导向基本模式的空间变化的极化在一个无无的周期极化尼酸盐波导中
Nasrin Moeini1, Rahman Nouroozi2
1Institute for Advanced Studies in Basic Sciences (IASBS), 444 Prof. Yousef Sobouti Blvd., 45137-66731, Zanjan, Iran.
Scientific reports
|July 2, 2025
概括
研究人员在Ti-非化酸波导中探索了光学引导模式. 他们展示了可调节光学应用的空间变异极化引导模式 (SVPGMs) 的电光控制.
科学领域:
- 光子学和光学工程的工程.
- 材料科学 (酸) 材料科学 (酸)
背景情况:
- 调查了Ti-无扩散酸 (Ti:LiNbO) 波导中的光学引导模式的复杂偏振行为.
- 解释了Ti无化诱导显著的双折度 ([公式:见文本]) 由于普通 ([公式:见文本]) 和非凡 ([公式:见文本]) 折射率的差异变化.
研究的目的:
- 分析奇点的形成,特别是C点和L线,在空间变化的极化引导模式 (SVPGMs).
- 提出并从理论上研究这些SVPGM在Ti:PPLN波导中的电光控制和调节方法.
主要方法:
- 在Ti:LiNbO和Ti:PPLN波导中进行光学模式行为的理论研究和数值计算.
- 分析波导双折射产生的极化奇点 (C点,L线) 的分析.
- 在Ti:PPLN结构中使用应用于电压的电光调的建模.
主要成果:
- 证实了SVPGM在特定传播距离上的C点和L线的形成.
- 证明,仅仅传播是不足以控制SVPGMs的.
- 在Ti:PPLN波导中通过电光手段展示了SVPGM的完全可调性.
结论:
- 电光控制为调SVPGMs提供了一种可行的方法,克服了基于传播的控制的局限性.
- 一个具体的例子表明,46.5V的应用电压可以在5毫米Ti:PPLN波导中将垂直向量模式转换为水平模式,从而创建L线奇点.
相关概念视频
Dielectric Polarization in a Capacitor
5.1K
The presence of a dielectric medium in a capacitor not only changes the voltage and capacitance but also affects the electric field. In general, dielectrics can be of two types: polar and nonpolar. In a polar dielectric, the positive and negative charges in the molecules are separated by a distance and hence have a permanent dipole moment. In contrast, no such charge separation exists in a nonpolar dielectric, however the nonpolar molecules get polarized in the presence of an external electric...
5.1K
Induced Electric Dipoles
4.4K
A permanent electric dipole orients itself along an external electric field. This rotation can be quantified by defining the potential energy because the external torque does work in rotating it. Then, the potential energy is minimum at the parallel configuration and maximum at the antiparallel configuration. While the former is a stable equilibrium, the latter is an unstable equilibrium.
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
Since the absolute value of potential energy holds no physical meaning, its zero value can be chosen as per...
4.4K
Potential Due to a Polarized Object
473
A neutral atom consists of a positively charged nucleus surrounded by a negatively charged electron cloud. When placed in an external electric field, the external electric force pulls the electrons and nucleus apart, opposite to the intrinsic attraction between the nucleus and the electrons. The opposing forces balance each other with a slight shift between the center of masses of the nucleus and the electron cloud, resulting in a polarized atom. On the other hand, a few molecules, like water,...
473
Group Polarization
35.6K
Group polarization is the strengthening of an original group attitude following the discussion of views within a group (Teger & Pruitt, 1967). That is, if a group initially favors a viewpoint, after discussion the group consensus is likely a stronger endorsement of the viewpoint. Conversely, if the group was initially opposed to a viewpoint, group discussion would likely lead to stronger opposition.
35.6K
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT)
535
Insensitive Nuclei Enhanced by Polarization Transfer (INEPT) is an advanced Nuclear Magnetic Resonance (NMR) technique specifically designed to detect and enhance the signals of low-abundance nuclei, such as carbon-13 and nitrogen-15, in small molecules. The fundamental principle behind INEPT is the transfer of polarization from a more abundant and highly polarizable nucleus, typically hydrogen-1, to the low-abundance nucleus of interest. This process effectively boosts the NMR signal of the...
535


