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JOURNAL ARTICLE
Fengchang Li, Qiang Cao, Xiaoliang Wang, Ruonan Wang
We experimentally demonstrate the highly-efficient nonlocal erasing and writing of ferroelectric domains using a femtosecond laser in lithium niobate. Based on the induction of a focused infrared femtosecond laser without any relative displacement or additional treatment, the original multiple ferroelectric domains can be either erased (erasing operation) or elongated (writing operation) simultaneously in the crystal, depending on the laser focusing depth and the laser pulse energy. In the erasing operation, the original multiple ferroelectric domains can be cleared completely by just one laser induction, while in the writing operation, the average length of the ferroelectric domains can be elongated up to 235 µm by three laser inductions...
April 15, 2024: Optics Letters
#22
JOURNAL ARTICLE
Xin Chen, Jianhua Sang, Kang Wang, Zhuorui Zheng, Yifei Fang, Jun Wang, Xiaojun Wu, Liwei Song, Ye Tian, Yuxin Leng, Ruxin Li
The nonlinear mechanisms of polarization and optical fields can induce extensive responses in materials. In this study, we report on two kinds of nonlinear mechanisms in the topological semimetal PtSe2 crystal under the excitation of intense terahertz (THz) pulses, which are manipulated by the real and imaginary parts of the nonlinear susceptibility of PtSe2 . Regarding the real part, the broken inversion symmetry of PtSe2 is achieved through a THz-electric-field polarization approach, which is characterized by second harmonic generation (SHG) measurements...
April 15, 2024: Optics Letters
#23
JOURNAL ARTICLE
Ilya V Roslyakov, Sergey E Kushnir, Vladimir B Novikov, Andrey A Dotsenko, Dmitry M Tsymbarenko, Nina A Sapoletova, Tatiana V Murzina, Vasily S Stolyarov, Kirill S Napolskii
Photonic crystals (PCs) consisting of a periodic arrangement of holes in dielectric media have found success in light manipulation and sensing. Among them, three-dimensional (3D) PCs are in high demand due to their unique properties originating from multiple photonic band gaps (PBGs) and even full ones. Here, 3D PCs based on porous anodic aluminum oxide (AAO) were fabricated for the first time. Our approach involves prepatterning of the aluminum surface by a focused ion beam to form a hexagonal array of pore nuclei...
April 15, 2024: Journal of Physical Chemistry Letters
#24
JOURNAL ARTICLE
Wenxiang Zheng, Xuewen Fu, Ghulam Murtaza, Niu Zhang, Zihui Meng, Lei Wu, Lili Qiu
According to the Fresnel theory, the reflectivity intensity of spherical and cylindrical convex surfaces decreases from their edge to center, and it is noteworthy and interesting for optical gain to study the enhancement of center reflectance. In this paper, a polydimethylsiloxane (PDMS) - encapsulated cylindrical non-closed-packed photonic crystals (NPCs) composite with Bragg-enhanced Fresnel reflectance was designed for spectral selectivity and optical gain. Theoretically and experimentally, the periodically ordered structure of NPCs achieved high-reflection of light in photonic bandgap and high-transmission in other bands, which enhanced Fresnel reflectivity of the convex center to specific bands...
April 10, 2024: Journal of Colloid and Interface Science
#25
JOURNAL ARTICLE
Lei Gao, Donghui Kou, Ruicheng Lin, Wei Ma, Shufen Zhang
Volatile organic compounds (VOCs) have always been a major concern as a global environmental problem. As a low-cost, high-efficiency and visual sensor, photonic crystals (PCs) have been actively studied in VOCs detection. Herein, a one-dimensional PC sensor for visual sensing of highly toxic benzene series VOC vapors is prepared for the first time by integrating a new photo-crosslinked polymer-poly(styrene-benzoylphenyl acrylate) P(St-BPA) and a high specific surface area metal-organic framework (MOF) MIL-101(Cr)...
April 9, 2024: Journal of Colloid and Interface Science
#26
JOURNAL ARTICLE
Yanjin He, Jiaqi Liu, Chenwei Hu, Yongtao Wang, Lei Ma, Yanjun Guo
Low cost and strong fluorescence emission are two important guarantees for luminogens used as light conversion agents. By one-pot multicomponent approach and inexpensive starting materials, three dicyanopyridine (DP) derivatives named as DCP (2-amino-6-methoxy-4-phenylpyridine-3,5-dicarbonitrile), DCO (2-amino-6-methoxy-4-(4-methoxyphenyl) pyridine-3,5-dicarbonitrile) and DCC (2-amino-4-(4-cyanophenyl)-6-methoxypyridine-3,5-dicarbonitrile) were designed and synthesized. Meanwhile, the ACQ-to-AIE transformation was successfully realized by altering substituent groups rather than traditional rotor-stator theory...
April 2, 2024: Spectrochimica Acta. Part A, Molecular and Biomolecular Spectroscopy
#27
JOURNAL ARTICLE
Hanyu Wang, Wei Xu, Zhihong Zhu, Biao Yang
Topological Weyl semimetals are characterized by open Fermi arcs on their terminal surfaces, these materials not only changed accepted concepts of the Fermi loop but also enabled many exotic phenomena, such as one-way propagation. The key prerequisite is that the two terminal surfaces have to be well separated, i.e., the Fermi arcs are not allowed to couple with each other. Thus, their interaction was overlooked before. Here, we consider coupled Fermi arcs and propose a Weyl planar waveguide, wherein we found a saddle-chips-like hybridized guiding mode...
April 1, 2024: Nanomaterials
#28
REVIEW
Hongbo Sha, Yue Song, Yongyi Chen, Jishun Liu, Mengjie Shi, Zibo Wu, Hao Zhang, Li Qin, Lei Liang, Peng Jia, Cheng Qiu, Yuxin Lei, Yubing Wang, Yongqiang Ning, Guoqing Miao, Jinlong Zhang, Lijun Wang
Semiconductor lasers, characterized by their high efficiency, small size, low weight, rich wavelength options, and direct electrical drive, have found widespread application in many fields, including military defense, medical aesthetics, industrial processing, and aerospace. The mode characteristics of lasers directly affect their output performance, including output power, beam quality, and spectral linewidth. Therefore, semiconductor lasers with high output power and beam quality are at the forefront of international research in semiconductor laser science...
March 26, 2024: Nanomaterials
#29
JOURNAL ARTICLE
Ruth Birhanu Hayilesilassie, Abebe Belay Gemta, Fekadu Tolessa Maremi, Alemayehu Getahun Kumela, Kusse Gudishe, Bereket Delga Dana
Plasmonics and core-shell nanomaterials hold great potential to develop pharmaceuticals and medical equipment due to their eco-friendly and cost effective fabrication procedures. Despite these advancements, combating drug-resistant bacterial infections remains a global challenge. Therefore, this study aims to introduce a tailored theoretical framework for a one-dimensional (1D) photonic crystal biosensor (PCB) composed of (ZrO2 /GaN) N /defect layer/(ZrO2 /GaN) N , designed to detect Gram-positive and Gram-negative bloodstream bacteria employing the transfer matrix method (TMM)...
April 3, 2024: RSC Advances
#30
JOURNAL ARTICLE
Jianhao Chen, Xiongjian Huang, Dandan Yang, Yantong Li, Jiachang Wu, Huakang Yu, Xiaofeng Liu, Jianrong Qiu, Zhongmin Yang, Guoping Dong
The development of novel materials and structures for efficient second-order nonlinear micro/nano devices remains a significant challenge. In this study, we demonstrate the remarkable enhancement of second-harmonic generation (SHG) and even cascaded sum frequency generation (CSFG) in whispering gallery mode microspheres made of surface-crystallized glass with a 6-μm Ba2 TiSi2 O8 crystal layer. Attributed to the core-shell design, the Ba2 TiSi2 O8 located on the surface can be efficiently coupled with whispering gallery modes, resulting in a highly efficient micron-scale cavity-enhanced second-order optical nonlinearity...
April 10, 2024: Advanced Materials
#31
JOURNAL ARTICLE
Jong Hyun Kim, Jong Bin Kim, Shin-Hyun Kim
Printing structurally colored patterns is of great importance for providing customized graphics for various purposes. Although a direct writing technique has been developed, the use of colloidal dispersions as photonic inks requires delicate printing conditions and restricts the mechanical and optical properties of printed patterns. In this work, we produce elastic photonic microbeads through scalable bulk emulsification and formulate photonic inks containing microbeads for direct writing. To produce the microbeads, a photocurable colloidal dispersion is emulsified into a highly concentrated sucrose solution via vortexing, which results in spherical emulsion droplets with a relatively narrow size distribution...
April 9, 2024: ACS Applied Materials & Interfaces
#32
JOURNAL ARTICLE
Hassen Dakhlaoui, Walid Belhadj, Haykel Elabidi, Najla S Al-Shameri, Fatih Ungan, Bryan M Wong
We investigate the transmittance spectrum of a multichannel filter composed of dielectric (A) and plasma (P) materials in the microwave region within the transfer matrix formalism. Two configurations of the proposed filter are studied under the influence of an applied magnetic field: (1) a periodic structure containing (A/P)N unit cells surrounded by air and (2) the introduction of a second dielectric material (D) acting as a defect layer to produce an (AP)N/2/D/(AP)N/2 structure. Our findings reveal that in the periodic case, the number of resonant states of the transmittance increases with number N; however, the observed blue and red shifts depend on the intensity and orientation of the applied magnetic field...
January 24, 2024: Materials
#33
JOURNAL ARTICLE
Wenjing Xue, Li Wang, Kexin Yi, Lingyu Sun, Haozhen Ren, Feika Bian
Hepatocellular carcinoma (HCC), as one of the most lethal cancers, significantly impacts human health. Attempts in this area tends to develop novel technologies with sensitive and multiplexed detection properties for early diagnosis. Here, we present novel hydrogel photonic crystal (PhC) barcodes with tyramine deposition amplified enzyme-linked immunosorbent assay (ELISA) for highly sensitive and multiplexed HCC biomarker screening. Because of the abundant amino groups of acrylic acid (AA) component, the constructed hydrogel PhC barcodes with inverse opal structure could facilitate the loading of antibody probes for subsequent detection of tumor markers...
April 4, 2024: Biosensors & Bioelectronics
#34
JOURNAL ARTICLE
Varnakavi Naresh, Pil-Ryung Cha, Nohyun Lee
Rare-earth-based double perovskite (DP) X-ray scintillators have gained significant importance with low detection limits in medical imaging and radiation detection owing to their high light yield (LY) and remarkable spatial resolution. Herein, we report the synthesis of 3D double perovskite (DP) crystals, namely, Cs2 NaGdCl6 and Tb3+ -Cs2 NaGdCl6 using hydrothermal reaction. Cs2 NaGdCl6 DP single crystals exhibited a blue self-trapped exciton (STE) emission at 470 nm under ultraviolet (265 nm) excitation with a photoluminescence quantum yield (PLQY) of 8...
April 8, 2024: ACS Applied Materials & Interfaces
#35
JOURNAL ARTICLE
J Bareño-Silva, Á H Bedoya-Calle, H A Gómez-Urrea, F J Caro-Lopera
In this study, we address three key challenges in photonic crystals: modeling of isolated flat bands, electric field prediction, and band separation in dispersion relations. Using twisted square Bravais lattices at specific angles, we create Bravais-Moiré photonic crystals exhibiting unique characteristics. These include band pairing and parallelism in certain Brillouin zones, enabling predictable electric field behavior and identification of isolated, flat band pairs within extensive band gaps. We apply advanced Shape theory-based classification methods for precise band separation, offering significant contributions to photonics research and light manipulation applications...
April 15, 2024: Heliyon
#36
JOURNAL ARTICLE
Watheq Al-Basheer, Christian Viernes, Meixin Cheng, Ruofei Zheng, Sam Netzke, Kostyantyn Pichugin, German Sciaini
Over the past decade, two-dimensional (2D) layered semiconducting materials, with their distinctive structures and unique physicochemical properties, have attracted attention for potential applications in photonics and optoelectronics. In this study, we utilized time-domain broadband Brillouin scattering on a single germanium monosulfide (GeS) crystal to determine the out-of-plane longitudinal sound speed, evaluated at v L = (4035 ± 200) m/s. The reported results demonstrate the effectiveness of this nondestructive, all-optical technique for measuring the elastic properties in fragile 2D layered materials and provide the value of the out-of-plane compressive elastic constant, C = (69 ± 7) GPa...
April 2, 2024: ACS Omega
#37
JOURNAL ARTICLE
F Afzal, K Spieker, P Hurck, S Abt, P Achenbach, P Adlarson, Z Ahmed, C S Akondi, J R M Annand, H J Arends, M Bashkanov, R Beck, M Biroth, N Borisov, A Braghieri, W J Briscoe, F Cividini, C Collicott, S Costanza, A Denig, M Dieterle, E J Downie, P Drexler, S Fegan, S Gardner, D Ghosal, D I Glazier, I Gorodnov, W Gradl, D Gurevich, L Heijkenskjöld, D Hornidge, G M Huber, V L Kashevarov, S J D Kay, M Korolija, B Krusche, A Lazarev, K Livingston, S Lutterer, I J D MacGregor, R G Macrae, D M Manley, P P Martel, R Miskimen, M Mocanu, E Mornacchi, C Mullen, A Neganov, A Neiser, M Oberle, M Ostrick, P B Otte, D Paudyal, P Pedroni, A Powell, G Reicherz, T Rostomyan, C Sfienti, V Sokhoyan, O Steffen, I I Strakovsky, T Strub, I Supek, A Thiel, M Thiel, A Thomas, Yu A Usov, S Wagner, N K Walford, D P Watts, D Werthmüller, J Wettig, L Witthauer, M Wolfes, N Zachariou
We report the measurement of the helicity asymmetry E for the pπ^{0} and nπ^{+} final states using, for the first time, an elliptically polarized photon beam in combination with a longitudinally polarized target at the Crystal Ball experiment at MAMI. The results agree very well with data that were taken with a circularly polarized photon beam, showing that it is possible to simultaneously measure polarization observables that require linearly (e.g., G) and circularly polarized photons (e.g., E) and a longitudinally polarized target...
March 22, 2024: Physical Review Letters
#38
JOURNAL ARTICLE
Chawina De-Eknamkul, Wenzhuo Huang, Xingwang Zhang, Yundong Ren, Ertugrul Cubukcu
The optical response in two-dimensional transition-metal dichalcogenides (2D TMDCs) is dominated by excitons. The lack of spatial inversion symmetry in the hexagonal lattice within each TMDC layer leads to valley-dependent excitonic emission of photoluminescence. Here, we demonstrate experimentally the spatial separation of valley coherent emission into orthogonal directions through self-resonant exciton polaritons of a free-standing three-layer (3L) WS2 waveguide. This was achieved by patterning a photonic crystal consisting of a square array of holes allowing for the far field probing of valley coherence of engendered exciton-polaritons...
March 20, 2024: ACS Photonics
#39
JOURNAL ARTICLE
Yifan Gao, Kongyu Ge, Zhen Zhang, Zhan Li, Shaowei Hu, Hongjun Ji, Mingyu Li, Huanhuan Feng
Robust anti-counterfeiting techniques aim for easy identification while remaining difficult to forge, especially for high-value items such as currency and passports. However, many existing anti-counterfeiting techniques rely on deterministic processes, resulting in loopholes for duplication and counterfeiting. Therefore, achieving high-level encryption and easy authentication through conventional anti-counterfeiting techniques has remained a significant challenge. To address this, this work proposes a solution that combined fluorescence and structural colors, creating a physically unclonable multiplex encryption system (PUMES)...
April 4, 2024: Advanced Science (Weinheim, Baden-Wurttemberg, Germany)
#40
JOURNAL ARTICLE
R Mitsuhashi, B S Song, K Inoue, T Asano, S Noda
In a previous work, we demonstrated a coupled cavity system where photons in one storage cavity can be transferred to another storage cavity at an arbitrary time by applying a voltage pulse to a third cavity placed in a p-i-n junction. In this work, we demonstrate methods to improve the transfer efficiency and photon lifetimes of such a coupled system. Firstly, we designed a photonic-crystal structure that achieves a large coupling coefficient without reducing the radiation quality factor compared to the previously proposed structure: The photonic-crystal design was changed to a more symmetric configuration to suppress radiation losses and then optimized using an automatic structure tuning method based on the Covariance Matrix Adaptive Evolutional Strategy (CMAES)...
March 11, 2024: Optics Express
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