doi:

DOI: 10.3724/SP.J.1249.2019.02147

Journal of Shenzhen University Science and Engineering (深圳大学学报理工版) 2019/36:2 PP.147-151

Terahertz frequency up-conversion imaging devices


Abstract:
Terahertz (THz) imaging device is one of the key technologies in THz technology applications. A THz frequency up-conversion imaging device made of THz quantum-well photodetectors and light-emitting diode (THz QWP-LEDs) is fabricated by stacking and growing THz QWPs and near-infrared LEDs with molecular beam epitaxy technology. The 45° facet coupler has a peak response of 0.22 A/W at the peak detection frequency of 5.2 THz and a noise equivalent power of 5.2×1012 W/Hz0.5. And the device also has the ability to image the spot of the terahertz quantum cascade laser (THz QCL) clearly. The developed metal grating coupler can achieve normal incidence imaging, effectively reduce the image distortion and is conducive to the preparation of large area devices. The working principle, fabrication method, basic performance and imaging performance of the devices are introduced in detail. The current-voltage characteristics, imaging quality and imaging distortion of the device are discussed. The devices have no need of cryogenic reading integrated circuits and flip-chip package based on pixel-free imaging technology. Therefore, the development of these devices can provide a simple way for high-performance THz imaging.

Key words:semiconductor devices and technology,terahertz,quantum-well,detector,frequency up-conversion,imaging

ReleaseDate:2019-12-02 09:24:37



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