相关实验视频

Updated: Sep 11, 2025

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
09:33

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

6.4K

在介电元面的连续体中,多重圆柱状双极结合状态

Ruey-Lin Chern, Sheng-Wei Kao, Po-Yu Lin

    Optics express
    |August 13, 2025
    PubMed
    概括

    这项研究探讨了介电元表面的连续体 (BIC) 中的绑定状态,揭示了具有高质量因子的弗里德里希-温特根 (FW) 和对称保护 (SP) BIC. 这些BIC表现为 toroidal 双极模式,具有独特的极化特性.

    更多相关视频

    Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms08:48

    Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms

    Published on: September 25, 2020

    5.8K
    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures08:01

    Spectral and Angle-Resolved Magneto-Optical Characterization of Photonic Nanostructures

    Published on: November 21, 2019

    7.2K

    相关概念视频

    Potential Due to a Polarized Object01:29

    Potential Due to a Polarized Object

    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,...
    471
    Electrostatic Boundary Conditions in Dielectrics01:27

    Electrostatic Boundary Conditions in Dielectrics

    When an electric field passes from one homogeneous medium to another, crossing the boundary between the two mediums imparts a discontinuity in the electric field. This results in electrostatic boundary conditions that depend on the type of mediums the field propagates through.
    Consider a case where both the mediums across a boundary are two different dielectric materials. Recall that the electric field and electric displacement are proportional and related through the material's...
    1.4K
    Induced Electric Dipoles01:28

    Induced Electric Dipoles

    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...
    4.4K
    Potential Due to a Magnetized Object01:24

    Potential Due to a Magnetized Object

    Magnetic dipoles in magnetic materials are aligned when placed under an external magnetic field. For paramagnets and ferromagnets, dipole alignment occurs in the direction of the magnetic field. However, the dipoles align opposite to the field in the case of diamagnets. This state of magnetic polarization due to the external field is called magnetization. Magnetization is defined as the dipole moment per unit volume. It plays a similar role to polarization in electrostatics.
    The vector...
    355
    Dielectric Polarization in a Capacitor01:31

    Dielectric Polarization in a Capacitor

    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...
    5.0K
    Electric Dipoles and Dipole Moment01:30

    Electric Dipoles and Dipole Moment

    Consider two charges of equal magnitude but opposite signs. If they cannot be separated by an external electric field, the system is called a permanent dipole. For example, the water molecule is a dipole, making it a good solvent.
    Theoretically, studying electric dipoles leads to understanding why the resultant electric forces around us are weak. Since electric forces are strong, remnant net charges are rare. Hence, the interaction between dipoles helps us understand electrical interactions in...
    5.5K