Large area photoconductive terahertz emitter for 1.55 μm excitation based on an InGaAs heterostructure

We present scalable large area terahertz (THz) emitters based on a nanoscale multilayer InGaAs/InAlAs heterostructure and a microstructured electrode pattern. The emitters are designed for pump lasers working at the telecommunication wavelength of 1.55 μm. Electric THz fields of more than 2.5 V cm−1...

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Bibliographic Details
Published in:Nanotechnology 2013-05, Vol.24 (21), p.214007-214007
Main Authors: Mittendorff, Martin, Xu, Ming, Dietz, Roman J B, Künzel, Harald, Sartorius, Bernd, Schneider, Harald, Helm, Manfred, Winnerl, Stephan
Format: Article
Language:English
Subjects:
Arsenicals - chemistry
Arsenicals - radiation effects
Electric Conductivity
Electric power generation
Emittance
Equipment Design
Equipment Failure Analysis
Gallium - chemistry
Gallium - radiation effects
Heterostructures
Indium - chemistry
Indium - radiation effects
Indium gallium arsenides
Lasers
Lighting - instrumentation
Materials Testing
Nanoparticles - chemistry
Nanoparticles - radiation effects
Nanoparticles - ultrastructure
Nanostructure
Nanotechnology - instrumentation
Pumps
Saturation
Surface Properties
Terahertz Radiation
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Summary:We present scalable large area terahertz (THz) emitters based on a nanoscale multilayer InGaAs/InAlAs heterostructure and a microstructured electrode pattern. The emitters are designed for pump lasers working at the telecommunication wavelength of 1.55 μm. Electric THz fields of more than 2.5 V cm−1 are reached with moderate pump powers of 80 mW, the corresponding spectrum extends up to 3 THz. The saturation characteristics have been investigated for different pump laser spot sizes. For small pump powers of less than 50 mW the emitted THz field is nearly independent of the spot size, for higher pump powers and small spot sizes a clear saturation of the generated THz pulse can be observed. Hence the use of scalable emitters is especially promising for high power fibre laser systems. The spectral content of the generated radiation is nearly independent of the parameters spot size, pump power, and bias voltage, which allows for stable operation in spectroscopic applications.
ISSN:0957-4484
1361-6528
DOI:10.1088/0957-4484/24/21/214007