共查询到18条相似文献,搜索用时 46 毫秒
1.
磁致伸缩光纤磁光光学双稳态 总被引:1,自引:0,他引:1
报道了一种基于磁致伸缩原理实现的全光纤结构磁光光学双稳态装置。与分立元件的磁光双稳系统相比较,该系统的双稳开关功率降低了2~3个数量级,实验结果与理论计算相符。 相似文献
2.
磁液磁光双稳特性的研究 总被引:1,自引:1,他引:0
本文基于磁液磁致双折射效应,实现了其磁光双稳特性的研究。理论上,建立了其磁光双稳传输模型、进行了计算机模拟,并在此基础上建立了相应的实验分析系统。研究表明:磁液薄膜具有良好的磁光双稳特性,可用作超长波红外波导器件。 相似文献
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本文首次提出一种由相干度非线性调制得到的新型光学双稳态——空间双稳态及其作用无耦合和有交叉耦合情况下,经γ/υ和υ/ν变换反馈可得到多种形式的双稳态,且给出了几种情况下的稳态特性方程、参数选择区域以及翻转条件等. 相似文献
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非线性介质光波导中的传输功率和光学双稳态 总被引:1,自引:0,他引:1
本文对结构为非线性包层/线性芯层/非线性衬底的非线性介质光波导的传输特性进行了深入的分析,给出了模场分布函数,色散关系和传输功率的一组形式统一的公式,并对其传输功率的光学双稳态特性进行了讨论. 相似文献
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电磁学中双稳态(磁滞回线)的演示已为众所周知。光学中双稳态(光滞回线)的演示方案及装置也已有报导,但可惜至今尚未见到在国内付诸实施的报导。究其原因大致有二:(1)一般中等学校没有法布里-珀罗标准具,也不具备制作它的条件; 相似文献
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研究了光学双稳系统在处理带噪声周期信号时的一种新的功能,并对输入任意周期小信号时的输出特性进行了研究。 相似文献
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In many bistable oscillating systems only one of the attractors is desired to possessing certain system performance. We present a method to drive a bistable system to a desired target attractor by annihilating the other one. This shift from bistability to monostability is achieved by augmentation of the nonlinear oscillator with a linear control system. For a proper choice of the control function one of the attractors disappears at a critical coupling strength in an control-induced boundary crisis. This transition from bistability to monostability is demonstrated with two paradigmatic examples, the autonomous Chua oscillator and a neuronal system with a periodic input signal. 相似文献
12.
One discusses phenomenologically the statics and dynamics of surface anchoring of nematic liquid crystals. In statics, for
symmetrical situations, one can induce, under the action of an external field, a surface breaking with a bifurcation between
two opposite orientations of the director. In dynamics, one shows that the surface director relaxation is intrinsically fast,
and accompanied by a transient surface shear flow. In thin cells with planar anchorings, filled by cyanobiphenyl materials
which orient normal to the plates under a strong electric field, there are now two effects which couple the relaxation of
the surface director: a static one, which favors parallel orientation and a uniform cell texture, and a transient dynamical
coupling from the surface flow, which forces π-twisted texture. With suitable electric signals, one can control the surface
bifurcations to give at will one of these two bistable textures. Results are presented which show that these mechanisms could
lead to a new class of surface controlled, fast nematic bistable displays.
Reproduced from ‘Liquid Crystals Today’ (Vol. 8, p. 1–7, 1998) by permission from Taylor and Francis. 相似文献
13.
O. Kuhn J. Genoe D. K. Maude J. -C. Portal L. Eaves M. Henini G. Hill M. Pate 《Physica E: Low-dimensional Systems and Nanostructures》1998,2(1-4)
The bipolar tunneling transport through p–i–n double barrier structures has been studied by means of simultaneous electrical transport measurements and electroluminescence spectroscopy. An “inverted” hysteresis loop is observed at the onset of the first electronic resonance in the current–voltage characteristics with an electrical ON/OFF ratio of more than two orders of magnitude. Relating the different branches of the current–voltage characteristic to the space charges accumulated throughout the structure the inverted hysteresis loop is interpreted in terms of an S-shaped current bistability. The S-shaped current bistability is similar to the current driven negative differential resistivity as known for instance from thyristor action. This analogy between the bipolar double barrier structure with alloyed n-type emitter and the thyristor will be briefly discussed. 相似文献
14.
S Dutta Gupta 《Pramana》1994,43(1):67-72
We exploit the recently reported line narrowed modes [1] for observation of bistability in a nonlinear Fabry-Perot cavity
with intracavity index modulation. We show that the frequency response of the structure exhibits larger bistability loops
for the line narrowed modes. 相似文献
15.
Jian-Feng Tian 《Optik》2011,122(15):1381-1383
Based on the nonlinear coupled mode theory, by using the reversely recursive transmission matrix method, the switching characteristics of linearly chirped nonlinear Bragg gratings (LC-NLBG) have been investigated numerically. The results show that, introducing spatial chirp in fiber gratings is helpful to widen the bistable wavelength range, and the influence of the chirp on the switching-on threshold and the on-off ratio of the bistable switching are obvious, the chirp-dependent bistability is due to the difference of the axial distribution of forward wave intensity in the gratings. 相似文献
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In this paper, we demonstrate the dynamic simulation of light traveling in a fiber ring resonator with a single coupler. Optical nonlinear phenomena including bistability, the Ikeda instability, bifurcation and chaos are studied. The Ikeda instability in ring resonator arises from the ring-cavity lifetime being much longer than the Kerr-effect response time of the fiber. The transmission curves of the bistability and the instability as function of the insertion losses (γ) and the coupling coefficients (κ) of the coupler are derived. 相似文献
17.
We present a detailed study of the reaction-diffusion patterns observed in the thiourea-iodate-sulfite (TuIS) reaction, operated in open one-side-fed reactors. Besides spatial bistability and spatio-temporal oscillatory dynamics, this proton autoactivated reaction shows stationary patterns, as a result of two back-to-back Turing bifurcations, in the presence of a low-mobility proton binding agent (sodium polyacrylate). This is the third aqueous solution system to produce stationary patterns and the second to do this through a Turing bifurcation. The stationary pattern forming capacities of the reaction are explored through a systematic design method, which is applicable to other bistable and oscillatory reactions. The spatio-temporal dynamics of this reaction is compared with that of the previous ferrocyanide-iodate-sulfite mixed Landolt system. 相似文献
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Yueh-Cheng Kuo 《Physica D: Nonlinear Phenomena》2011,240(1):78-88
We study the discrete nonlinear Schrödinger (DNLS) equations that model rotating Bose-Einstein Condensates (BEC) both analytically and numerically. Due to the difficulties associated with transformation invariant solutions, standard continuation methods may not properly follow the solution curves of the DNLS equations. We propose a quotient transformation invariant continuation method to circumvent this obstacle. We also analyze the bifurcation properties of the primal stalk solution curve corresponding to the DNLS equations for an isotropic trap. In numerical computation, the existence of a bistable region corresponding to the bound states with a 0- or 1-vortex is shown. This finding not only agrees with the physics of the experimental phenomena, but also explains why a 0- or 1-vortex may be observed within a certain region that has an angular velocity. Numerical evidence shows that trap potentials have little effect on the width of the bistable regions. In contrast, intra-component scattering length significantly affects the bistable region. 相似文献