Multi-layered topological insulator for THz detection
Kotaro MakinoS. KuromiyaKeisuke TakanoKosaku KatoMakoto NakajimaHitoshi IidaMoto KinoshitaYuta SaitoJunji TominagaTakashi Nakano
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Abstract:
We report THz detection with GeTe/Sb2Te3 multi-layered topological insulator. Photoconductive-type detector device was fabricated and THz-induced change of the current was observed when the bias voltage was applied and THz pulse was irradiated.Keywords:
Topological insulator
Photoconductivity
Biasing
Terahertz technology is a very promising technology. Terahertz source,terahertz detector and terahertz application are three key-points in terahertz technology field. The applied demand in terahertz spectroscopy,terahertz imaging,and terahertz communication are analyzed; the mechanism and characteristics of terahertz source as well as the main current classification and the common terahertz detectors are also introduced. Based on the developing progress of infrared detectors,developing trends and the probably technique difficulties of terahertz detectors in the future are also analyzed from the view of photonics.
Terahertz gap
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The terahertz high rate wireless communication system plays an important role in terahertz technology. There are two typical occasions for terahertz communication to be applied, the satellite communication and short-range communication on the ground. In this paper, the link budget calculations of terahertz communication in different scenes have been finished, which prove the terahertz wave source is the key of terahertz system. Among the terahertz source devices, mixer and resonant tunneling oscillator are more appropriate for terahertz communication in space and indoors. The simulation and analysis of sub-harmonic mixer and resonant tunneling oscillator characteristics is discussed according to different application scenes. At last, the prospect of terahertz communication is given.
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전기적인 장치를 기반으로 한 테라헤르츠 송신기(Terahertz Transmitter: Tx)를 이용하여 0.34 THz의 전자기파를 발생시키는 소형 CW sub-THz 이미징 시스템을 제시하였다. Tx에 의해 발생된 0.34 THz의 전자기파는 테라 헤르츠 수신기(Terahertz Receiver: Rx)를 이용하여 샘플의 진폭(magnitude)과 위상(phase) 정보를 각각 측정하였다. 이 논문에서는 보다 좋은 이미지 해상도를 얻기 위하여 데이터 수집 시 이미지의 분해능(resolution)에 영향을 미치는 주사 스테이지(scanning stage)의 시간 지연과 스텝 거리를 변수로 두어 다양한 샘플들을 주사하여 그 결과를 측정, 비교하였다. 또한 플라스틱, 종이, 나무 등 다양한 샘플들의 이미징 측정을 통해 테라헤르츠 파의 응용 가능성을 확인하였다. This paper presented compact CW sub-THz imaging system using the terahertz transmitter(Tx) that generates 0.34 THz electromagnetic wave based on electronic device. Using 0.34 THz electromagnetic wave generated by Tx, we measured transmitting terahertz wave magnitude and phase information respectively with terahertz receiver(Rx) based on sub harmonic mixer. This paper measured and compared images of several samples to obtain better imaging results by changing time delay and step distance of scanning stage which affect image resolution. Also, through the imaging measurement of various samples, we were able to assure possibility of application of terahertz wave.
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The principle of detecting the vacuum degree of terahertz wave is discussed. The imaging principle, imaging characteristics, imaging speed, and price of pulsed terahertz and continuous wave terahertz are compared and analyzed. The conclusion shows that the pulse terahertz frequency is higher in the practicality of vacuum detection, but it is expensive, bulky and inconvenient to operate in the field. Continuous wave terahertz imaging has high frequency resolution, low price, short imaging time and practical more sexual.
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Terahertz electromagnetic waves have applications in fields as diverse as biological imaging, materials science, and astrophysics. However, the development of compact, high-power, broadly tunable terahertz sources is challenging. The authors propose a frequency mixer that uses a free-electron beam to drive two cascaded gratings, producing multicolor coherent terahertz radiation via the superradiant Smith-Purcell effect. This device can simultaneously generate several terahertz emissions of high average power, and its frequency can be tuned from 0.8 to 1.8 THz, offering a compact, efficient terahertz source.
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Development of millimeter and sub-millimeter wavelengths technologies is of great interest lately, especially for application in terahertz imaging due to bringing high resolution. In our paper we consider a tomography approach for obtaining 3-D imaging in frequency range from 100 GHz up to 325 GHz. We applied the method which we developed earlier for low frequency sub-surface tomography, for extremely high frequencies. The considered method may be used for 3D imaging in non-destructive testing. In the paper we present a theoretical model, experimental method and the comparison of results obtained at terahertz and sub-terahertz frequencies.
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Terahertz technology is unexplored frontier which bridges photonics and electronics. Following the description of the principles and characteristics of terahertz radiation, the generation and the detection technique of terahertz radiation are introduced. On the basis of the current development of terahertz sources and detectors, the application of terahertz technology, such as terahertz spectra, terahertz imaging, and terahertz communication is presented. The breakthrough of terahertz devices will prosper the economic development and solid the national security in the near future though the recent status of terahertz technology still faces great technical challenges.
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