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Using Femtosecond Laser Pulses to Explore the Nonlinear Optical Properties of a CR-39 Polymer after being Exposed to Alpha 利用飞秒激光脉冲研究暴露于α后CR-39聚合物的非线性光学性质
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-05 DOI: 10.1364/josab.501523
mona ali, M. F. Eissa, Tarek Hassan
The effect of alpha particle radiation on nonlinear optical properties of poly(allyl diglycol carbonate) (CR-39) polymer has been investigated using the Z-scan technique. CR-39 polymers were exposed to alpha particles at different doses: 23.7 and 47.5 Gy. Alpha particles cause significant optical and chemical changes in the polymer CR-39. Data from UV-visible spectrometers revealed that when alpha particle doses increased, the absorption edge of polymer redshifted and the energy band gap decreased. Fourier transform infrared absorption spectra of alpha irradiation samples show a change in intensity and bond breakage in the chemical groups constituting the CR-39 polymer compared to the pristine one. With 100 fs laser pulses and 80 MHz repetition rate, the nonlinear absorption coefficient and nonlinear refractive index are measured for a pristine and irradiated polymer with different alpha doses at different excitation wavelengths and laser peak power. The samples displayed a negative nonlinear refractive index and reverse saturable absorption behavior with three photons absorption. The results reveal that the nonlinear optical properties of CR-39 were enhanced by alpha particle radiation.
采用z扫描技术研究了α粒子辐射对聚碳酸二烯丙基二甘醇(CR-39)聚合物非线性光学性质的影响。CR-39聚合物暴露于不同剂量的α粒子:23.7 Gy和47.5 Gy。α粒子在聚合物CR-39中引起显著的光学和化学变化。紫外可见光谱数据表明,随着α粒子剂量的增加,聚合物的吸收边红移,能带隙减小。α辐照样品的傅里叶变换红外吸收光谱显示,与原始样品相比,构成CR-39聚合物的化学基团的强度和键断裂发生了变化。在100fs激光脉冲和80mhz重复频率下,测量了不同辐照剂量、不同激发波长和激光峰值功率下原始聚合物的非线性吸收系数和非线性折射率。样品表现出负非线性折射率和反向饱和吸收行为,具有三光子吸收。结果表明,α粒子辐射增强了CR-39的非线性光学性质。
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引用次数: 0
Bond model of Second Harmonic Generation inTetragonal and Orthorhombic Perovskite Structure 二次谐波生成的正交和正交钙钛矿结构键模型
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-05 DOI: 10.1364/josab.499753
Hendradi Hardhienata, Hasan Al Kharfan, Salim Faci, Muhammad Birowosuto, Husin Alatas
We apply the simplified-bond-hyperpolarizability model (SBHM) to investigate second harmonic generation (SHG) from tetragonal and orthorhombic methylammonium (MA) lead (Pb) iodide (I) perovskite structures. Assuming that the SHG radiation comes from the anharmonic charges parallel to the Pb-I covalent bond vectors, we show explicitly how the reflective rotational anysotropy SHG (RASHG) intensity profiles arise via dipole superposition from the perovskite surface and that their bulk contribution is zero for both the tetragonal and orthorhombic bulk structures if the contribution from MA molecules can be neglected. In addition, we compare the third order susceptibility tensor obtained from group theory and SBHM and calculate the values for the nonzero components as well as derive the SHG intensity field formulas. We found that the tetragonal and orthorhombic perovskite SHG intensity profiles are different. Furthermore, our results show that even in relative complex systems such as metal halide perovskites (MHPs), RASHG experimental data can be fitted using only one independent fitting parameter, which is the effective Pb-I nonlinear hyperpolarizability. Therefore, the analysis of perovskite using an anharmonic bond model can lead to better efficiencies of photovoltaic devices, while it will also pave a way for the use of SHG in MHP crystals as frequency conversion and optical signal processing.
我们应用简化键超极化模型(shhm)研究了四方和正交甲基铵(MA)碘化铅(Pb) (I)钙钛矿结构的二次谐波产生(SHG)。假设SHG辐射来自平行于Pb-I共价键向量的非调和电荷,我们明确地展示了反射旋转任意各向异性SHG (RASHG)强度分布是如何通过钙钛矿表面的偶极叠加产生的,并且如果MA分子的贡献可以忽略,那么它们对四方和正交体结构的体积贡献都为零。此外,我们还比较了由群理论和shbhm得到的三阶磁化率张量,计算了非零分量的值,并推导了SHG强度场公式。我们发现,四方型和正交型钙钛矿的SHG强度分布是不同的。此外,我们的研究结果表明,即使在金属卤化物钙钛矿(MHPs)等相对复杂的体系中,RASHG实验数据也可以仅使用一个独立的拟合参数进行拟合,即有效Pb-I非线性超极化率。因此,使用非谐波键模型分析钙钛矿可以提高光伏器件的效率,同时也为在MHP晶体中使用SHG作为频率转换和光信号处理铺平了道路。
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引用次数: 0
Rydberg excitation through detuned microwave1transition in rubidium 铷中失谐微波跃迁的里德伯激发
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-05 DOI: 10.1364/josab.502442
Erik Brekke, Cordell Umland
We study the excitation of Rydberg states in warm rubidium vapor. Using an inverted wavelength excitation scheme, we observe the effect of microwave coupling between Rydberg states through electromagnetically induced transparency. We observe AC stark shifts of the Rydberg states from the microwave coupling, and demonstrate detuned excitation to a secondary Rydberg state. These results show flexibility in the excitation process and state selection necessary for a variety of wave-mixing processes using Rydberg states.
研究了热铷蒸气中里德伯态的激发。采用反向波长激励方案,通过电诱导透明观察了里德伯态之间的微波耦合效应。我们观察到从微波耦合中产生的里德伯态的交流明显位移,并证明了失谐激发到二次里德伯态。这些结果表明,在激励过程和状态选择的灵活性,必要的各种波混合过程使用里德伯态。
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引用次数: 0
Single-shot, phase-diversity phase retrieval for high-energy beam focal-spot diagnostics 用于高能光束焦点诊断的单次相位分集相位检索
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-05 DOI: 10.1364/josab.498218
Seung-Whan Bahk, Siddharth Sampat, Matthew Heimbueger, David Weiner, joseph kwiatkowski, Katelynn Bauer, Leon Waxer
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引用次数: 0
Diffraction-free distance enhancement of Bessel beams based on spatial domain phase modulation 基于空间域相位调制的贝塞尔光束无衍射距离增强
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-03 DOI: 10.1364/josab.502991
Chengming lyu, Yiqi Zhang, Milivoj Belic, Yongdong Li, yongfeng kang
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引用次数: 0
Dispersion models exhibiting natural optical activity: theory of dielectric response of isotropic systems 显示自然光学活性的色散模型:各向同性系统的介电响应理论
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-03 DOI: 10.1364/josab.497572
Daniel Franta, Jiri Vohanka, Beáta Hroncová
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引用次数: 0
High-resolution biosensing with C-band guided mode Fano resonance in an all-dielectric structure 全介电结构中c波段引导模式Fano共振的高分辨率生物传感
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-03 DOI: 10.1364/josab.499221
Shahriar Farhadi, Mehdi Miri, ali farmani
An all-dielectric Fano resonance sensor is proposed, and its sensing characteristics are numerically investigated in the near-infrared region. The proposed device comprises two planar waveguides and a grating. The coupling between high- and low-quality-factor guided modes of the waveguides leads to a sharp Fano resonance at the optical communication wavelength of . Owing to the transparency of constituent dielectric layers in the near-infrared region, a sharp, low-loss Fano resonance appears in the reflection spectrum, which is favorable in sensing applications. The proposed sensor can detect small changes in the refractive index of the sensing medium as low as . The high sensitivity of a structure is promising in biochemical applications, such as measuring the refractive indices of organic solvents, the level of water content in ethanol and aqueous solutions, and blood glucose levels. The refractive index sensitivity is as high as λ =1550nm, and a figure of merit of Δ n =0.001 is achieved.
提出了一种全介质法诺谐振传感器,并对其近红外区域的传感特性进行了数值研究。所提出的器件包括两个平面波导和一个光栅。波导的高质量因子和低质量因子导模之间的耦合导致在光通信波长处出现尖锐的法诺共振。由于组成介质层在近红外区域的透明,反射光谱中出现了一个尖锐的低损耗范诺共振,这有利于传感应用。所提出的传感器可以检测到传感介质折射率低至的微小变化。该结构的高灵敏度在生物化学应用中很有前景,例如测量有机溶剂的折射率,乙醇和水溶液中的含水量水平以及血糖水平。折射率灵敏度高达λ =1550nm,获得Δ n =0.001的优值。
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引用次数: 0
Design of a multi-core photonic crystal fiber supporting 518 OAM modes 支持518 OAM模式的多芯光子晶体光纤的设计
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-03 DOI: 10.1364/josab.501502
Qiang Liu, Mingzhu Han, Haiwei Mu, Wei Liu, Wenjing Li, Kaiyu Wang, Chao Ma, Jingwei Lv, Paul Chu, Chao Liu
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引用次数: 0
Homodyne detection-based discrete-variable quantum key distribution with heralded single-photon source 基于超前单光子源的纯差探测离散变量量子密钥分配
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-03 DOI: 10.1364/josab.499607
Yongqiang Du, Guangshen Lin, Yongkang Li, Zhang Zhenrong, Kejin Wei
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引用次数: 0
Multipole couplings and resonance shifts in array of dielectric particles at oblique incidence 斜入射下介电粒子阵列中的多极耦合和共振位移
4区 物理与天体物理 Q3 OPTICS Pub Date : 2023-10-03 DOI: 10.1364/josab.501061
Xiaosheng Zhu, Yu Xin, Chunxu Zhang, Yingjun He
In the present paper, we propose a coupled multipole model to treat the mutual interactions between nanoparticles aligned in a periodic array, which may be frequently encountered in designing metasurfaces and other functional electromagnetic structures. Our model is comprehensive in that it takes into account the electric and magnetic multipoles both up to the quadrupole order. Working under Cartesian coordinates, this model can readily give the multipole responses of the particles in an infinite array at both normal and oblique incidence. In particular, we work out the analytical expressions of the cross-multipole coupling tensors, which are much more complicated for oblique incidence than normal incidence. We invoke the Ewald method to efficiently and accurately calculate the involved lattice sum whose convergence is otherwise very slow. By quantifying the contributions from the various couplings, we are able to analyze the mechanisms of new resonances that emerge only at oblique incidence. As a prototypical example, we use this method to give physically clear explanations of and show flexible control on the resonance shifts of the multipoles of an array of silicon spheres. The power of this model makes it very promising for dealing with metasurfaces with extended areas or working at large numerical apertures.
在本文中,我们提出了一个耦合多极模型来处理排列成周期性阵列的纳米粒子之间的相互作用,这在设计超表面和其他功能电磁结构时可能经常遇到。我们的模型是全面的,因为它考虑到电和磁的多极都到四极顺序。该模型在直角坐标系下工作,可以很容易地给出在正入射和斜入射下无限阵列中粒子的多极响应。特别地,我们得到了交叉多极耦合张量的解析表达式,斜入射比正入射要复杂得多。我们使用Ewald方法来高效准确地计算所涉及的晶格和,否则其收敛速度很慢。通过量化各种耦合的贡献,我们能够分析仅在斜入射下出现的新共振的机制。作为一个典型的例子,我们用这种方法给出了物理上清晰的解释,并展示了对硅球阵列的多极共振位移的灵活控制。该模型的强大功能使其在处理具有扩展区域的超表面或在大数值孔径下工作时非常有希望。
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引用次数: 0
期刊
Journal of The Optical Society of America B-optical Physics
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