SKM 2023 – wissenschaftliches Programm
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HL: Fachverband Halbleiterphysik
HL 17: THz and MIR physics in semiconductors
HL 17.3: Vortrag
Dienstag, 28. März 2023, 10:00–10:15, JAN 0027
Ultrafast Terahertz-Wave Emission from Photoconductive Antenna Arrays and Spin Emitters — •Osama Hatem1, Thales V. A. G. de Oliveira2, Susanne C. Kehr1, and Lukas M. Eng1,3 — 1Institute of Applied Physics, Technische Universität Dresden, 01062 Dresden, Germany — 2Institute of Ion Beam Physics and Materials Research, Helmholtz-Zentrum Dresden-Rossendorf, 01328 Dresden, Germany — 3ct.qmat: Würzburg-Dresden Cluster of Excellence - EXC 2147, Technische Universität Dresden, Dresden, Germany
For long time, terahertz (THz) radiation (0.1 THz to 10 THz) was little used in science and technology owing to the lack of efficient terahertz sources and detectors. However, recent advances in laser technology and semiconductors industry sparked the interest in exploring this spectral range further. Recently, THz radiation has shown great importance in a wide range of potential applications including THz time-domain spectroscopy and imaging [1-2].
In this work, we report the emission of THz waves from GaAs photoconductive antenna arrays and Fe/Pt spin emitters upon excitation with femtosecond laser pulses at 800 nm. THz waves with bandwidth of 0.1- 5 THz and SNR > 500 below 1 THz were measured. Moreover, detection of THz waves by electro-optic sampling was investigated using ZnTe, GaP, and GaSe crystals of varying thickness. The results are of great significance for THz nanoscopy and imaging applications.
[1] M. Schall et al., Int. J. Infrared Millim. Waves 20, 595-604 (1999). [2] O. Hatem, J. Opt. Soc. Am. B 36, 1144-1149 (2019).