Terahertz emission from a large-area GaInAsN emitter

Peter, Falk; Winnerl, Stephan; Schneider, Harald; Helm, Manfred; Köhler, Klaus
September 2008
Applied Physics Letters;9/8/2008, Vol. 93 Issue 10, p101102
Academic Journal
A large-area interdigitated terahertz emitter based on molecular-beam epitaxy grown GaInAsN with an additional AlGaAs heterostructure is investigated as a terahertz source for excitation wavelengths between 1.1 and 1.5 μm. The optical and electrical properties of the emitter material exhibit absorption up to a wavelength of 1.5 μm and have a resistivity of 550 kΩ cm. Terahertz waves were detected by electro-optical sampling with a bandwidth exceeding 2 THz. Best performance is found for excitation wavelengths below 1.35 μm. Furthermore the emission properties for several excitation powers are investigated, showing a linear increase in terahertz emission.


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