- 标题
- 摘要
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- 实验方案
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Second-order Nonlinearity Induced Unconventional Photon Blockade
摘要： In the recent publications (Gerace and Savona, Phys. Rev. A 89(R), 031803 2014; Zhou et al., Opt. Express 24, 17332 2016), the unconventional photon blockades are studied in a three-mode-second-order-nonlinearity system with linear coupling between the two low frequency modes. In this paper, the unconventional photon blockade is studied in a complementary case with linear coupling between the two high frequency modes. By solving the master equation in the steady-state limit and calculating the zerodelay- time second-order correlation function, a strong photon antibunching is found in this three-mode-second-order-nonlinearity system. The optimal antibunching conditions are derived and the numerical simulations confirm the optimal conditions. Our scheme can be used as a tunable single-photon source.
关键词： Second-order nonlinearity,Unconventional photon blockade
更新于2025-09-09 09:28:46
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Highly Nonlinear, Dispersion Flattened Equiangular Spiral Photonic Crystal Fiber in Telecommunications Window
摘要： This paper presents an equiangular spiral (ES) cladding photonic crystal fiber (PCF) made of lead silicate glass SF57. The proposed ES-PCF exhibits a flat dispersion at the telecommunications window with high nonlinearity and low confinement loss, showing an ultra-flattened dispersion at wavelengths ranging from 1.51 to 1.81 μm (300 nm band), with confinement losses of less than 0.0031 dB/km within this wavelength range, and two zero-dispersion wavelengths at 1.55 and 1.76 μm. Moreover, this fiber also has a high nonlinear coefficient of 1285 W-1km-1 at 1.55 μm.
关键词： Photonic crystal fiber,Ultra-flattened dispersion,Confinement loss,High nonlinearity
更新于2025-09-09 09:28:46
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AIP Conference Proceedings [Author(s) ICNPAA 2018 WORLD CONGRESS: 12th International Conference on Mathematical Problems in Engineering, Aerospace and Sciences - Yerevan, Armenia (3–6 July 2018)] - Optical solitons for the cubic–quintic nonlinear Schr?dinger equation
摘要： This paper investigates the soliton solutions to nonlinear Schr¨odinger (NLS) equation with anti-cubic nonlinearity in non-kerr media. The complex form of the NLSE has been reduced to nonlinear ordinary di?erential equation (ODE) using soliton ansatz. By implementing two techniques, namely, improved projective Riccati equations method and new mapping method, the ODE is solved analytically. Consequently, various types of solitons such as bright, dark, singular, dark-singular optical soliton solutions are obtained.
关键词： cubic–quintic nonlinearity,optical solitons,new mapping method,nonlinear Schr¨odinger equation,improved projective Riccati equations method
更新于2025-09-09 09:28:46
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[IEEE 2018 19th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM) - Erlagol (Altai Republic), Russia (2018.6.29-2018.7.3)] 2018 19th International Conference of Young Specialists on Micro/Nanotechnologies and Electron Devices (EDM) - Simulation of the Heterodyne Method for Measurement of the Second Derivative of the Current-Voltage Characteristic
摘要： The analysis and simulation of the heterodyne method for measurement of the second derivative of the current-voltage characteristic is given. The model current-voltage characteristic of a silicon diode, its first and second derivatives by heterodyne method are obtained. The derived characteristics are in good agreement with the results of numerical differentiation of the current-voltage characteristic, which indicates the availability of the heterodyne method for measuring the current-voltage characteristic’s first and second derivatives.
关键词： heterodyne method,second derivative,Nonlinearity,current-voltage characteristic
更新于2025-09-09 09:28:46
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Color and brightness encoded in a common L- and M-cone pathway with expansive and compressive nonlinearities
摘要： Lights near 560 nm appear brighter when flickered, whereas lights near 520 or 650 nm appear yellower. Both effects are consistent with signal distortion within the visual pathway—brightness changes at an expansive nonlinearity, and hue shifts at a compressive one. We previously manipulated the distortion products generated by each nonlinearity to extract the temporal properties of stages of the L- and M-cone pathways that signal brightness and color before (early stages) and after (late stages) each nonlinearity. We find that the attenuation characteristics of the early and late stages are virtually identical in both pathways: The early temporal stage acts like a band-pass filter peaking at 10–15 Hz, while the late stage acts like low-pass filter with a cut-off frequency near 3 Hz. We propose a physiologically relevant model that accounts for the filter shapes and incorporates both nonlinearities within a common parvocellular pathway. The shape of the early band-pass filter is consistent with antagonism between center signals and more sluggish and delayed surround signals, while the late filter is consistent with a simple two-stage low-pass filter. Modeling suggests that the brightness change and hue shift are both initially caused by the half-wave rectification and partition of signals into ON and OFF components. However, the hue shift is probably caused by the additional effects of a later nonlinearity that compresses chromatic red and green signals. Plausible sites for the expansive half-wave rectifying nonlinearity are after surround antagonism, possibly from horizontal cells, but the compressive nonlinearity is likely to be after the late filter.
关键词： lightness/brightness,color,nonlinearity,temporal vision,flicker sensitivity,vision models
更新于2025-09-04 15:30:14
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An expansive, cone-specific nonlinearity enabling the luminance motion system to process color-defined motion
摘要： To conclude that there is a dedicated color motion system, the hypothesis that the luminance motion pathway is processing color motion due to some nonlinearity must be rejected. Many types of nonlinearities have been considered. Cavanagh and Anstis (1991) considered interunit variability in equiluminance, but they found that adding a color-defined modulation to a luminance-defined drifting modulation increased the contribution to motion. This color contribution to motion cannot be due to interunit variability in equiluminance alone because such a luminance artifact would increase the effective luminance contrast for some luminance-sensitive units and decrease it for the others, resulting in no additional contribution to motion on average. Cavanagh and Anstis considered this color contribution to motion as evidence of a dedicated color motion system, but here we show that such a color contribution to motion varies with the phase difference between the luminance and color modulations, which would not be expected if luminance- and color-defined motion were processed separately. Specifically, the contribution to motion was greater when the luminance and color modulations were aligned (i.e., 08 or 1808 phase difference), than when they were not (908 or 2708 phase difference). Such a luminance-color phase interaction was also observed when spatially interleaving luminance and color information, which suggests that the interaction occurs after some spatial integration (i.e., not at the photoreceptors). To our knowledge, this luminance-color phase interaction cannot be explained by any previously considered nonlinearity. However, it can be explained by an expansive nonlinearity occurring before the summation of the L- and M-cone pathways (i.e., before ganglion cells) and after some spatial integration (i.e., after the photoreceptors). We conclude that there is a nonlinearity that has not been considered before, enabling some color motion processing by the luminance motion system.
关键词： color,luminance artifact,motion,expansive nonlinearity,interunit variability in equiluminance
更新于2025-09-04 15:30:14
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Study of Optical Soliton Perturbation with Quadratic-Cubic Nonlinearity by Lie Symmetry and Group Invariance
摘要： Here, optical soliton perturbation with quadratic-cubic nonlinearity has been discussed by applying Lie symmetry and group invariants. The perturbation terms include third and fourth order dispersions in addition to self-steepening, intermodal dispersion and higher order dispersion effects. Using presented algorithms, Bright and dark soliton solutions are revealed.
关键词： group invariants,higher order dispersion effects,third and fourth order dispersions,optical soliton perturbation,Lie symmetry,quadratic-cubic nonlinearity,Bright and dark soliton solutions,self-steepening,intermodal dispersion
更新于2025-09-04 15:30:14