[15a-2E-1~12] 4.7 Terahertz Photonics

▲ [15a-2E-4] Optimal 1D Microcavity Structure for THz Emission from Optically Pumped GaP Layer: Electromagnetic Analysis by the Method of Single Expression

Hovik V. Baghdasaryan¹, Tamara M. Knyazyan¹, Tamara T. Hovhannisyan¹, Arsen A. Hakhoumian², 〇(P)Marian Marciniak^3,4 (1.Nat. Polytech. Univ. of Armenia, 2.Inst. of Radiophys.& Electron. NAS, 3.Nat. Inst. of Telecom., 4.Kielce Univ. of Techn.)

キーワード：THz emission,optically pumped GaP,method of single expression

Fabry – Perot type micro-resonators with DBR mirrors of SiO₂/Air bilayers are analysed numerically via the method of single expression (MSE). We analyse THz wave emission technique using non-linear optical effect in semiconductors known as THz wave rectification. The obtained distributions of electric and magnetic fields and Poynting vector within the considered structures provide the clear explanation of physics of efficient THz emission from optimal 1D microcavity. Resonant emission takes place at frequencies coinciding with the resonant transparency of microcavity with GaP as a spacer. We have shown that emission intensity from “DBR – GaP layer – DBR” structure strongly depends not only on the number of layers in DBRs but also on the outermost layers’ permittivity. For efficient emission of THz waves from a GaP layer adjacent to semiconductor DBRs’ layers should be of low dielectric permittivity. Further enhancement of THz emission from this type of multilayer structure is possible by an increase of micro-resonator’s Q – factor, which requires an increase of the number of bilayers in DBRs.