Reflective scanning imaging based on a fast terahertz photodetector
The fast detection of terahertz radiation is recognized as a key technology of terahertz imaging systems. We realize a terahertz imaging system employing a terahertz quantum-well photodetector (QWP) and a terahertz quantum cascade laser (QCL). The detector can rapidly detect the 4.3THz light generat...
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| Vydané v: | Optics communications Ročník 427; s. 170 - 174 |
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| Hlavní autori: | , , , , , , |
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| Jazyk: | English |
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Elsevier B.V
15.11.2018
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| ISSN: | 0030-4018, 1873-0310 |
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| Abstract | The fast detection of terahertz radiation is recognized as a key technology of terahertz imaging systems. We realize a terahertz imaging system employing a terahertz quantum-well photodetector (QWP) and a terahertz quantum cascade laser (QCL). The detector can rapidly detect the 4.3THz light generated from a pulsed electrically-pump terahertz QCL, which is used as the terahertz source of the imaging system. The object is placed on a rotary scanning platform to realize fast scanning. A practical detection method of the terahertz pulse signal is employed to extract the amplitude information from the terahertz signal and improve the signal-to-noise ratio (SNR) of the system. The electrical and optical performances of the fast terahertz QWP are characterized, and the results show that the terahertz QWP can completely meet the fast detection requirement of the terahertz imaging system. The terahertz images of some invisible objects are obtained with a high contrast within 5 s. The imaging system owns a resolution of 0.3 mm and a circular imaging region with a diameter of 100 mm. An image processing algorithm is applied in this system to solve the noise problem and improve the quality of the images. The imaging results indicate that terahertz QWP has a good application prospect in nondestructive inspection applications and the research of the fast physical or chemistry process. |
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| AbstractList | The fast detection of terahertz radiation is recognized as a key technology of terahertz imaging systems. We realize a terahertz imaging system employing a terahertz quantum-well photodetector (QWP) and a terahertz quantum cascade laser (QCL). The detector can rapidly detect the 4.3THz light generated from a pulsed electrically-pump terahertz QCL, which is used as the terahertz source of the imaging system. The object is placed on a rotary scanning platform to realize fast scanning. A practical detection method of the terahertz pulse signal is employed to extract the amplitude information from the terahertz signal and improve the signal-to-noise ratio (SNR) of the system. The electrical and optical performances of the fast terahertz QWP are characterized, and the results show that the terahertz QWP can completely meet the fast detection requirement of the terahertz imaging system. The terahertz images of some invisible objects are obtained with a high contrast within 5 s. The imaging system owns a resolution of 0.3 mm and a circular imaging region with a diameter of 100 mm. An image processing algorithm is applied in this system to solve the noise problem and improve the quality of the images. The imaging results indicate that terahertz QWP has a good application prospect in nondestructive inspection applications and the research of the fast physical or chemistry process. |
| Author | Wan, Wenjian Cao, Juncheng Qiu, Fucheng Wang, Chang Tan, Zhiyong Li, Mengqi Fu, Zhanglong |
| Author_xml | – sequence: 1 givenname: Fucheng surname: Qiu fullname: Qiu, Fucheng – sequence: 2 givenname: Zhiyong surname: Tan fullname: Tan, Zhiyong email: zytan@mail.sim.ac.cn – sequence: 3 givenname: Zhanglong surname: Fu fullname: Fu, Zhanglong – sequence: 4 givenname: Wenjian surname: Wan fullname: Wan, Wenjian – sequence: 5 givenname: Mengqi surname: Li fullname: Li, Mengqi – sequence: 6 givenname: Chang surname: Wang fullname: Wang, Chang email: cwang@mail.sim.ac.cn – sequence: 7 givenname: Juncheng surname: Cao fullname: Cao, Juncheng email: jccao@mail.sim.ac.cn |
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| Cites_doi | 10.1002/jps.20225 10.3390/s17102209 10.1063/1.108115 10.1063/1.4918983 10.1063/1.117808 10.1109/TTHZ.2013.2273226 10.1364/OL.39.004863 10.1088/0022-3727/47/37/374008 10.1063/1.4793424 10.1364/OE.24.013839 10.1049/el.2013.4079 10.1587/elex.8.1127 10.1016/0020-0891(74)90041-4 10.1631/FITEE.1601719 10.1364/OE.20.019200 10.1007/s10762-012-9885-y 10.1117/12.946013 10.1109/JSTQE.2016.2608618 10.1364/OE.19.016401 10.1109/JSTQE.2012.2201136 10.1364/AO.47.000072 10.1038/417156a 10.1038/s41598-017-03787-6 10.1021/acsphotonics.6b00405 10.1063/1.4926602 |
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