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相关概念视频

Relating Angular And Linear Quantities - I01:09

Relating Angular And Linear Quantities - I

8.5K
If the rotational definitions are compared with the definitions of linear kinematic variables from motion along a straight line and motion in two and three dimensions, we can observe a mapping of the linear variables to the rotational ones.
When comparing the linear and rotational variables individually, the linear variable of position has physical units of meters, whereas the angular position variable has dimensionless units of radians, as it is the ratio of two lengths. The linear velocity...
8.5K
Relating Angular And Linear Quantities - II01:05

Relating Angular And Linear Quantities - II

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In the case of circular motion, the linear tangential speed of a particle at a radius from the axis of rotation is related to the angular velocity by the relation:
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Rotation with Constant Angular Acceleration - I01:37

Rotation with Constant Angular Acceleration - I

8.4K
If angular acceleration is constant, then we can simplify equations of rotational kinematics, similar to the equations of linear kinematics. This simplified set of equations can be used to describe many applications in physics and engineering where the angular acceleration of a system is constant.
Using our intuition, we can begin to see how rotational quantities such as angular displacement, angular velocity, angular acceleration, and time are related to one another. For example, if a flywheel...
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Rotation with Constant Angular Acceleration - II01:16

Rotation with Constant Angular Acceleration - II

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Kinematics is the description of motion. The kinematics of rotational motion discusses the relationships between rotation angle, angular velocity, angular acceleration, and time. One can describe many things with great precision using kinematics, but kinematics does not consider causes. For example, a large angular acceleration describes a very rapid change in angular velocity without any consideration of its cause. Thus, rotational kinematics does not represent the laws of nature.
The first...
7.4K
Molecular Shape and Polarity03:37

Molecular Shape and Polarity

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Dipole Moment of a Molecule
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Group Polarization01:01

Group Polarization

39.2K
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.
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相关实验视频

Updated: Feb 10, 2026

Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements
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Automation of Mode Locking in a Nonlinear Polarization Rotation Fiber Laser through Output Polarization Measurements

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具有角强度的无反射线性极化旋转器

Hadi Ahmadi1, Sanchita Sarker1, Mohammad Parvinnezhad Hokmabadi1

  • 1Electrical and Computer Engineering Department, University of North Carolina at Charlotte, Charlotte, North Carolina 28223, United States.

ACS omega
|February 9, 2026
PubMed
概括

研究人员开发了一个紧的太赫兹超表面用于极化光学. 这种新性双层设计实现了接近零的反射和精确的偏振旋转,使先进光学系统的可扩展制造成为可能.

科学领域:

  • 光学和光子学 在光学和光子学.
  • 超材料是什么?超材料是什么?
  • 纳米技术 纳米技术

背景情况:

  • 集成极化光学需要紧,无对齐的旋转器,具有低反射和恒定的厚度,以实现可扩展的制造.
  • 现有的解决方案,如自然光学旋转器或复杂的超表面,在尺寸,对齐或制造兼容性方面都有局限性.

研究的目的:

  • 为了数值设计一个新的太赫兹性双层元表面.
  • 为了实现规定的线性偏振旋转,在广泛的入射角度上实现近零反射.
  • 确保设计与晶圆级制造相兼容.

主要方法:

  • 使用四倍旋转 (C4) 对称的太赫兹奇拉双层元表面的数值设计.
  • 利用C4对称性来消除交叉极化反射.
  • 实施破坏性干扰以最大限度地减少在目标共振中的共极化反射.

主要成果:

  • 设计的超表面实现了规定的线性偏振旋转,反射接近零.
  • 无反射响应在不同的旋转角度保持在恒定的设备厚度.
  • 该结构表现出强大的角度强度,在高达~20°的冲击角下保持无反射.

结论:

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Direct Imaging of Laser-driven Ultrafast Molecular Rotation

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  • 开发的太赫兹超表面为极化旋转提供了一个紧的,无对齐的解决方案,用于低反射的极化旋转.
  • 这种设计克服了自然光学旋转器和现有的超表面的局限性,使得可扩展的晶圆级制造成为可能.
  • 潜在的应用包括安全的光通信,并行光子处理和先进的成像.