Abstract
A fiber-assembled CW THz System operating at 1.5 microm is presented. High speed telecom photodiodes integrated with planar THz antennas serve as THz emitters with power up to 10 microW. Photoconductive antennas based on LT InGaAs/InAlAs multi-layer structures allow coherent detection. The system operates in a wide frequency range of 0.1 -1.6 THz.
Highlights
Terahertz spectroscopy promises attractive applications in various fields such as security, medicine, science, and non-destructive material testing [1]
A fiber-assembled continuous wave (CW) THz System operating at 1.5 μm is presented
This paper focuses on continuous wave (CW) THz systems and their improvements by using telecom technologies
Summary
Terahertz spectroscopy promises attractive applications in various fields such as security, medicine, science, and non-destructive material testing [1]. NTT in Japan developed the Uni-Traveling-Carrier (UTC) photodiode structure, where only the fast electrons - not the slow holes - limit the device speed [5] They were able to demonstrate THz emission of about 2 μW at 1 THz. By optimizing the UTC concept and combining it with resonant antennas, other institutions have published THz emission powers of more than 100 μW at 400 GHz [6]. For achieving sufficient absorption a sequence of 100 periods of this layer structure has been grown (Fig. 3a) The performance of this material for operation up to 3 THz has already been demonstrated in time domain spectrometers with strip line emitters and dipole receivers [8].
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