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Capacitor With A Dielectric

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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.
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Related Experiment Video

Updated: Jan 25, 2026

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Demonstration of Equal-Intensity Beam Generation by Dielectric Metasurfaces

Published on: June 7, 2019

Ultrafast optical pulse shaping using dielectric metasurfaces.

Shawn Divitt^1,2, Wenqi Zhu^1,2, Cheng Zhang^1,2

¹National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.

Science (New York, N.Y.)

|May 4, 2019

Summary

Dielectric metasurfaces enable precise control over femtosecond laser pulses, offering new methods for ultrafast science and technology applications. This advanced pulse modulation supports high bandwidth and peak power with excellent spectral resolution.

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Last Updated: Jan 25, 2026

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Area of Science:

Optics and Photonics
Ultrafast Science
Nanophotonics

Background:

Ultrafast laser technologies, including chirped pulse amplifiers and frequency combs, demand advanced pulse modulation techniques.
Existing methods face limitations in handling large bandwidths and high peak powers while preserving spectral resolution.
New strategies are needed to meet the evolving requirements of cutting-edge optical research and applications.

Purpose of the Study:

To demonstrate the use of dielectric metasurfaces for shaping the temporal profile of near-infrared femtosecond pulses.
To achieve complex pulse-shaping operations, such as splitting, compression, chirping, and higher-order distortion.
To explore the potential of metasurfaces in advancing ultrafast science and technology.

Main Methods:

Utilized dielectric metasurfaces engineered for precise control over light-matter interactions.
Employed a Fourier-transform setup incorporating these metasurfaces.
Manipulated both amplitude and phase of the pulse's frequency components independently and simultaneously.

Main Results:

Successfully demonstrated tailored temporal shaping of femtosecond laser pulses.
Achieved a range of pulse-shaping operations, including compression and higher-order distortions.
Validated the capability of metasurfaces to independently control pulse amplitude and phase spectra.

Conclusions:

Dielectric metasurfaces offer a powerful platform for advanced femtosecond pulse modulation.
This technology expands the capabilities for manipulating the temporal characteristics of light.
Opens new avenues for innovation in ultrafast science and optical technologies.