A convenient method to achieve a broadband multi-peak coherent THz source

Terahertz (THz) generation using implanted InGaAs photomixers and multi-wavelength quantum dot lasers were reported by Liu’s research group fromShanghaiJiaoTongUniversity.

In the Vol. 4 (No.1, 2012) of the journal NML (NANO-MICRO LETTERS),the research group use proton implanted InGaAs THz photomixers and 1.55 μm multi-mode InGaAs/InGaAsP quantum dot (QD) lasers to achieve THz generation. Proton implantation is used into an epitaxial layer of lattice matched InGaAs grown on InP for shortening photomixer carrier lifetime.The QD laser they developed works in the telecom wavelength region of 1.55 μm.A THz radiation measurement system is established. With this method a broadband THz radiation comb with constant frequency spacing and high degree of coherence may be generated. This approach may result in broadband multi-peak coherent THz source suitable for applications such as sensing and spectroscopy.

Convenient sources of terahertz (THz) radiation have many potential application regions, for example in sensing, aerospace, medical and biological sciences, information and communication. They investigate the approach of using ionimplanted InGaAs photomixer and muti-wavelength QD laser, finding that the higher implanted device shows a higher frequency capability.

You can find out more about their work by reading the article in Nano-Micro Letters.

Y.Hou, J.R.Liu, M.Buchanan, A.J.Spring Thorpe, P.J.Poole, H.C.Liu, Ke Wu, Sjoerd Roorda and X.P.Zhang,“Terahertz Generation Using Implanted InGaAs Photomixers and Multi-wavelength Quantum Dot Laser”, Nano-Micro Lett. 4 (1), 10-13 (2012). doi:10.3786/nml.v4i1.p10-13

Keywords: Proton implanted InGaAs; Trahertz; Photomixer; Multi-wavelength quantum dot laser; Fourier transform infrared spectroscopy

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  1. I couldn’t resist commenting. Very well written!

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