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__NOTOC__ The terahertz gap is an engineering term for a band of frequencies in the terahertz region of the electromagnetic spectrum between radio waves and infrared light for which practical technologies for generating and detecting the radiation do not exist. It is defined as 0.1 to 10 THz (wavelengths of 3 mm to 30 µm). Currently, at frequencies within this range, useful power generation and receiver technologies are inefficient and impractical. Mass production of devices in this range and operation at room temperature are mostly infeasible. Hence, a gap exists between mature microwave technologies in the lower frequencies of the electromagnetic spectrum and the well developed optical technologies in infrared wavelengths and higher frequencies of the electromagnetic spectrum. Research that attempts to resolve this issue has been conducted over recent decades .〔 〕〔 〕〔 〕〔 〕〔 〕 ==Research== Ongoing investigation has resulted in improved emitters (sources) and detectors, and research in this area has intensified. However, drawbacks remain that include the substantial size of emitters, incompatible frequency ranges, and undesirable operating temperatures, as well as component, device, and detector requirements that are somewhere between solid state electronics and photonic technologies.〔 〕〔 〕〔 〕 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「terahertz gap」の詳細全文を読む スポンサード リンク
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