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相关概念视频

Absorption of Radiation01:05

Absorption of Radiation

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The rate of heat transfer by emitted radiation is described by the Stefan-Boltzmann law of radiation:
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Magnetostatic Boundary Conditions01:28

Magnetostatic Boundary Conditions

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An electric field suffers a discontinuity at a surface charge. Similarly, a magnetic field is discontinuous at a surface current. The perpendicular component of a magnetic field is continuous across the interface of two magnetic mediums. In contrast, its parallel component, perpendicular to the current, is discontinuous by the amount equal to the product of the vacuum permeability and the surface current. Like the scalar potential in electrostatics, the vector potential is also continuous...
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Temperature and Thermal Equilibrium01:11

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Heat and temperature are essential concepts for everyone every day. The study of heat and temperature is part of an area of physics known as thermodynamics. It is not always easy to distinguish heat and temperature.
The concept of temperature has evolved from the common concepts of hot and cold. The scientific definition of temperature explains more than just our sense of hot and cold. Temperature is operationally defined as the quantity measured with a thermometer. Furthermore, temperature is...
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Gauss's Law: Planar Symmetry01:27

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A planar symmetry of charge density is obtained when charges are uniformly spread over a large flat surface. In planar symmetry, all points in a plane parallel to the plane of charge are identical with respect to the charges. Suppose the plane of the charge distribution is the xy-plane, and the electric field at a space point P with coordinates (x, y, z) is to be determined. Since the charge density is the same at all (x, y) - coordinates in the z = 0 plane, by symmetry, the electric field at P...
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For a conductor in which all charges are at rest, the conductor's surface is equipotential. The electric field is always perpendicular to equipotential surfaces. Therefore, in a conductor with static charges, the electric field just outside the conductor is always perpendicular to the conductor's surface. Any tangential component of the electric field will cause charges to move inside the conductor, which will violate the electrostatic nature of the system. In an electrostatic...
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In a nonhomogeneous rod made up of steel and brass, restrained at both ends and subjected to a temperature change, several steps are involved in calculating the stress and compressive load. Due to the problem's static indeterminacy, one end support is disconnected, allowing the rod to experience the temperature change freely. Next, an unknown force is applied at the free end, triggering deformations in the rod's steel and brass portions. These deformations are then calculated and added...
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相关实验视频

Updated: Jun 5, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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温度不变的元表面具有温度不变的元表面.

Shany Zrihan Cohen1,2, Danveer Singh1,2, Sukanta Nandi1,2

  • 1Faculty of Engineering, Bar-Ilan University, Ramat-Gan 5290002, Israel.

Nanophotonics (Berlin, Germany)
|December 5, 2024
PubMed
概括
此摘要是机器生成的。

研究人员使用混合共振器开发了温度不变的纳米光子设备. 这种方法可以弥补热效应,确保在各种温度和光谱频段中稳定的光学性能.

关键词:
超光学是一种超光学.metasurfaces 是一个地表.温度不变的是温度不变.热分散的热分散热光学热光学

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相关实验视频

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科学领域:

  • 纳米光子学 纳米光子学
  • 材料科学 材料科学 材料科学
  • 光电学是指光电子产品.

背景情况:

  • 热效应显著影响材料性能,影响光电子设备.
  • 热光学 (TO) 效应,即折射率与温度 (dn/dT) 的变化,使可调节的光学设备成为可能,但在静态应用中会导致不稳定.
  • 由于温度变化,共振,振幅和相位的不良漂移发生.

研究的目的:

  • 提出一种系统的方法,以减轻纳米光子设备中热诱导的光学波动.
  • 设计具有有效TO系数为零的纳米光子组件 (dneff/dT ≈ 0).
  • 在元原子和元表面中实现温度不变的性能.

主要方法:

  • 使用由两种具有对立TO分散度 (dn/dT < 0 和 dn/dT > 0) 的材料制成的混合亚波长共振器.
  • 通过仔细选择具有相反热敏度的材料来弥补TO变化.
  • 证明方法在广泛的温度范围和广泛的光谱带的有效性.

主要成果:

  • 在工程纳米光子组件中实现了有效TO系数为零 (dneff/dT ≈ 0).
  • 证明了温度不变的共振频率,振幅和相位响应.
  • 在广泛的温度范围内对元原子和元表面的验证性能.

结论:

  • 拟议的混合共振器方法有效地减轻纳米光子学中的热效应.
  • 这种方法可以创建稳定的,温度不变的光电子设备.
  • 控制TO分散为纳米光子系统提供了先进的光操纵功能.