terahertz radiation

(noun)

Electromagnetic waves with frequencies around one terahertz.

Related Terms

Examples of terahertz radiation in the following topics:

  • Microwaves

    • The boundaries between far infrared light, terahertz radiation, microwaves, and ultra-high-frequency radio waves are fairly arbitrary.
    • EHF runs the range of frequencies from 30 to 300 gigahertz, above which electromagnetic radiation is considered as far infrared light, also referred to as terahertz radiation.
    • The sun also emits microwave radiation, although most of it is blocked by Earth's atmosphere.
    • The Cosmic Microwave Background Radiation (CMBR) is microwave radiation that permeates all of space, and its discovery supports the Big Bang theory of the origin of the universe.
    • Cosmic background radiation of the Big Bang mapped with increasing resolution.

  • Photon Energies of the EM Spectrum

    • The electromagnetic (EM) spectrum is the range of all possible frequencies of electromagnetic radiation.
    • The electromagnetic (EM) spectrum is the range of all possible frequencies of electromagnetic radiation .
    • Generally, electromagnetic radiation is classified by wavelength into radio waves, microwaves, terahertz (or sub-millimeter) radiation, infrared, the visible region humans perceive as light, ultraviolet, X-rays, and gamma rays.
    • The behavior of EM radiation depends on its wavelength.
    • Also, radiation from various parts of the spectrum has many other uses in communications and manufacturing.

  • Therapeutic Uses of Radiation

    • Radiation therapy uses ionizing radiation to treat conditions such as hyperthyroidism, cancer, and blood disorders.
    • Radiation therapy involves the application of ionizing radiation to treat conditions such as hyperthyroidism, thyroid cancer, and blood disorders.
    • Ionizing radiation works by damaging the DNA of exposed tissue, leading to cellular death.
    • Radiation therapy is in itself painless.
    • Radiation therapy of the pelvis.

  • Medical Imaging and Diagnostics

    • Radiation therapy uses ionizing radiation to treat conditions such as hyperthyroidism, cancer, and blood disorders.
    • Radiation therapy involves the application of ionizing radiation to treat conditions such as hyperthyroidism, thyroid cancer, and blood disorders.
    • Ionizing radiation works by damaging the DNA of exposed tissue, leading to cellular death.
    • Radiation therapy is in itself painless.
    • Radiation therapy of the pelvis.

  • Planck's Quantum Hypothesis and Black Body Radiation

    • A black body emits radiation called black body radiation.
    • Planck described the radiation by assuming that radiation was emitted in quanta.
    • A black body in thermal equilibrium (i.e. at a constant temperature) emits electromagnetic radiation called black body radiation.
    • Max Planck, in 1901, accurately described the radiation by assuming that electromagnetic radiation was emitted in discrete packets (or quanta).
    • Contrary to the common belief that electromagnetic radiation can take continuous values of energy, Planck introduced a radical concept that electromagnetic radiation was emitted in discrete packets (or quanta) of energy.

  • Radiation

    • In these examples, heat is transferred by radiation.
    • There is a clever relation between the temperature of an ideal radiator and the wavelength at which it emits the most radiation.
    • The rate of heat transfer by emitted radiation is determined by the Stefan-Boltzmann law of radiation:
    • If you knock apart the coals of a fire, there is a noticeable increase in radiation due to an increase in radiating surface area.
    • A black object is a good absorber and a good radiator, while a white (or silver) object is a poor absorber and a poor radiator.

  • Biological Effects of Radiation

    • Ionizing radiation is generally harmful, even potentially lethal, to living organisms.
    • Ionizing radiation is generally harmful, even potentially lethal, to living organisms.
    • Although radiation was discovered in the late 19th century, the dangers of radioactivity and of radiation were not immediately recognized.
    • Other conditions, such as radiation burns, acute radiation syndrome, chronic radiation syndrome, and radiation-induced thyroiditis are deterministic, meaning they reliably occur above a threshold dose and their severity increases with dose.
    • Two pathways of exposure to ionizing radiation exist.

  • Radiation Detection

    • A radiation detector is a device used to detect, track, or identify high-energy particles.
    • A radiation detector is a device used to detect, track, or identify high-energy particles, such as those produced by nuclear decay, cosmic radiation, and reactions in a particle accelerator.
    • Modern detectors are also used as calorimeters to measure the energy of detected radiation.
    • Gaseous ionization detectors use the ionizing effect of radiation upon gas-filled sensors.
    • Scintillators are used by the American government, particularly Homeland Security, as radiation detectors.

  • A Physical Aside: Multipole Radiation

    • It is possible to calculate the radiation field to higher order in $L/(c\tau)$.This is necessary if the dipole moment vanishes, for example.
    • where $k\equiv\omega/c$$n=0$ gives the dipole radiation, $n=1$ gives the quadrupole radiation and so on.

  • A Physical Aside: Intensity and Flux

    • Blackbody radiation is a radiation field that is in thermal equilibrium with itself.
    • In general we will find it convenient to think about radiation that is in equilibrium with some material or its enclosure.
    • Using detailed balance between two enclosures in equilibrium with each other and the enclosed radiation we can quickly derive several important properties of blackbody radiation.
    • The intensity ($I_\nu$) of blackbody radiation does not depend on the shape, size or contents of the enclosure.