), 26.6 × 10–3 of refractive index modulation (n1), 8.4 per 200 μm of dynamic range, and 9.8 cm/mJ of photosensitivity. In addition, for an aim of roughly describing the grating formation process, we establish a novel exponential correlation between the ZnS nanoparticles segregation degree (SD) and the ratio of photopolymerization gelation time (tgel) to holographic mixture viscosity (v). Finally, we reconstruct and display 3D images that are clearly identifiable to the naked eye through a master technique, opening a versatile class of potential applications in high capacity data storage, stereoadvertisements, and anticounterfeiting.
Yaning Xu,Chong Guo,Weiqi Qian,Chris R. Bowen,Ya Yang
Ferroelectric materials, owing to their unique optoelectronic effect and intrinsic polarization fields, are capable of accurately extract image features in outdoor lighting environments, which is highly challenging in machine vision systems. However, conventional ferroelectric-based vision sensors, confined to image sensing, incur latency and additional power consumption during data transmission. Here we report a dual-mode vision sensor based on a ferroelectric Bi x Sm 2-x O 3 film that achieves high-contrast imaging and storage functionalities. By strategically leveraging the photoelectric effect and the heat-sensitive characteristic of the ferroelectric polarization field, the polarization intensity of the ferroelectric film can be precisely modulated to achieve time-scale controllable photocurrent reversal, thereby significantly enhancing imaging contrast, while exploiting the non-volatile nature of the ferroelectric polarization to achieve an image storage functionality. The developed sensor array facilitates accurate extraction of target shape features, enabling high-contrast imaging in uneven light conditions. This integrated sensing-memory architecture establishes a new paradigm for robust machine vision systems operating in challenging environmental conditions.
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