- 标题
- 摘要
- 关键词
- 实验方案
- 产品
-
[IEEE 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Budapest (2018.7.1-2018.7.5)] 2018 IEEE 2nd International Conference on Dielectrics (ICD) - Bistable Optical Functions of Polyethylene Glycol
摘要： Polyethylene glycol takes both transparent and translucent phases during the phase transition process at around room temperature. This bistability seems useful to create optical devices including 3D displays and tunable random lasers. These devices, however, require a spot-heating technique that controls the phase of each microelement. Self-heating of microelements is achievable if the electric conductivity of the polyethylene glycol is enhanced by the dissolution of alkaline halide salts.
关键词： ionic conduction,bistability,optical functions,polyethylene glycol,phase transition
更新于2025-09-23 15:23:52
-
Analysis of a Fractal Josephson Junction with Unharmonic Current-Phase Relation
摘要： In this paper, a fractal Josephson junction with unharmonic current-phase relation is analytically and numerically analyzed. This system has two, four, or no equilibrium points depending on the external direct current source and unharmonic parameter. The stability analysis of the equilibrium points is carried out. The inclusion of unharmonic current-phase relation in an ideal Josephson junction leads to an increase in the hysteresis of current-voltage characteristics. While the inclusion of fractal characteristics in insulating layer of Josephson junction with harmonic current-phase relation leads to a decrease in the hysteresis of current-voltage characteristics. The inclusion of unharmonic current-phase relation on a fractal Josephson junction leads to an increase in the hysteresis of current-voltage characteristics. The dynamical behavior map of fractal Josephson junction with unharmonic current-phase relation in amplitude and frequency of modulation current plane is depicted. For a suitable choice of modulation parameters of external current source, fractal Josephson junction with unharmonic current-phase relation can exhibit excitable mode, bistable oscillatory mode, and periodic and chaotic behaviors.
关键词： Current-voltage characteristics,Unharmonic current-phase relation,Fractal Josephson junction,Bistability,Chaotic behavior,Hysteresis
更新于2025-09-23 15:23:52
-
Resistive Switching and Nonvolatile Memory in TiO2/CuPc Nanocomposite Devices
摘要： An organic–inorganic nanocomposite has been prepared as a hybrid memory element, and a bistable data storage device has been fabricated. The composite device, consisting of a spin casted thin film of sol–gel derived titanium dioxide (TiO2) nanoparticles followed by a vacuum evaporated thin film of copper phthalocyanine (CuPc), exhibits conductance switching and nonvolatile memory phenomenon. While the single layer device with TiO2 nanoparticles showed unipolar switching characteristics, the composite device exhibited bipolar switching with highly improved performance. The erase/reset voltage for the single layer TiO2 device is 4.5 V, which reduces to |3| V for the composite device. The on/off current ratio of the composite device measured to be > 104 , which is orders of magnitude higher in comparison to that in the single layer devices. The charge transport mechanism of the devices revealed that trap-related space charge limited conduction mechanism might be responsible for the composite device while it indicates possible formation of filamentary path in the single layer TiO2 based devices leading to ohmic-like conduction. The ability of the composite device to write, erase, read, and refresh the electrical states fulfills the functionality of a dynamic random access memory having potential for next generation low cost memory applications.
关键词： Memory,bistability,phthalocyanine,nanocomposite,random access memory
更新于2025-09-23 15:22:29
-
Enhancing the Speed and Sensitivity of a Nonlinear Optical Sensor with Noise
摘要： We demonstrate how noise can be turned into a resource for optical sensing using a nonlinear cavity. The cavity is driven by a continuous-wave laser into the regime of optical bistability. Due to the influence of fluctuations, the cavity switches randomly between two metastable states. By analyzing the residence times in these two states, perturbations to the resonance frequency of the cavity can be detected. Here, such an analysis is presented as a function of the strength of the perturbation and of the noise. By increasing the standard deviation of the noise, we find that the detection speed increases monotonically while the sensitivity peaks at a finite value of the noise strength. Furthermore, we discuss how noise-assisted sensing can be optimized in state-of-the-art experimental platforms, relying solely on the minimum amount of noise present in the cavity due to its dissipation. These results open up new perspectives for the ultrafast detection of nanoparticles, contaminants, gases, or other perturbations to the resonance frequency of an optical resonator, at low powers and in noisy environments.
关键词： noise,residence times,nonlinear optical sensor,sensitivity,optical bistability,detection speed
更新于2025-09-23 15:19:57
-
Roblems, Methods, and Algorithms in Models of Physical Fundamentals of Elements of Optical Computers
摘要： This paper considers two variants of problems that arise in developing optical computers. The first variant is related to the mathematical analysis of problems of optical bistability in the case of multibeam interaction of laser radiation in nonlinear media. The existence of optical bistability is confirmed by the results of solving the boundary value problem for a system of nonlinear ordinary differential equations. In the general case of an arbitrary nonstationary process, the problem is reduced to solving a system of two nonlinear integral equations with respect to complex amplitudes describing interference patterns. The second variant of problems is devoted to studying the absorption and scattering of light by nanomaterials. As a result, a multidimensional integral equation was obtained for the complex amplitude of the electric field. A fundamentally important feature of this equation is its singularity inside a nanoparticle.
关键词： optical computer,laser interaction,mathematical model,bistability,integral equation
更新于2025-09-19 17:15:36
-
[IEEE 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Huangshan, China (2019.8.5-2019.8.8)] 2019 18th International Conference on Optical Communications and Networks (ICOCN) - Hybrid-Cavity Semiconductor Lasers for Single Mode Operation And Optical Signal Processing
摘要： Hybrid-cavity of a Fabry-Pérot (FP) cavity and a microcavity with the microcavity as a wavelength selective reflector are reported for realizing single mode semiconductor lasers. Mode coupling between a microcavity mode and a FP mode results in mode Q factor enhancement and stable single mode operation. Furthermore, optical bistability are realized in the hybrid lasers as the unbiased microcavity working as a saturable absorption. Two bistability regions are realized for the hybrid lasers around threshold current and above threshold with mode competition, and all-optical flip-flop is demonstrated.
关键词： Optical Bistability,Optical Microcavity,Semiconductor Lasers,Coupled Mode
更新于2025-09-16 10:30:52
-
Monolithic Tunable InAs/InP Broadband Quantum-Dash Laser
摘要： A two-sectioned quantum dash laser structure based on an InAs/InP chirped active region medium is investigated as a monolithic broadband tunable laser. A thorough parametric analysis on the effect of three tuning parameters (viz. injection current, cavity length, absorber-to-device length ratio) on the optical power-injection current (L-I) and spectral characteristics, particularly wavelength tunability and bandwidth broadening, is performed. A total emission wavelength tunability of ～20 nm is demonstrated in the mid-L-band (～1600 to ～1620 nm) window and ～2 times enhancement in the 3dB bandwidth. Furthermore, optical bistability in the two-sectioned InAs/InP quantum-dash laser device is observed at near room temperature in the form of L-I curve hysteresis. Further investigation displayed a direct relation between the absorber length and the hysteresis loop width with a maximum value of ～40 mA is demonstrated; a potential platform in fast optical switching and modulation applications. Finally, the two-sectioned structure is also proposed and investigated as a monolithic two-segment contact spectrum shaper to manipulate the lasing spectrum pro?les to attain ?at tops and effectively increase the spectrum 3dB bandwidth. As such, a maximum 3dB bandwidth was able to be pushed up to ～20 nm from ～7 nm by proper tuning of the current density distribution across the two segments of the device.
关键词： optical bistability,tunable lasers,L-band lasers,Broadband lasers,quantum-dash lasers,multi-segment lasers,quantum-dot lasers,two-section lasers
更新于2025-09-16 10:30:52
-
Bistability of Multiwalled Carbon Nanotubes Arranged on Plane Substrates
摘要： Stationary states of multi-walled carbon nanotubes have been studied. The numerical simulation showed that nanotubes become bistable systems at rather large diameters. They can be in two stable states in spite of the interaction with substrates: in an open state with a hollow internal cavity and in a collapsed state. The interaction with a plane substrate leads to the nanotube flattening, making its transition to a collapsed state more energetically preferable (the stronger the interaction, the more preferable is the transition). It is shown that a change in the multilayer nanotube shape due to its interaction with the substrate or due to its collapse leads to a sharp increase in the number of its collective eigenmodes, in which all its layers take part. The energy profile of the transition is found between the steady states of the nanotube; the profile is a strongly asymmetric double-well potential with the first narrow minimum, which corresponds to the collapsed state and the second broad minimum, which corresponds to the nanotube open state.
关键词： double-well potential,multi-walled nanotube,plane substrate,nanotube collapse,bistability
更新于2025-09-12 10:27:22
-
[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - New Molecular-Based Materials for Enabling Electro-Optical Bistability in the Silicon Photonics Platform
摘要： Electro-optical bistability is a functionality which can be crucial for a wide range of applications as it can enable non-volatile and ultra-low power switching performance. We investigate the integration of a molecular-based material presenting a Spin Crossover (SCO) effect in the silicon platform for enabling optical bistability. The SCO phenomenon involves a switching process between two molecular spin states. This spin transition comes along with a change in the optical refractive index that can be switched by different external stimuli such as a variation of temperature or light irradiation and which has a hysteretic behaviour. The SCO material can be synthetized as nanoparticles so that it can be easily integrated in the silicon platform and have the potential to allow switching at room temperature.
关键词： switching,molecular material,silicon photonics,optical bistability,non-volatile
更新于2025-09-12 10:27:22
-
Organic WORM memory with carbon nanoparticle/epoxy active layer
摘要： Following the “All With One (AW1)” technology proposed in our earlier work, the present study is focused on the production and the characterization of write once read many (WORM) memory devices with a carbon nanoparticle/epoxy resin nanocomposite, where the main advantage stands on the ease of production of the nanostructured phase. The results revealed that short 100-ns, low-voltage (5.0-V) electric pulses are enough to record a bit, and the bit one to bit zero current state ratio ION∕IOFF reaches 107.
关键词： Organic WORM memory,epoxy resin,carbon nanoparticle,nanocomposite,electrical bistability
更新于2025-09-10 09:29:36