Jove
Visualize
Contáctanos
JoVE
x logofacebook logolinkedin logoyoutube logo
ACERCA DE JoVE
Visión GeneralLiderazgoBlogCentro de Ayuda JoVE
AUTORES
Proceso de PublicaciónConsejo EditorialAlcance y PolíticasRevisión por ParesPreguntas FrecuentesEnviar
BIBLIOTECARIOS
TestimoniosSuscripcionesAccesoRecursosConsejo Asesor de BibliotecasPreguntas Frecuentes
INVESTIGACIÓN
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchivo
EDUCACIÓN
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualCentro de Recursos para ProfesoresSitio de Profesores
Términos y Condiciones de Uso
Política de Privacidad
Políticas

Videos de Conceptos Relacionados

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

5.0K
Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
Dielectrics are non-conducting materials with no free or loosely bound electrons. When a dielectric is...
5.0K
Gauss's Law in Dielectrics01:17

Gauss's Law in Dielectrics

5.2K
Consider a polar dielectric placed in an external field. In such a dielectric, opposite charges on adjacent dipoles neutralize each other, such that the net charge within the dielectric is zero. When a polar dielectric is inserted in between the capacitor plates, an electric field is generated due to the presence of net charges near the edge of the dielectric and the metal plates interface. Since the external electrical field merely aligns the dipoles, the dielectric as a whole is neutral. An...
5.2K
Dielectric Polarization in a Capacitor01:31

Dielectric Polarization in a Capacitor

6.1K
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...
6.1K
Susceptibility, Permittivity and Dielectric Constant01:26

Susceptibility, Permittivity and Dielectric Constant

2.9K
When placed in an external electric field, a dielectric material gets polarized. The charge density in the dielectric material is given by the sum of the bound and free charge densities, while the total charge density can also be written in terms of the total electric field. The bound charge density can be measured in terms of polarization, leading to the relationship between electric displacement and polarization.
2.9K
Electrostatic Boundary Conditions in Dielectrics01:27

Electrostatic Boundary Conditions in Dielectrics

1.9K
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 permittivity....
1.9K
Molecular Models02:00

Molecular Models

43.8K
Physical models representing molecular architectures of chemical compounds play essential roles in understanding chemistry. The use of molecular models makes it easier to visualize the structures and shapes of atoms and molecules.
43.8K

También podría leer

Artículos Relacionados

Artículos vinculados a este trabajo por autores compartidos, revista y gráfico de citas.

Ordenar por
Same author

CRISPR-Cas-Based Platform for Single-Step Quantification of Monoclonal Antibodies at Point-of-Care.

ACS sensors·2026
Same author

Ultrahigh Density Ir Single-Atom Catalysts With Synergistic Ir-Ir Pairs for Efficient Acidic Oxygen Evolution.

Angewandte Chemie (International ed. in English)·2026
Same author

A Lightweight Real-Time Tomato Leaf Disease Detection System for Edge-Based Smart Agriculture.

Sensors (Basel, Switzerland)·2026
Same author

Deciphering Site-Specific Kinetics on Shaped Pd Nanocrystals via Single-Particle Electrocatalysis.

Journal of the American Chemical Society·2026
Same author

Dynamically tunable membrane metasurfaces for infrared spectroscopy and strong light-matter interactions.

Light, science & applications·2026
Same author

Integration of 2D Materials in Radial van der Waals Heterostructure Metasurfaces.

ACS nano·2026

Video Experimental Relacionado

Updated: Feb 9, 2026

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

6.7K

Código de barras molecular basado en imágenes con metasuperficies dieléctricas pixeladas

Andreas Tittl1, Aleksandrs Leitis1, Mingkai Liu2

  • 1Institute of BioEngineering, École Polytechnique Fédérale de Lausanne (EPFL), 1015 Lausanne, Switzerland.

Science (New York, N.Y.)
|June 9, 2018
PubMed
Resumen
Este resumen es generado por máquina.

Los investigadores desarrollaron un nuevo método de imagen nanofotónica utilizando metasuperficies dieléctricas para detectar huellas moleculares en el infrarrojo medio. Esta técnica permite la identificación química sensible y el análisis de la composición de los analíticos sujetos a la superficie sin espectrometría.

Más Videos Relacionados

Fabrication Process of Silicone-based Dielectric Elastomer Actuators
10:32

Fabrication Process of Silicone-based Dielectric Elastomer Actuators

Published on: February 1, 2016

34.7K
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

6.4K

Videos de Experimentos Relacionados

Last Updated: Feb 9, 2026

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

6.7K
Fabrication Process of Silicone-based Dielectric Elastomer Actuators
10:32

Fabrication Process of Silicone-based Dielectric Elastomer Actuators

Published on: February 1, 2016

34.7K
Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

6.4K

Área de la Ciencia:

  • La nanofotónica
  • Tecnología de meta-superficie
  • Espectroscopia

Sus antecedentes:

  • Las metasuperficies ofrecen un control avanzado sobre la luz, lo que permite aplicaciones en óptica plana y enfoque de longitud de onda inferior.
  • La espectroscopia de infrarrojo medio es crucial para la identificación química y el análisis de huellas moleculares.

Objetivo del estudio:

  • Desarrollar un método nanofotónico basado en imágenes para detectar huellas moleculares en el infrarrojo medio.
  • Permitir la identificación química y el análisis de la composición de los analitos sujetos a la superficie utilizando metasuperficies.

Principales métodos:

  • Utilizó una superficie dieléctrica pixelada bidimensional con resonancias ultra nítidas sintonizadas a frecuencias discretas.
  • Desarrolló una técnica de imagen para leer las firmas de absorción molecular en múltiples puntos espectrales.
  • La información espectral traducida en un mapa de absorción espacial similar a un código de barras para imágenes químicas.

Principales resultados:

  • Detectó con éxito huellas moleculares de moléculas biológicas, polímeros y pesticidas con alta sensibilidad.
  • Demostró la capacidad para la identificación química y el análisis de la composición de los analíticos sujetos a la superficie.
  • Se obtiene la lectura de las huellas dactilares de absorción sin espectrometría, escaneo de frecuencia o piezas mecánicas.

Conclusiones:

  • El método nanofotónico basado en imágenes desarrollado proporciona un enfoque sensible y versátil para la espectroscopia de infrarrojo medio.
  • Esta técnica allana el camino para dispositivos de espectroscopia miniaturizados para aplicaciones en biosensores y monitoreo ambiental.