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Large area InN terahertz emitters based on the lateral photo-Dember effect

: Wallauer, J.; Grumber, C.; Polyakov, V.; Iannucci, R.; Cimalla, V.; Ambacher, O.; Walther, M.


Applied Physics Letters 107 (2015), No.11, Art. 111102, 4 pp.
ISSN: 0003-6951 (Print)
ISSN: 1077-3118
ISSN: 1931-9401 (online)
Journal Article
Fraunhofer IAF ()
emission intensity; Indium Nitride; laser illumination; physical properties; micro structuring; Photo-Dember effect; Terahertz emitters; photogenerated charge carriers; simple metals

Large area terahertz emitters based on the lateral photo-Dember effect in InN (indium nitride) are presented. The formation of lateral photo-Dember currents is induced by laser-illumination through a microstructured metal cover processed onto the InN substrate, causing an asymmetry in the lateral photogenerated charge carrier distribution. Our design uses simple metal structures, which are produced by conventional two-dimensional micro-structuring techniques. Having favoring properties as a photo-Dember material InN is particularly well-suited as a substrate for our emitters. We demonstrate that the emission intensity of the emitters can be significantly influenced by the structure of the metal cover leaving room for improvement by optimizing the masking structures.