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Dual-band plasmon-induced transparency based on a vanadium dioxide ring resonator terahertz metamaterial 基于二氧化钒环谐振器太赫兹超材料的双频等离子体诱导透明
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-19 DOI: 10.1364/josab.503243
Yunqing Wang, peng lang, Boyu Ji, Yang Xu, Xiaowei Song, Jingquan Lin
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引用次数: 0
Simultaneous measurement of polarization rotation angle and ellipticity at the quantum noise limit 在量子噪声极限下偏振旋转角和椭圆度的同时测量
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-19 DOI: 10.1364/josab.502591
peng yang, Boya Xie, Sheng Feng
An experiment has been proposed for laser polarization signal measurement, with the rotation angle and ellipticity being measured simultaneously. The proposed experiment is immune to signal-to-noise ratio degradation due to the finite extinction ratio of polarizing elements used to construct the composite polarization measurement setup. Noise analysis is carried out to show that the proposed scheme allows one to reach the quantum noise limit in the simultaneous measurement of the polarization angle and ellipticity. This work should be of great interest for experiments such as observation of vacuum magnetic birefringence, spin-orbital interaction, material characterization, polarization microscopy, or biomedical optics.
提出了一种同时测量旋转角和椭圆度的激光偏振信号测量实验。由于用于构建复合偏振测量装置的偏振元件的消光比有限,该实验不受信噪比下降的影响。噪声分析表明,在同时测量偏振角和椭圆度时,所提出的方案可以达到量子噪声的极限。这项工作应该对真空磁双折射观察、自旋轨道相互作用、材料表征、偏振显微镜或生物医学光学等实验有很大的兴趣。
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引用次数: 0
Acceleration-free propagation of Airy pulses in pure-quartic dispersion media 纯四次色散介质中Airy脉冲的无加速传播
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-17 DOI: 10.1364/josab.502958
jinggui zhang, Yunwen Xu, Yajuan Tian
We investigate the propagation dynamics of Airy pulses in pure-quartic dispersion media both numerically and analytically. For linear propagation, our results show that Airy pulses will keep the acceleration-free propagation behaviors under the action of pure-quartic dispersion, quite different from the case in the presence of only quadratic or cubic dispersion. Another notable observation is that the optical fields will evolve to become a symmetric-shaped pulse and the oscillatory tail is gradually suppressed over long propagation. For nonlinear propagation, the Airy pulse having high powers will be shed into multiple soliton dynamics through the physical balance between anomalous pure-quartic dispersion and the Kerr nonlinear effect.
本文用数值方法和解析方法研究了Airy脉冲在纯四次色散介质中的传播动力学。对于线性传播,我们的研究结果表明,在纯四次色散作用下,Airy脉冲将保持无加速度的传播行为,与仅存在二次或三次色散的情况有很大不同。另一个值得注意的观察是,光场将演变成一个对称形状的脉冲,振荡尾在长传播过程中逐渐被抑制。在非线性传播中,高功率的Airy脉冲通过反常纯四次色散和克尔非线性效应之间的物理平衡,进入多孤子动力学。
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引用次数: 0
Innovative Graphene-Dielectric Metasurface: Harnessing Bound States in the Continuum for Advanced THz-Wave Modulation and High-Sensitivity Sensing 创新石墨烯-介电超表面:利用连续体中的束缚态用于先进的太赫兹波调制和高灵敏度传感
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-16 DOI: 10.1364/josab.501262
Zhexian Li, Yunping Qi, Zhou zihao, Bing Luo, Yaqi Wang, xiang xian wang
We introduce a metasurface capable of generating multiple bound states in the continuum (BICs). Through the rotation of two LiTaO 3 columns, the symmetry protection can be broken, resulting in a quasi-BIC with a high quality factor. The multipolar analysis of each BIC confirms that the dominant pole aligns closely with the electromagnetic field. Additionally, we demonstrate the tunability of the quasi-BIC’s quality factor by modifying the Fermi level of graphene, designing a terahertz (THz)-wave modulator with a remarkable modulation depth more than 90% and a modulation range of 36 meV, 108 meV, 30 meV, 1.2 meV, and 42 meV. Furthermore, the sensing performance of the metasurface is investigated. The sensitivity of peak1 is measured at 0.41 THz/RIU, peak2 at 0.4 THz/RIU, peak3 at 1.049 THz/RIU, peak4 at 0.34 THz/RIU, and peak5 at 1.59 THz/RIU, and the figure of merit of these BICs is calculated as 455.56RIU −1 , 62.8RIU −1 , 11,655.56RIU −1 , 17,000RIU −1 , and 7,950RIU −1 , respectively. Compared with relevant studies, our metasurface demonstrates excellent performance. The results of these studies have potential applications in sensing, optical communication, and energy harvesting, and open up possibilities for efficient control and manipulation of terahertz waves.
我们引入了一种能够在连续介质中产生多个束缚态的超表面。通过两个LiTaO 3柱的旋转,可以打破对称保护,从而产生具有高品质因数的准bic。对每个BIC的多极分析证实,主导极与电磁场密切相关。此外,我们通过改变石墨烯的费米水平,设计了一个太赫兹(THz)波调制器,其调制深度超过90%,调制范围为36 meV, 108 meV, 30 meV, 1.2 meV和42 meV,证明了准bic质量因子的可调性。此外,还研究了该超表面的传感性能。灵敏度分别为0.41 THz/RIU, 0.4 THz/RIU, 1.049 THz/RIU, 0.34 THz/RIU, 1.59 THz/RIU,这些bic的性能值分别为455.56RIU−1,62.8 RIU−1,11,655.56 RIU−1,17,000 RIU−1和7,950RIU−1。与相关研究相比,我们的超表面表现出优异的性能。这些研究结果在传感、光通信和能量收集方面有潜在的应用,并为有效控制和操纵太赫兹波开辟了可能性。
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引用次数: 0
Tunable all-fiber polarization filter based on graphene-assisted metal grating for O- and C-bands 基于石墨烯辅助金属光栅的O波段和c波段全光纤可调谐偏振滤波器
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-16 DOI: 10.1364/josab.502260
YUE WANG, Zhuo Wang, jiaqi qu, Zhi Cheng, Dongmei HUANG, Changyuan Yu
All-fiber polarization filters have important applications in optical communication, sensing, and fiber lasing. However, the incompatibility between high extinction ratio and short interaction length is a problem for miniaturization. In addition, current passive designs make polarization filters work in a fixed wavelength band, which limits the dynamic polarization control. Here, we integrate subwavelength metal gratings on graphene-covered D-shaped single-mode fibers to achieve tunable polarization filters, whose operating bandwidth has a significant improvement over previous works. In the simulation, the x -polarized mode couples effectively with the surface plasmon polariton mode and suffers extremely high transmission loss (up to ∼38dB/mm). At the same time, the y -polarized mode remains low insertion loss of ∼0.58dB/mm. By changing the chemical potential of graphene, the loss peak of the x -polarized mode can be adjusted in the range covering the wavelength bands from 1.272 to 1.353 µm or from 1.54 to 1.612 µm, which results in an adjustable broadband filter with a high extinction ratio over 20 dB. The proposed filter provides a promising polarization control scheme for integrated devices in the fields of communication, sensing, and lasing.
全光纤偏振滤波器在光通信、传感和光纤激光等领域有着重要的应用。然而,高消光比和短相互作用长度之间的不兼容性是小型化的一个问题。此外,目前的无源设计使偏振滤波器工作在固定波段,这限制了动态偏振控制。在此,我们将亚波长金属光栅集成在石墨烯覆盖的d型单模光纤上,实现了可调谐偏振滤波器,其工作带宽比以往的工作带宽有了显著的提高。在模拟中,x偏振模式与表面等离激元极化模式有效耦合,并且具有极高的传输损耗(高达~ 38dB/mm)。同时,y极化模式保持低插入损耗,约0.58dB/mm。通过改变石墨烯的化学势,可以在1.272 ~ 1.353µm或1.54 ~ 1.612µm的波长范围内调节x偏振模式的损耗峰,从而得到消光比超过20 dB的可调宽带滤波器。该滤波器为通信、传感和激光领域的集成器件提供了一种很有前途的偏振控制方案。
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引用次数: 0
Enhancing the quantum entanglement and EPR steering of a coupled optomechanical system with a squeezed vacuum field 压缩真空场增强光-力耦合系统的量子纠缠和EPR导向
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-16 DOI: 10.1364/josab.495520
Shao-Xiong Wu, Cheng-Hua Bai, Gang Li, Chang-Shui Yu, Tiancai Zhang
Quantum entanglement and Einstein-Podolsky-Rosen (EPR) steering are valuable resources in quantum information processing. How to enhance the quantum entanglement and EPR steering of coupled optomechanical systems with a weak squeezed vacuum field are studied when the displacement of detuning induced by the mechanical mode is considered. Compared with the condition that the system interacts with a vacuum environment, the quantum entanglement and EPR steering are stronger when the squeezed vacuum field is applied. A squeezed vacuum field with a large degree is not beneficial to enhance the quantum entanglement and EPR steering. Rather than the squeezing parameter of the squeezed vacuum field, the reference phase plays a vital role in this model.
量子纠缠和Einstein-Podolsky-Rosen (EPR)导向是量子信息处理中的宝贵资源。研究了在弱压缩真空场作用下,如何增强光机耦合系统的量子纠缠和EPR转向。与真空环境相互作用相比,施加压缩真空场时,系统的量子纠缠和EPR转向更强。大程度的压缩真空场不利于增强量子纠缠和EPR导向。在该模型中起关键作用的不是压缩真空场的压缩参数,而是参考相。
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引用次数: 0
Light scattering by a periodically time-modulated object of arbitrary shape: The extended boundary condition method 任意形状的周期性时调制物体的光散射:扩展边界条件法
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-12 DOI: 10.1364/josab.502171
N. Stefanou, Ioannis Stefanou, Evangelos Almpanis, Nikos Papanikolaou, Puneet Garg, Carsten Rockstuhl
A proper generalization of the extended boundary condition method to calculate the transition matrix, T , for electromagnetic scattering from a homogeneous and isotropic body of arbitrary shape, characterized by a periodically time-varying electric permittivity, is presented. The application of the method on a specific example of a spheroidal dielectric particle confirms that time modulation induces strong inelastic scattering, accompanied by energy transfer between the scatterer and the light field, when the difference of the incident wave frequency to a particle optical resonance matches an integer multiple of the modulation frequency. Moreover, it is shown that, for nonspherical scatterers, these effects can be selectively tuned by external means such as the polarization and the propagation direction of the incident light beam. The method is readily implementable in available dynamic multiple-scattering computer codes, and, because of its versatility and computational efficiency, it can offer new opportunities for studying more complex time-varying photonic structures.
本文给出了计算具有周期性时变介电常数的任意形状均匀各向同性体的电磁散射跃迁矩阵T的扩展边界条件方法的一种适当推广。该方法在球形介电粒子的具体实例上的应用证实,当入射波频率与粒子光学共振的差值匹配调制频率的整数倍时,时间调制引起强的非弹性散射,并伴有散射体和光场之间的能量传递。此外,研究表明,对于非球面散射体,这些效应可以通过入射光束的偏振和传播方向等外部手段选择性地调谐。该方法易于在现有的动态多次散射计算机代码中实现,并且由于其通用性和计算效率,为研究更复杂的时变光子结构提供了新的机会。
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引用次数: 0
Wavelength-Independent Bragg-like Reflection in Uniaxial Bi-Anisotropic Media 单轴双各向异性介质中与波长无关的类布拉格反射
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-12 DOI: 10.1364/josab.502652
Steven. Koufidis, Martin McCall
We have recently shown that a uniform birefringent medium exhibits a circular Bragg phenomenon that relies solely on resonant tuning of the medium’s parameters, rather than on a particular wavelength resonance, thus rendering its electromagnetic response arbitrarily broadband. The resonant condition, however, necessitated a chirality parameter equal to the average refractive index. Here, we demonstrate that non-axial wave propagation in an axially bi-anisotropic uniaxial medium also enacts such a response and, moreover, relaxes the severity of the tuning condition, offering a convenient platform for controlling both the location of the resonance and the corresponding bandwidth. Anomalous wave propagation at a singular point is additionally identified, in the vicinity of which a remarkably high and intrinsically broadband refractive index can be realized. Recent demonstrations of meta-media with giant and controllable chirality pave the path towards the realistic embodiment of a highly efficient optical modulator.
我们最近表明,均匀双折射介质表现出一种圆形布拉格现象,这种现象完全依赖于介质参数的共振调谐,而不是特定波长的共振,从而使其电磁响应任意宽带。然而,共振条件需要一个等于平均折射率的手性参数。在这里,我们证明了非轴向波在轴向双各向异性单轴介质中的传播也会产生这样的响应,并且放宽了调谐条件的严重性,为控制共振的位置和相应的带宽提供了方便的平台。此外,还发现了奇点处的异常波传播,在奇点附近可以实现非常高的固有宽带折射率。最近对具有巨大可控制手性的元介质的研究为实现高效光调制器铺平了道路。
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引用次数: 0
Surface absorption channels in light absorption by a 2D-material coated particle 表面吸收通道中的光吸收由二维材料包覆的粒子
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-12 DOI: 10.1364/josab.502612
Shangyu Zhang, Jian Dong, Wenjie Zhang, Lanxin Ma, LINHUA LIU
Light absorption enhancement in micro- and nanoparticles has garnered considerable attention through coated 2D materials, which are physically homogenized by surface conductivities and surface currents within the electromagnetic boundary conditions. However, the electromagnetic absorption through the surface channel remains unexamined, hindering a deeper understanding of the underlying mechanisms of light absorption. In this work, we analytically derive the effective cross sections of surface absorption for a 2D-material-coated sphere, based on the framework of Mie theory amended by the surface conductivity. Our theoretical analysis confirms the absorption unitarity in wrapped particles, whereby the total absorption is equivalent to the sum of surface and volume absorptions. Considering optical dispersion of a polar interior, we identify a blue shift in the resonance wavelength induced by the 2D coating, which leads to a decrease in material dissipation and thus volume absorption within the particle itself in spite of a large field enhancement inside the particle. Finally, through a realistic case of small graphene-wrapped MgO spheres, we illustrate the dominant role of the surface absorption channel on the mechanism of absorption enhancements.
在电磁边界条件下,通过表面电导率和表面电流的物理均匀化,微粒子和纳米粒子的光吸收增强已经引起了相当大的关注。然而,通过表面通道的电磁吸收仍然未被研究,阻碍了对光吸收潜在机制的更深入理解。在这项工作中,我们基于Mie理论的框架,通过表面电导率修正,解析导出了二维材料涂层球体的有效表面吸收截面。我们的理论分析证实了包裹粒子的吸收统一性,即总吸收等于表面吸收和体积吸收的总和。考虑到极性内部的光学色散,我们确定了二维涂层引起的共振波长蓝移,这导致材料耗散减少,从而减少了颗粒内部的体积吸收,尽管颗粒内部的场增强很大。最后,通过一个实际的小石墨烯包裹MgO球的例子,我们说明了表面吸收通道在吸收增强机制中的主导作用。
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引用次数: 0
Impact of random spatial noise of a laser beam on the probability of fluence to exceed the threshold value 激光束的随机空间噪声对影响超过阈值的概率的影响
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-12 DOI: 10.1364/josab.497901
Anton Kochetkov, Ekaterina Kocharovskaya, Efim Khazanov
The analytical expressions of the probability for a two-dimensional random function (for example, fluence of a laser beam with noise) to exceed the threshold value over a given area have been derived. The probability is fully determined only by two parameters. The first one, the product of the beam area and the squared second normalized spectral moment, has the meaning of the equivalent number of noise modes and is determined only by the spectral properties of the noise. The second parameter, on the contrary, does not depend on the noise spectrum; it is determined only by the ratio of the standard deviation to the difference between the threshold and mean values of fluence. The numerical simulations are in a good agreement with the theory. The results are generalized to several cases of practical interest.
导出了二维随机函数(例如,带噪声的激光束的影响)在给定区域上超过阈值的概率的解析表达式。概率完全由两个参数决定。第一个是波束面积与平方秒归一化谱矩的乘积,具有噪声模式的等效数的含义,仅由噪声的谱特性决定。相反,第二个参数不依赖于噪声谱;它仅由标准偏差与影响力阈值和平均值之差的比值决定。数值模拟结果与理论结果吻合较好。结果被推广到几个有实际意义的案例。
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引用次数: 2
期刊
Journal of The Optical Society of America B-optical Physics
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