Thursday, February 12, 2015

Abstract-Terahertz reflection and emission associated with nonequilibrium surface plasmon polaritons in n-GaN

G A Melentyev1, V A Shalygin1, M D Moldavskaya1, V Yu Panevin1, L E Vorobjev1, D A Firsov1, H Nykänen2, L Riuttanen2, O Svensk2 and S Suihkonen2
1 Department of Physics of Semiconductors & Nanoelectronics, St. Petersburg Polytechnic University, Polytechnicheskaya 29, St. Petersburg 195251, Russia
2 School of Electrical Engineering, Aalto University, Otakaari 1, Espoo 02150, Finland 

Surface plasmon polaritons are investigated in heavily doped n-GaN epitaxial layers. The grating etched on the surface of the epitaxial layer is used to convert photons into the surface plasmon polaritons and vice versa. The spectral study of reflection demonstrates the possibility of nonequilibrium surface plasmon polaritons excitation due to terahertz radiation scattering on the grating. Terahertz electroluminescence is investigated under lateral electric field. The luminescence spectrum demonstrates a significant contribution of nonequilibrium surface plasmon polariton scattering to terahertz radiation emission.

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