cw-THz Receivers based on Rhodium-doped InGaAs with 125 dB Peak Dynamic Range

被引：0
|
作者：
Deumer, Milan [1 ]
Breuer, Steffen [1 ]
Keyvaninia, Shahram [1 ]
Dohms, Alexander [1 ]
Nellen, Simon [1 ]
Nguyen, Chris [1 ]
Liebermeister, Lars [1 ]
Schell, Martin [1 ,2 ]
Kohlhaas, Robert B. [1 ]
机构：
[1] Heinrich Hertz Inst Nachrichtentech Berlin GmbH, Fraunhofer Inst Telecommun, Einsteinufer 37, D-10587 Berlin, Germany
[2] Tech Univ Berlin, Inst Solid State Phys, Hardenbergstr 36, D-10623 Berlin, Germany
来源：
TERAHERTZ, RF, MILLIMETER, AND SUBMILLIMETER-WAVE TECHNOLOGY AND APPLICATIONS XVII | 2024年 / 12885卷
关键词：
Continuous wave; Photoconductive antenna; Terahertz; Terahertz receiver; Terahertz spectroscopy; Rhodium doping; 1550 nm excitation; TERAHERTZ; SYSTEM;
D O I：
10.1117/12.3003109
中图分类号：
TM [电工技术]; TN [电子技术、通信技术];
学科分类号：
0808 ; 0809 ;
摘要：
We report on novel continuous wave (cw) photoconductive terahertz (THz) receivers based on rhodium (Rh) doped indium gallium arsenide grown by molecular beam epitaxy. The Rh-doped material exhibits outstanding charge carrier mobility up to 1800 cm(2)/Vs while maintaining ultrashort carrier lifetimes between 0.26 and 1.5 ps. The photoconductive antennas (PCAs) made from this material exhibit a THz responsivity significantly improved by a factor of 20 to 100, which overcompensates their slightly higher noise levels. In a homodyne coherent THz spectroscopy setup, these novel receivers enable us to measure THz spectra with a record peak dynamic range up to 125 dB and a spectral bandwidth of 4.5 THz. This is an improvement of 13 dB over the previous record with InGaAs:Fe-based PCAs and leads to improved accuracy and measurement speed in cw-THz spectroscopy.
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页数：5
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