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Submillimeter waves

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Submillimeter waves

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Scientific Overview. Astronomical observations at submillimeter wavelengths, between 40 μm and 1 mm, study astro-physical sources and problems which differ from and complement those accessible at other wavelengths. Although a few nonthermal sources are known, most of the radiation observed in this spectral band from astronomical sources outside of the solar system comes from extended clouds of gas and dust with temperatures in the range 10-500 K and densities between 10 and 10⁶ atoms cm⁻³. The submillimeter radiation consists of both continuous emission from the sub-micron sized dust particles, which make up ∼ 1% of the total mass, and line emission from atomic and molecular species in the gas. The energy radiated at submillimeter wavelengths is generally supplied to such a cloud in the form of ultraviolet, optical, or near infrared radiation from stars or other luminous objects which is absorbed by the dust and goes into heating the dust and gas. Since only a small amount of dust is required to convert ultraviolet and optical radiation into submillimeter radiation, there are many astronomical sources from which most or all of the observed energy lies in this spectral region, although the objects which heat the dust and gas differ from one submillimeter source to another. Thus intense submillimeter radiation is seen from the center of our Galaxy [1] and from diffusely distributed matter within the galactic plane [2], where the heating is probably due to normal stars; from the nuclei of several other galaxies [3], where exotic heating sources may be important; and from shells of dust and gas which are expelled from and heated by evolving stars [4].

Submillimeter waves --- Microwaves

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Submillimeter waves --- Optoelectronic devices --- Millimeter wave devices

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Terahertz physics covers one of the least explored but richest regions of the electromagnetic spectrum. Designed for independent learning, this is the first book to open up this exciting new field to students of science and engineering. Written in a clear and consistent style, the textbook focuses on an understanding of fundamental physical principles at terahertz frequencies and their applications. Part I outlines the foundations of terahertz science, starting with the mathematical representation of oscillations before exploring terahertz-frequency light, terahertz phenomena in matter and the terahertz interactions between light and matter. Part II covers components of terahertz technology, from sources of terahertz frequency radiation, through the manipulation of the radiation, to its detection. Part III deals with applications, including time-domain spectroscopy. Highlighting modern developments and concepts, the book is ideal for self-study. It features precise definitions, clear explanations, instructive illustrations, fully worked examples, numerous exercises and a comprehensive glossary.

Submillimeter waves. --- Electromagnetic waves. --- Physics. --- Terahertz spectroscopy.