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Related Concept Videos

Capacitor With A Dielectric01:18

Capacitor With A Dielectric

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...
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...
Standing Waves in a Cavity01:28

Standing Waves in a Cavity

A household microwave and lasers are examples of standing electromagnetic waves in a cavity. When two conducting metal plates are placed parallel at the nodal planes, it creates a cavity where standing waves are formed. The cavity between the two planes is analogous to a stretched string held at the points x = 0 and x = L. Here, the distance 'L' between the two planes must be an integer multiple of half of the wavelength. The wavelengths that satisfy this condition are given by:
MOS Capacitor01:25

MOS Capacitor

A Metal-Oxide-Semiconductor (MOS) capacitor is a fundamental structure used extensively in semiconductor device technology, particularly in the fabrication of integrated circuits and MOSFETs (metal-oxide-semiconductor field-effect transistors). The MOS capacitor consists of three layers: a metal gate, a dielectric oxide, and a semiconductor substrate.
The metal gate is typically made from highly conductive materials such as aluminum or polysilicon. Beneath the metal gate lies a thin layer of...
Double Resonance Techniques: Overview01:12

Double Resonance Techniques: Overview

Double resonance techniques in Nuclear Magnetic Resonance (NMR) spectroscopy involve the simultaneous application of two different frequencies or radiofrequency pulses to manipulate and observe two distinct nuclear spins. One important application of double resonance is spin decoupling, which selectively suppresses coupling with one type of nucleus while observing the NMR signal from another nucleus, simplifying the spectrum and enhancing resolution.
Spin decoupling is usually achieved by...

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Related Experiment Video

Updated: Jun 27, 2026

Demonstration of Spin-Multiplexed and Direction-Multiplexed All-Dielectric Visible Metaholograms
08:48

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

Published on: September 25, 2020

Capability of Dielectric Resonator Based Meta-Atoms with VO2 Components for Switchable Coding and

Andriy E Serebryannikov1, Kanan Fataliyev1, Atilla O Cakmak2

  • 1Division of Physics of Nanostructures, ISQI, Faculty of Physics and Astronomy, Adam Mickiewicz University, 61-614 Poznan, Poland.

Materials (Basel, Switzerland)
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

Vanadium dioxide (VO2) meta-atoms enable switchable coding and wavefront manipulation at THz frequencies. Their functionality depends on VO2 component size, shape, and thermal state, offering tunable phase coverage for reconfigurable metasurfaces.

Keywords:
codingdielectric resonatormeta-atommetasurfacephase-change materialresonancevanadium dioxide

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Related Experiment Videos

Last Updated: Jun 27, 2026

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Published on: September 25, 2020

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces
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Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

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Simulation, Fabrication and Characterization of THz Metamaterial Absorbers
13:44

Simulation, Fabrication and Characterization of THz Metamaterial Absorbers

Published on: December 27, 2012

Area of Science:

  • Terahertz (THz) photonics
  • Metamaterials and Metasurfaces
  • Phase-Change Materials

Background:

  • Vanadium dioxide (VO2) exhibits environmentally sensitive phase transitions, making it suitable for tunable devices.
  • Metasurfaces incorporating phase-change materials offer reconfigurability for advanced optical functions.
  • Dielectric resonators are key components in designing meta-atoms for specific electromagnetic responses.

Purpose of the Study:

  • To numerically investigate VO2-based dielectric resonator meta-atoms for THz applications.
  • To explore the switching capabilities of these meta-atoms in coding and wavefront manipulation.
  • To understand how VO2 component geometry influences phase coverage switching.

Main Methods:

  • Numerical simulations of dielectric resonator meta-atoms with integrated VO2 components.
  • Analysis of THz frequency response under varying temperature conditions (insulator to metallic states of VO2).
  • Parametric study on the shape and size of VO2 elements to optimize functionality switching.

Main Results:

  • Demonstrated switchable phase coverage of reflected waves by tuning VO2 states.
  • Identified significant influence of VO2 component geometry on switching performance.
  • Highlighted distinct roles of metallic and insulator VO2 states in different switching scenarios.

Conclusions:

  • VO2-based meta-atoms show significant potential for tunable THz metasurfaces.
  • Design parameters like VO2 shape and size are critical for achieving desired switching functionalities.
  • Resonance regimes and state-dependent absorption contribute to multifunctional switching capabilities.