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  • World Scientific Pub Co Pte Ltd  (33)
  • Physics  (33)
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  • World Scientific Pub Co Pte Ltd  (33)
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  • Physics  (33)
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  • 1
    Online Resource
    Online Resource
    Multi-functional gallium arsenide photonic crystal polarization splitter with a gold core
    World Scientific Pub Co Pte Ltd ; 2021
    In:  Modern Physics Letters B Vol. 35, No. 14 ( 2021-05-20), p. 2150229-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 35, No. 14 ( 2021-05-20), p. 2150229-
    Abstract: A multi-functional dual-core photonic crystal fiber (PCF) polarization beam splitter with a central oval hole filled with gold is designed and described. The first layer on the circular holes around the core is filled with the nematic liquid crystal (NLC) to enhance birefringence. The full-vector finite element method is employed to study the characteristics of the polarization beam splitter and derive the optimal parameters. When the fiber length is 14.55 [Formula: see text]m, the polarized light in the [Formula: see text] - and [Formula: see text]-directions can be separated at a wavelength of 1.31 [Formula: see text] m and the bandwidths are 257 and 238 nm, respectively, for extinction ratios bigger than 10 dB. When the fiber length is 10.86 [Formula: see text]m, the polarized light in the [Formula: see text] - and [Formula: see text]-directions can be separated at a wavelength of 1.55 [Formula: see text] m and the bandwidths are 239 and 174 nm, respectively for extinction ratios larger than 10 dB. The multifunctional polarization beam splitter with an ultra-short fiber length and broad bandwidth improves the sensing performance in comparison with single-function devices and our results provide insights into the design of beam splitters with multiple functions.
    Type of Medium: Online Resource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984921502298
    RVK:
    UA 5534.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2021
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  • 2
    Online Resource
    Online Resource
    Switching on or off the optical bistability based on the interaction of double dark resonances
    World Scientific Pub Co Pte Ltd ; 2017
    In:  International Journal of Modern Physics B Vol. 31, No. 01 ( 2017-01-10), p. 1650245-
    Details
    In: International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 31, No. 01 ( 2017-01-10), p. 1650245-
    Abstract: We investigated the optical bistability (OB), which is manipulated by double dark resonances, in a [Formula: see text]-type four-level atomic system with a unidirectional ring cavity. It is found that, with the interaction of double dark resonances, the bistable threshold intensity becomes weaker and the hysteresis loop becomes narrower by tuning properly the detuning of microwave field. Also, the influence of the intensity and frequency detuning of the microwave field on switching on or off the optical bistable behavior is studied, which is used to provide the theoretical guidance for controlling and optimizing all optical switching process. Our numerical results are explained by using a dressed-state approach.
    Type of Medium: Online Resource
    ISSN: 0217-9792 , 1793-6578
    URL: Article
    DOI: 10.1142/S0217979216502453
    RVK:
    UA 4381.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2017
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  • 3
    Online Resource
    Online Resource
    Effects of oxygen partial pressure on the microstructure, electrical and optical properties of the Sn-doped In 2 O 3 thin films
    World Scientific Pub Co Pte Ltd ; 2018
    In:  Modern Physics Letters B Vol. 32, No. 24 ( 2018-08-30), p. 1850284-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 32, No. 24 ( 2018-08-30), p. 1850284-
    Abstract: The effects of oxygen partial pressure on the microstructure, electrical and photo-sensitive properties of the Sn-doped In 2 O 3 (ITO) films deposited by different Ar–O 2 flow rates (10:0.4, 10:1, 10:1.8 and 10:3) were investigated systematically by X-ray diffraction (XRD), scanning electron microscopy (SEM), atomic force microscopy (AFM), Hall effect, UV-Vis and optical measurements. The XRD and SEM measurements show that the ITO film deposited at oxygen flow rate of 0.4 sccm prefers to (400) orientation and has a rough sawtooth-shaped surface. However, the ITO films deposited at oxygen flow rates of 1 sccm, 1.8 sccm and 3 sccm prefer to (222) orientation and exhibit a flat smooth surface. The conductivity, mobility and photosensitive property of ITO films are also sensitive to oxygen flow rate. The ITO film deposited at oxygen flow rate of 0.4 sccm has a high carrier concentration (up to [Formula: see text] cm[Formula: see text] ) and mobility (16.7 cm 2 /vs), low resistivity [Formula: see text], and a lo ng response time but good sensitivity to ultraviolet light. It can be concluded that the surface morphology plays a dominant role in sensitivity to ultraviolet light. The good sensitivity of ultraviolet light is gained from the ITO film with sawtooth-shaped surface.
    Type of Medium: Online Resource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984918502846
    RVK:
    UA 5534.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2018
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  • 4
    Online Resource
    Online Resource
    A predictive deep-learning approach for homogenization of auxetic kirigami metamaterials with randomly oriented cuts
    World Scientific Pub Co Pte Ltd ; 2021
    In:  Modern Physics Letters B Vol. 35, No. 01 ( 2021-01-10), p. 2150033-
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 35, No. 01 ( 2021-01-10), p. 2150033-
    Abstract: This paper describes a data-driven approach to predict mechanical properties of auxetic kirigami metamaterials with randomly oriented cuts. The finite element method (FEM) was used to generate datasets, the convolutional neural network (CNN) was introduced to train these data, and an implicit mapping between the input orientations of cuts and the output Young’s modulus and Poisson’s ratio of the kirigami sheets was established. With this input–output relationship in hand, a quick estimation of auxetic behavior of kirigami metamaterials is straightforward. Our examples indicate that if the distributions of training and test datasets are close to each other, a good prediction is achievable. Our efforts provide a fast and reliable way to evaluate the homogenized properties of mechanical metamaterials with various microstructures, and thus accelerate the design of mechanical metamaterials for diverse applications.
    Type of Medium: Online Resource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984921500330
    RVK:
    UA 5534.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2021
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  • 5
    Online Resource
    Online Resource
    Excellent sensitivity of SnO 2 nanoparticles to formaldehyde
    World Scientific Pub Co Pte Ltd ; 2022
    In:  Modern Physics Letters B Vol. 36, No. 32n33 ( 2022-11-20)
    Details
    In: Modern Physics Letters B, World Scientific Pub Co Pte Ltd, Vol. 36, No. 32n33 ( 2022-11-20)
    Abstract: The room temperature gas sensors have always been an important research direction of the gas sensor, and the room temperature gas sensors without the assistance of the light is more valuable. The SnO 2 nanoparticles were synthesized by hydrothermal method, which showed good formaldehyde sensitivity, had the advantages of low test temperature, only [Formula: see text]C, good formaldehyde selectivity, and especially the good response to formaldehyde at room temperature. The nanostructure and gas-sensing properties were characterized by scanning electron microscopy, EDS mapping, nitrogen physical adsorption, and X-ray diffraction, X-ray photoelectron spectroscopy, transmission electron microscopy, and WS-60B gas-sensing measurement system. Compared with the reported research results, we carefully discuss the physical mechanism of the SnO 2 formaldehyde sensor with low operating temperature and good formaldehyde selectivity in this paper.
    Type of Medium: Online Resource
    ISSN: 0217-9849 , 1793-6640
    URL: Article
    DOI: 10.1142/S0217984922501767
    RVK:
    UA 5534.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2022
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  • 6
    Online Resource
    Online Resource
    TRANSITION OF BIPOLARON TO POLARONS INDUCED BY MAGNETIC IMPURITIES IN CONJUGATED POLYMERS
    World Scientific Pub Co Pte Ltd ; 2011
    In:  International Journal of Modern Physics B Vol. 25, No. 12 ( 2011-05-10), p. 1601-1610
    Details
    In: International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 25, No. 12 ( 2011-05-10), p. 1601-1610
    Abstract: Both polarons and bipolarons are composite particles with internal structures in nondegenerate conjugated polymers. A bipolaron is a spinless species with charge ±2|e|, while a polaron is a spin-bearing one (spin 1/2, charge ±|e|). Serving as charge carriers, they play an important role in the transport properties of polymer-based optoelectronic devices. By using a nonadiabatic dynamic method, the motion of a bipolaron under an external electric field is theoretically investigated in a conjugated polymer with magnetic impurities. Our results show that a bipolaron can pass through the magnetic impurities, or break down into two polarons with different spins, or be trapped by the magnetic impurities, depending on the width of the impurity region. When the width of the impurity region is comparable to the polaron width, the bipolaron is transformed into two polarons easily. As a polaron and a bipolaron possess different spin characteristics, the decomposition of bipolarons induced by the magnetic impurities may have important effect on the spin polarized transportation.
    Type of Medium: Online Resource
    ISSN: 0217-9792 , 1793-6578
    URL: Article
    DOI: 10.1142/S0217979211100400
    RVK:
    UA 4381.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2011
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  • 7
    Online Resource
    Online Resource
    A novel rumor diffusion model considering the effect of truth in online social media
    World Scientific Pub Co Pte Ltd ; 2015
    In:  International Journal of Modern Physics C Vol. 26, No. 07 ( 2015-07), p. 1550080-
    Details
    In: International Journal of Modern Physics C, World Scientific Pub Co Pte Ltd, Vol. 26, No. 07 ( 2015-07), p. 1550080-
    Abstract: In this paper, we propose a model to investigate how truth affects rumor diffusion in online social media. Our model reveals a relation between rumor and truth — namely, when a rumor is diffusing, the truth about the rumor also diffuses with it. Two patterns of the agents used to identify rumor, self-identification and passive learning are taken into account. Combining theoretical proof and simulation analysis, we find that the threshold value of rumor diffusion is negatively correlated to the connectivity between nodes in the network and the probability β of agents knowing truth. Increasing β can reduce the maximum density of the rumor spreaders and slow down the generation speed of new rumor spreaders. On the other hand, we conclude that the best rumor diffusion strategy must balance the probability of forwarding rumor and the probability of agents losing interest in the rumor. High spread rate λ of rumor would lead to a surge in truth dissemination which will greatly limit the diffusion of rumor. Furthermore, in the case of unknown λ, increasing β can effectively reduce the maximum proportion of agents who do not know the truth, but cannot narrow the rumor diffusion range in a certain interval of β.
    Type of Medium: Online Resource
    ISSN: 0129-1831 , 1793-6586
    URL: Article
    DOI: 10.1142/S0129183115500801
    RVK:
    UA 4383
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2015
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  • 8
    Online Resource
    Online Resource
    Improved lattice Boltzmann model for multi-component diffusion flow with large pressure difference
    World Scientific Pub Co Pte Ltd ; 2016
    In:  International Journal of Modern Physics C Vol. 27, No. 11 ( 2016-11), p. 1650130-
    Details
    In: International Journal of Modern Physics C, World Scientific Pub Co Pte Ltd, Vol. 27, No. 11 ( 2016-11), p. 1650130-
    Abstract: The pseudopotential lattice Boltzmann model has been widely used to solve multi-phase and multi-component flow problems. However, original pseudopotential model cannot be used in simulating diffusion flow with large pressure difference because of its limitation. In this paper, we incorporate pseudopotential model with a new form of effective mass to solve this problem based on the relationship between pressure difference and effective mass. The improved model is verified through Laplace’s law and binary immiscible Poiseuille flow. By simulating pipeline binary diffusion flow and two-inlet binary cavity jet flow, we show that the improved model can achieve larger pressure difference than pseudopotential model with traditional effective mass forms.
    Type of Medium: Online Resource
    ISSN: 0129-1831 , 1793-6586
    URL: Article
    DOI: 10.1142/S0129183116501308
    RVK:
    UA 4383
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2016
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  • 9
    Online Resource
    Online Resource
    GROWTH OF CARBON NANOTUBES ON IRON OXIDE NANOPARTICLES CATALYST DERIVED FROM IRON STORAGE PROTEIN-FERRITIN BY CVD METHOD
    World Scientific Pub Co Pte Ltd ; 2009
    In:  International Journal of Modern Physics B Vol. 23, No. 06n07 ( 2009-03-20), p. 1529-1534
    Details
    In: International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 23, No. 06n07 ( 2009-03-20), p. 1529-1534
    Abstract: Here we used the iron oxide nanoparticles derived from ferritin as catalyst for the synthesis of carbon nanotubes (CNTs) by the chemical vapor deposition (CVD) of coal gas. It has been found that the structure and morphology of CNTs can be tailored, to some degree, by varying the experimental conditions such as catalyst loading and process parameters. In addition to straight CNTs, some Y-branched CNTs were also obtained, which might be due to the sulfur species in the coal gas.
    Type of Medium: Online Resource
    ISSN: 0217-9792 , 1793-6578
    URL: Article
    DOI: 10.1142/S0217979209061214
    RVK:
    UA 4381.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2009
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  • 10
    Online Resource
    Online Resource
    THE SIMULATION ANALYSIS OF NANO- ZnO PIEZOELECTRIC FILM BASED ON SPM MICRO-CANTILEVER
    World Scientific Pub Co Pte Ltd ; 2013
    In:  International Journal of Modern Physics B Vol. 27, No. 15 ( 2013-06-20), p. 1362031-
    Details
    In: International Journal of Modern Physics B, World Scientific Pub Co Pte Ltd, Vol. 27, No. 15 ( 2013-06-20), p. 1362031-
    Abstract: In this paper, we designed the SPM micro-cantilever device with the nano- ZnO piezoelectric film, modeled and analyzed the micro-cantilever structure with ANSYS tools and comparatively analyzed the ZnO film performance in the static and dynamic mode. The results showed that: when the design size and force amplitude are same, the output voltage is 0.893 mV, deformation displacement is 32 nm, sensitivity is 0.893 mV/nN and natural frequency is 45.48 KHz in the static mode. In the dynamic mode, when the excitation frequencies close to the device first order natural frequency, the output voltage is an order of magnitude more than the voltage under the static induction and has higher sensitivity. The simulation results provide a valuable basis on producing the micro-cantilever with nano- ZnO piezoelectric film which meets the SPM system requirements.
    Type of Medium: Online Resource
    ISSN: 0217-9792 , 1793-6578
    URL: Article
    DOI: 10.1142/S0217979213620312
    RVK:
    UA 4381.B
    Language: English
    Publisher: World Scientific Pub Co Pte Ltd
    Publication Date: 2013
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