Technology, Capabilities, and Performance of Low Power Terahertz Sources

Chattopadhyay, Goutam

doi:10.1109/tthz.2011.2159561

Cited by 203 publications

(94 citation statements)

References 186 publications

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“…Компактные полупроводниковые источники те-рагерцевого излучения маломощны (мощность из-лучения менее 10 Вт) и в большинстве своем требуют охлаждения [28]. Мощными источника-ми терагерцевого излучения являются гиротроны.…”

Section: активные элементы терагерцевого диапазонаunclassified

Prospects of Terahertz Frequencies Application

Ermolaev¹,

Talanov²,

Romanyuk³

2017

Rocket-Space Device Engineering and Information Systems

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Аннотация. Рассматривается возможный облик космической систем для работы в терагерцевом диапазоне частот (0,1-10 ТГц). Приводится конструкция и выбор антенн, чувствительных элементов и излучателей, перспективных для применения в кос-мической связи на терагерцевых частотах. В качестве приемной антенны взят массив (квадрат со стороной 1 м) из рупорных антенн с входным диаметром 1 см с быстрым твердотельным детектором, а в качестве передающей антенны принята па-раболическая антенна с диаметром 10 см. Рассчитывается необходимая мощность передатчика для дальностей связи 1000, 4000, 20 000 и 40 000 км. Проводится оценка затухания сигнала в атмосфере за счет влаги, которая является основным ис-точником поглощения терагерцевого излучения. Данное затухание составляет величину порядка 20 дБ. Однако выбранная конструкция антенн в терагерцевом диапазоне частот позволяет компенсировать сильное затухание как атмосферы, так и сво-бодного пространства. Также одним из преимуществ терагерцевого диапазона станет возможность создания узких диаграмм направленности излучения, что повышает эффективность использования спектра. Для космической связи борт-борт мощности современных источников терагерцевого диапазона достаточно. Космическая связь земля-борт возможна с низкоорбитальными космическими аппаратам, а для высокоорбитальных космических аппаратов можно использовать импульсный режим передачи данных. Abstract. The article considers the possible concept of space systems capable of operating in the terahertz frequency range (0,1-10 THz). The design and selection of antennas, sensors and emitters are revealed for applications in space communications at terahertz frequencies. An array (a square of 1 m side) of horn antennas with an output diameter of 1 cm and a fast solid-state detector was considered as the receiving antenna, and a parabolic antenna with a diameter of 10 cm was taken as the transmitting antenna. The required transmitter power for the communication ranges of 1000, 4000, 20 000 and 40 000 km has been calculated. An atmospheric attenuation of the signal due to the moisture, which is the main source of absorption of the terahertz radiation, is evaluated. This attenuation is about 20 dB. However, the selected design of the terahertz frequency range antennas can compensate for strong attenuation both in the atmosphere and in empty space. Moreover, one of the benefits of the terahertz frequency range is an ability to create a narrow radiation pattern that increases the efficiency of spectrum application. The article shows that the power of modern sources of terahertz is enough for spacecraft-to-spacecraft communication. Earth-to-spacecraft communication is possible with low-orbit spacecraft; for high-orbit spacecraft, the pulse mode of data transmission can be used.

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Section: активные элементы терагерцевого диапазонаunclassified

Prospects of Terahertz Frequencies Application

Ermolaev¹,

Talanov²,

Romanyuk³

2017

Rocket-Space Device Engineering and Information Systems

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“…The corresponding range of the wavelength for the Terahertz frequencies is 0.1-1 mm; thus, it is a denominated submillimeter wave [27]. The Terahertz technology is widely utilized in the field of astronomy, medical, and security, such as space-based remote sensing and medical diagnostic imaging [28][29][30][31], due to the submillimeter waves that are nonionizing, and it can penetrate a wide variety of nonconducting materials. Recently, high operating frequency requirements for microwave test instruments are increasing, such as recent commercial vector network analyzer which is capable of achieving 1.1 THz.…”

Section: Introductionmentioning

confidence: 99%

Introductory Chapter: RF/Microwave Applications

You¹

2018

Emerging Microwave Technologies in Industrial, Agricultural, Medical and Food Processing

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“…There are numerous THz imaging devices commercially available, but the deficiency of robust, compact and smartly developed imaging tools is still a major concern. The low power output of sources available in the THz spectrum brings some challenges in THz imaging and spectroscopy [9][10][11][12]. In these measurements, reflections from the samples such as biological tissues, liquids, and powdered specimens placed in a sample holder are needed to be minimized in order to enhance the signal received from the sample itself.…”

Section: Introductionmentioning

confidence: 99%

Terahertz Bandpass Frequency Selective Surfaces on Glass Substrates Using a Wet Micromachining Process

Ramzan

Khan

Bolat

et al. 2017

J Infrared Milli Terahz Waves

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This paper presents terahertz (THz) frequency selective surfaces (FSS) implemented on glass substrate using standard microfabrication techniques. These FSS structures are designed for frequencies around 0.8 THz. A fabrication process is proposed where a 100-μm-thick glass substrate is formed through the HF etching of a standard 500-μm-thick low cost glass wafer. Using this fabrication process, three separate robust designs consisting of single-layer FSS are investigated using high-frequency structural simulator (HFSS). Based on J Infrared Milli Terahz Waves (2017) the simulation results, the first design consists of a circular ring slot in a square metallic structure on top of a 100-μm-thick Pyrex glass substrate with 70% transmission bandwidth of approximately 0.07 THz, which remains nearly constant till 30°angle of incidence. The second design consists of a tripole structure on top of a 100-μm-thick Pyrex glass substrate with 65% transmission bandwidth of 0.035 THz, which remains nearly constant till 30°angle of incidence. The third structure consists of a triangular ring slot in a square metal on top of a 100-μm-thick Pyrex glass substrate with 70% transmission bandwidth of 0.051 THz, which remains nearly constant up to 20°angle of incidence. These designs show that the reflections from samples can be reduced compared to the conventional sample holders used in THz spectroscopy applications, by using single layer FSS structures manufactured through a relatively simple fabrication process. Practically, these structures are achieved on a fabricated 285-μm-thick glass substrate. Taking into account the losses and discrepancies in the substrate thickness, the measured results are in good agreement with the electromagnetic simulations.

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Technology, Capabilities, and Performance of Low Power Terahertz Sources

Cited by 203 publications

References 186 publications

Prospects of Terahertz Frequencies Application

Prospects of Terahertz Frequencies Application

Introductory Chapter: RF/Microwave Applications

Terahertz Bandpass Frequency Selective Surfaces on Glass Substrates Using a Wet Micromachining Process

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