Terahertz techniques encompass a set of experimental and analytical methods that generate, manipulate, and detect electromagnetic radiation in the terahertz (THz) frequency range, typically 0.1–10 THz, for probing material properties and dynamical processes. Core approaches include time-domain spectroscopy using ultrafast lasers and nonlinear crystals or photoconductive antennas, frequency-domain spectroscopy with continuous-wave THz sources, and imaging modalities exploiting THz transmission, reflection, or near-field interactions. These techniques enable characterization of low-energy excitations, carrier dynamics, vibrational and rotational modes, and dielectric responses in solids, liquids, gases, and biological tissues, often with depth resolution and spectroscopic contrast.
The membrane protein bacteriorhodopsin is a proton pump, in which proton transport is initiated by the light-induced isomerization of the chromophore retinal. The molecular quantum states involved in this ultrafast reaction ...
Optics & Photonics
Jun 25, 2024
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Terahertz technology could help us meet the ever-increasing demand for faster data transfer rates. However, the down-conversion of a terahertz signal to arbitrary lower frequencies is difficult.
Optics & Photonics
Jun 24, 2024
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Terahertz waves are being intensely studied by researchers around the world seeking to understand the "terahertz gap." Terahertz waves have a specific frequency that puts them somewhere between microwaves and infrared light. ...
Condensed Matter
Jun 19, 2024
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Terahertz waves, known as non-ionizing radiation, can turn into ionization radiation when sufficiently many terahertz photons are focused in space and time. A team led by scientists in Korea and the U.S. has created the world's ...
Optics & Photonics
May 28, 2024
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A joint team of physicists from Skoltech, MIPT, and ITMO developed an optical component that helps manage the properties of a terahertz beam and split it into several channels. The new device can be used as a modulator and ...
Optics & Photonics
May 16, 2024
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The terahertz band is a gap band between microwave and infrared, and has shown great application potential in many cutting-edge information fields such as 6G communications. Terahertz silicon-based photonics has many advantages ...
Optics & Photonics
May 8, 2024
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In a new discovery, researchers have revealed novel insights into the behavior of water molecules confined within nanostructures. Their study, published in Science Advances on April 24, delves into how terahertz (THz) waves ...
Nanophysics
Apr 30, 2024
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High-performance active terahertz (THz) modulators are of great importance for next generation communication technology. However, they currently suffer from the tradeoff between modulation depth and speed.
Condensed Matter
Apr 8, 2024
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Perfect absorption arises from the strong interaction of valence electrons with light in a conducting material. Optical metamaterial is an effective approach to exploit the superior photon capture capability. Thus, the perfect ...
Optics & Photonics
Apr 1, 2024
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24
Electromagnetic waves in the terahertz frequency range offer many advantages for communications and advanced applications in scanning and imaging, but realizing their potential poses challenges. Researchers at Tohoku University ...
Optics & Photonics
Mar 11, 2024
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