Photoconductive THz Detector Based on New Functional Layers in Multi-Layer Heterostructures

Characteristics of photoconductive antennas (PCAs) based on InGaAs/InAs/InAlAs superlattice heterostructures exhibiting different types of elastic strain in the layers are compared experimentally. THz signals, noise characteristics, and signal-to-noise ratios of the PCA-detectors were compared by me...

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Bibliographic Details
Published in:Optics and spectroscopy 2021-08, Vol.129 (8), p.851-856
Main Authors: Yachmenev, A. E., Lavrukhin, D. V., Khabibullin, R. A., Goncharov, Yu. G., Spector, I. E., Zaytsev, K. I., Solov’ev, V. A., Ivanov, S. V., Ponomarev, D. S.
Format: Article
Language:English
Subjects:
Compressive properties
Crystal lattices
Detectors
Electrons
Heterostructures
Lasers
Lattice matching
Multilayers
Optical Devices
Optics
Photonics
Physics
Physics and Astronomy
Superlattices
Tensile strain
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Summary:Characteristics of photoconductive antennas (PCAs) based on InGaAs/InAs/InAlAs superlattice heterostructures exhibiting different types of elastic strain in the layers are compared experimentally. THz signals, noise characteristics, and signal-to-noise ratios of the PCA-detectors were compared by means of a laboratory pulsed time-domain THz spectrometer at different levels of average optical-probe power. A larger detection bandwidth in entire range of probe power is demonstrated experimentally for PCA-detectors based on superlattice heterostructures exhibiting both compressive and tensile strain compared to lattice-matched superlattice heterostructures. It can thus be stated that modification of properties of superlattice heterostructures by introducing strain in the crystal lattice represents a universal and relatively efficient method of improving characteristics of PCAs based on such heterostructures, which allows using these PCAs for development of THz spectroscopy and imaging systems.
ISSN:0030-400X
1562-6911
DOI:10.1134/S0030400X21060187