ACS Applied Polymer Materials
·
2024
·
IF 4.4
Bin Guo,Mingxuan Wang,Diqin Zhang,Minyuan Sun,Haoqiang Gao,Yong Bi,Yuxia Zhao
The refractive index modulation (Δn) of photopolymers is a key performance indicator in determining their application potentials in holographic optical elements (HOEs). In this study, four fluoroelastomers (HT-HS, HT-F185, HT-L80, and HT-F197) containing hydroxyl groups as active functional groups are selected to construct low refractive index host matrices with isocyanates. Through a combination of them with high refractive index monomers, a series of transparent photopolymers are obtained. Among them, one containing 16 wt % HT-F197 has the highest sensitivity, which can record a transmission volume holographic grating (VHG) with high resolution (3600 lines/mm) and diffraction efficiency (95.76%) under exposure of a 532 nm laser. Its Δn is up to 0.054. Furthermore, a reflection VHG with high performance (4900 lines/mm resolution and 92.32% diffraction efficiency) can also be achieved. After photobleaching, its transmittance within 400–800 nm reaches 96.21%, showing great potential in the fabrication of transparent HOEs.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
高影响因子
Laser & Photonics Reviews
·
2024
·
IF 9.8
Jinming Hu,Shengting Zhu,Ying Lv,Ronghui Guo,Min Gu,Yinan Zhang
Holography, as a technique for coherent wavefront reconstruction, is extensively used in numerous optical applications such as optical imaging, 3D display, photolithography, and optical artificial intelligence. In order to achieve highly compact and functional integration with optoelectronic devices, the hologram needs to possess ultrathin thickness as well as multicolor functionality. However, its thickness is typically limited to optical wavelength ranges due to the requirement for pronounced amplitude or phase modulation, and it generally operates at a single wavelength band without wavelength-multiplexed channels. Here, the hologram is decreased thickness to sub-ten nanometers by exploiting the large refractive index and strong exciton absorption of 2D perovskites. Ultrathin perovskite holograms and holographic neural networks with high stability are successfully developed by using femtosecond laser direct writing, and their operation wavelength can be rationally tuned from 400–515 nm through halide anion engineering. Consequently, the wavelength can be multiplexed with low cross-talks by stacked perovskite nanolayers for applications of holographic display and neural networks without the usages of complex optical structures or filters. This work provides a feasible and promising technical route for integrating ultrathin, high pixel density, and multiplexed holographic structures with flat optoelectronic devices for next-generation integrated optical systems.
研究领域:
光学
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材料科学
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人工智能
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2016
·
IF 7.145
Wen She,Han Bi,Zhiwei Wen,Qinghe Liu,Xuebing Zhao,Jie Zhang,Renchao Che
A tunable response frequency is highly desirable for practical applications of microwave absorption materials but remains a great challenge. Here, hollow lightweight polydopamine@α-MnO2 microspindles were facilely synthesized with the tunable absorption frequency governed by the aspect ratio. The size of the hard template is a key factor to achieve the unique shape; the polymer layer with uniform thickness plays an important role in obtaining spindles with homogeneous size. With the aspect ratio increasing, the maximum reflection loss, as well as the absorption bandwidth (<−10 dB), increases and then decreases; meanwhile, the microwave absorption band shifts to the low frequency. The optimized aspect ratio of the cavity about the hollow polydopamine@α-MnO2 microspindles is ∼2.8. With 3 mm thickness at 9.7 GHz, the strongest reflection reaches −21.8 dB, and the width of the absorbing band (<−10 dB) is as wide as 3.3 GHz. Via electron holography, it is confirmed that strong charge accumulates around the interface between the polydopamine and α-MnO2 layers, which mainly contributes to the dielectric polarization absorption. This study proposes a reliable strategy to tune the absorption frequency via different aspect ratio polymer@α-MnO2 microspindles.
研究领域:
材料科学
·
电磁学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
APPLIED OPTICS
·
2019
·Vol. 58
·期 8
·2042-2049
·
IF 1.973
Hongpeng Liu,Rui Wang,Baohua Wang,Li Li,Xinying Jiao,Qinggong Song,Dan Yu
Reversibility and repeatability of the tensile deformation response in holographic sensors formed by highly stretchable acrylamide polymers have been investigated. The diffraction spectrum of the volume grating was used to characterize the deformation. Two-way shifts of peak wavelengths, i.e., redshift in transmission and blueshift in reflection, were observed in stretching. The reduction of the average refractive index provided experimental evidence for the physical mechanism. To achieve a linear response and high repeatability, the limitation of tensile displacement was determined as 5.0 mm, and the relevant deformation is 6.6%. This value can be considered as a boundary between the elastic and plastic deformations in samples with thicknesses less than 120 μm. There was a totally linear relation between peak wavelength and deformation within the elastic range. The reversible and repeatable deformation response validated the practical applicability of a holographic sensor.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
PubMed
高影响因子
Optical Materials Express
·
2022
·Vol. 12
·期 2
·845-853
·
IF 3.074
Jian Wang,Jian Wang,YanBo Pei,Hongyan Shi,Bo Gao,Suhua Luo
We reveal that polymerization degree is a significant factor that affects the holographic properties of glass-like photopolymer. By modulating polymerization degree, as well as changing the photosensitizer concentration, we fabricate multilayer PQ/PMMA photopolymer, exhibiting excellent performances in storage fidelity and reproduction resolution. A reflection geometry holographic disk system is established using the multilayer sample, in which a high storage density of 40.5GB/cm3 is realized. The reproduced images exhibit high quality with an average diffraction efficiency of 7.4 × 10−4 and average peak SNR of 27.4. This study provides a paradigm for the fabrication and holographic application of other photopolymers.
研究领域:
材料科学
·
光学工程
✓ 已验证
DOI
高影响因子
ADVANCED FUNCTIONAL MATERIALS
·
2024
·
IF 18.5
Zelin Zhu,Xiuping Qi,Zhihao Zhang,Xuanyu Dou,Xinxin Jiang,Yutong Liu,Shencheng Fu,Xintong Zhang,Yichun Liu
Independently-manipulated optical encryption has attracted great attention due to its high security and multiple application scenarios. Although photochromic molecules have become preferred holographic display units, the integration of dynamic modulation both in hologram and fluorescence for orthogonal encryption is still challenged. Herein, a latticed holographically steganographic array is constructed by incorporating a plasticizer (tri-o-cresyl phosphate, TOCP) into spirooxazine (SO) based polymers, thereby modulating the isomerization rate and the UV-fluorescence kinetics between SO and merocyanine (MC). The period to reach fluorescence saturated value for each information bit in the latticed device can be widely modulated between 60 and 1700 s. Based on the property, only through ultraviolet stimulation can array information gradually be converted from spatial lattice coordinates to holographic display time. Then, a hidden 3D image can be determined from rapidly updatable reconstructed hologram video with refresh rate 1.125 Hz by the above spatiotemporal dual-encryption keys. This work provides a bright path for the ultra-high safety steganography and adaptive stereoscopic imaging.
研究领域:
光学
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材料科学
·
信息安全
✓ 已验证
产品关联
DOI
高影响因子
ACS Applied Materials & Interfaces
·
2017
·
IF 7.504
Guannan Chen,Mingli Ni,Haiyan Peng,Feihong Huang,Yonggui Liao,Mingkui Wang,Jintao Zhu,V. A. L. Roy,Xiaolin Xie
Holographic photopolymer composites have garnered a great deal of interest in recent decades, not only because of their advantageous light sensitivity but also due to their attractive capabilities of realizing high capacity three-dimensional (3D) data storage that is long-term stable within two-dimensional (2D) thin films. For achieving high performance holographic photopolymer composites, it is of critical importance to implement precisely spatiotemporal control over the photopolymerization kinetics and gelation during holographic recording. Though a monochromatic blue light photoinitibitor has been demonstrated to be useful for improving the holographic performance, it is impractical to be employed for constructing holograms under green light due to the severe restriction of the First Law of Photochemistry, while holography under green light is highly desirable considering the relatively low cost of laser source and high tolerance to ambient vibration for image reconstruction. Herein, we disclose the concurrent photoinitiation and inhibition functions of the rose bengal (RB)/N-phenylglycine (NPG) system upon green light illumination, which result in significant enhancement of the diffraction efficiency of holographic polymer-dispersed liquid crystal (HPDLC) gratings from zero up to 87.6 ± 1.3%, with an augmentation of the RB concentration from 0.06 × 10–3 to 9.41 × 10–3 mol L–1. Interestingly, no detectable variation of the ϕ1/2kp/kt1/2, which reflects the initiation efficiency and kinetic constants, is given when increasing the RB concentration. The radical inhibition by RBH• is believed to account for the greatly improved phase separation and enhanced diffraction efficiency, through shortening the weight-average polymer chain length and subsequently delaying the photopolymerization gelation. The reconstructed colored 3D images that are easily identifiable to the naked eye under white light demonstrate great potential to be applied for advanced anticounterfeiting.
研究领域:
材料科学
·
光学工程
✓ 已验证
产品关联
DOI
PubMed
高影响因子
RSC Advances
·
2018
·Vol. 8
·期 65
·37348-37355
·
IF 2.936
Yuxuan Zhang,Shanyong Chen
In this paper, two novel azobenzene-containing poly(aryl ether)s with different absorption wavelengths were synthesized via Ullmann coupling and Sonogashira coupling, respectively. The obtained polymers were characterized and evaluated by elemental analysis, IR, 1H NMR, UV-vis, DSC and TGA. Rare earth complexes were prepared by using the two novel azobenzene-containing poly(aryl ether)s as macromolecular ligands. The obtained rare earth complexes were characterized by elemental analysis, IR and WAXD. The influence of the absorption wavelength of azobenzene chromophores on the fluorescent properties was investigated. The polymer whose absorption wavelength was far from the excitation wavelengths of the rare earth complexes showed a much larger fluorescence intensity. By exposing the films of the rare earth complexes to two interference laser beams, SRGs can be formed on the films and can also be detected by fluorescence microscopy measurement.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
PubMed
高影响因子
EUROPEAN POLYMER JOURNAL
·
2024
·
IF 5.8
Azhu Wang,Xianwei Zhao,Zhiwei Shi,Chunyu Lv,Pei Li,Jun Yu,Han Rao,Haining Chen,Huicong Liu,Weiping Li,Xiaoyu Jiang
Synthesizing highly compatible photosensitizer provides new directions for constructing high-efficiency photoinitiation systems (PSs). Here, a 2,4-Bis(4-(diethylamino)benzylidene)cyclobutanone (C4) was synthesized and used to form a three-component PSs (C4/HABI/MBO) with a biimidazole (HABI), 2-mercaptobenzoxazole (MBO). The photosensitizer has a more efficient energy transfer properties attributed to the higher fluorescence emission capacity, narrower energy band gap, lower free energy of electron transfer (Δ G et ) and improved matching with photoinitiator. Meanwhile, a double-cycle reaction mechanism is proposed, in which the improved matching seems to encourage this cycle to occur. As a result, the C4/HABI/MBO photoinitiation system well improved the diffraction efficiency of photopolymers up to 96% and demonstrated promising performance in recording and reproducing reflection holograms, which provide a new research idea for designing photoinitiation system.
研究领域:
材料科学
·
光学
✓ 已验证
产品关联
DOI
高影响因子
APPLIED OPTICS
·
2016
·Vol. 55
·期 35
·9907-9916
·
IF 1.598
Hongpeng Liu,Dan Yu,Ke Zhou,Dongyao Mao,Langbo Liu,Hui Wang,Weibo Wang,Qinggong Song
Temperature-induced diffraction spectrum responses of holographic
gratings are characterized for exploring the temperature-sensing
capability of a holographic sensor. Linear blue shift of peak
wavelength and linear diffraction reduction are observed. It provides
quantitative expressions for sensing applications. Inorganic
nanoparticles are dispersed into the binder to improve sensing
properties. Obvious improvement of sensing parameters, including
wavelength shift and diffraction change, is confirmed. The
sensitivity, response rate, and linear response region of holographic
sensors are determined to evaluate sensing capacity. Influence of
relative humidity on holographic sensing response is discussed.
Expansion of humidity range provides a probability for extending the
range of wavelength shift. Finally, the temperature response
reversibility of a holographic sensor is evaluated. These experimental
results can expand the practical application field of holographic
sensing strategy and accelerate the development of holographic
sensors.© 2016 Optical Society of
America
研究领域:
光学
·
材料科学
✓ 已验证
DOI
PubMed
高影响因子
Polymers
·
2021
·Vol. 13
·期 11
·1754
·
IF 4.329
Huishi Pi,Weiping Li,Zhiwei Shi,Haining Chen,Xiaoyu Jiang
N-vinylpyrrolidone (NVP) has a large molecular structure, so it is difficult to diffuse during holographic recording, especially at low spatial frequencies. We used glycerol to promote the diffusion of NVP, and successfully improved the holographic performance of the photopolymer at low spatial frequencies. As the concentration of glycerol increases, the holographic performance first increases and then remains stable. The optimal concentration of glycerol is 0.21 mol/L. At this concentration, the maximum diffraction efficiency of the photopolymer is 84%, the refractive index modulation is 1.95 × 10−3, and the photosensitive sensitivity is 7.91 × 10−4cm2/mJ. Compared with the control group, the maximum diffraction efficiency, maximum refractive index modulation and photosensitivity at low spatial frequencies (800 lp/mm) have increased by 11.19 times, 4.69 times and 1.71 times, respectively. Using the optimized photopolymer for transmission holographic recording and reproduction, we have obtained a clear and bright transmission hologram. The photopolymer modified with glycerol is expected to be applied to the fields of holography, diffractive optics, and so on.Keywords:transmission holography;photopolymer;polymerization rate;diffusion rate;diffraction efficiency
研究领域:
光学材料
·
全息技术
✓ 已验证
DOI
PubMed
高影响因子
LANGMUIR
·
2019
·
IF 3.683
Qingmei Peng,Xin Zhou,Zhi Wang,Qingyi Xie,Chunfeng Ma,Guangzhao Zhang,Xiangjun Gong
Surface stiffness plays a critical role in bacterial adhesion, but the mechanism is unclear since the bacterial motion before adhesion is overlooked. Herein, the three-dimensional (3D) motions of Escherichia coli and Pseudonomas sp. nov 776 onto poly(dimethylsiloxane) (PDMS) surfaces with varying stiffness before adhering were monitored by digital holographic microscopy (DHM). As Young’s modulus (E) of the PDMS surface decreases from 278.1 to 3.4 MPa, the adhered E. coli and Pseudonomas sp. decrease in number by 40.4 and 34.9%, respectively. Atomic force microscopy (AFM) measurements show that the adhesion force of bacteria to the surface declines with the decreased surface stiffness. In contrast, a nontumbling mutant of adhered E. coli (HCB1414 with the adaptive function being partially deficient) decreases much less (by 18.4%). On the other hand, the tumble frequency (Ft) of E. coli HCB1 and flick frequency (Ff) of Pseudomonas sp. increase as the surface stiffness decreases, and the motion bias (Bθ) of Pseudomonas sp. also increases. These facts clearly indicate that the bacteria have adapted responses to the surface stiffness. RNA sequencing (RNA-seq) reveals that the downregulated Cph2 and CsrA as well as the upregulated GcvA of swimming E. coli HCB1 in bulk near the softer surface promote the bacterial motility.
研究领域:
微生物学
·
生物物理学
✓ 已验证
DOI
高影响因子
危险品化学品经营许可证（带存储）