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Related Concept Videos

Generating Electromagnetic Radiations01:10

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The German physicist Heinrich Hertz (1857–1894) was the first to generate and detect certain types of electromagnetic waves in the laboratory. Starting in 1887, he performed a series of experiments that confirmed the existence of electromagnetic waves and verified that they travel at the speed of light. Hertz used an alternating-current RLC (resistor-inductor-capacitor) circuit that resonated at a known frequency and connected it to a loop of wire. High voltages induced across the gap in...
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Carrier generation is the process by which electron-hole pairs (EHPs) are created within the semiconductor. In direct-bandgap semiconductors, such as gallium arsenide (GaAs), this occurs efficiently when energy absorption prompts valence electrons to leap into the conduction band, leaving behind holes.
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Electromagnetic waves are categorized according to their wavelengths and frequencies, giving the electromagnetic spectrum. These waves are classified as radio, infrared, ultraviolet, etc. Radio waves refer to electromagnetic radiation with wavelengths ranging from millimeters to kilometers. Radio waves are commonly used for audio communications (i.e., radios) and typically result from an alternating current in the wires of a broadcast antenna. They cover a broad wavelength range and are used...
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In 1931, physicist Ernst Ruska—building on the idea that magnetic fields can direct an electron beam just as lenses can direct a beam of light in an optical microscope—developed the first prototype of the electron microscope. This development led to the development of the field of electron microscopy. In the transmission electron microscope (TEM), electrons are produced by a hot tungsten element and accelerated by a potential difference in an electron gun, which gives them up to 400...
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Intense terahertz radiation: generation and application.

Yan Zhang1, Kaixuan Li2, Huan Zhao2

  • 1Department of Physics, Beijing Key Laboratory for Metamaterials and Devices, Beijing Advanced Innovation Center for Imaging Theory and Technology, Capital Normal University, Beijing, 100048, China. yzhang@cnu.edu.cn.

Frontiers of Optoelectronics
|January 13, 2023
PubMed
Summary
This summary is machine-generated.

Intense terahertz (THz) radiation offers new ways to control condensed matter. This review covers advanced THz generation, detection, and applications in spectroscopy and material science.

Keywords:
THz detectionTHz generationlight-matter interactionterahertz (THz) radiation

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Area of Science:

  • Condensed Matter Physics
  • Terahertz (THz) Science and Technology

Background:

  • Strong terahertz (THz) radiation is a key tool for manipulating complex condensed matter systems.
  • Advances in THz generation and detection are crucial for exploring novel physical phenomena.

Purpose of the Study:

  • To provide a comprehensive overview of intense THz radiation generation, detection, and applications.
  • To highlight recent progress and future perspectives in the field of high-intensity THz science.

Main Methods:

  • Review of tabletop intense THz sources, including photoconductive antennas (PCAs), optical rectification, and plasma-based sources.
  • Exploration of novel THz generation techniques using topological insulators, spintronic materials, and metasurfaces.
  • Summary and analysis of coherent THz detection methods and their limitations for intense THz fields.

Main Results:

  • Detailed examination of various intense THz generation techniques, showcasing their capabilities and limitations.
  • Analysis of coherent THz detection methods, identifying challenges in measuring high-intensity signals.
  • Introduction to diverse applications, including spectroscopy, nonlinear effects, and coherent magnon switching.

Conclusions:

  • Intense THz radiation is a rapidly advancing field with significant potential for fundamental research and technological applications.
  • Future research should focus on developing more efficient THz sources and advanced detection schemes.
  • The unique properties of intense THz radiation open new avenues for controlling and probing condensed matter.