[25p-D315-1~18] 3.9 Terahertz technologies

▲ [25p-D315-5] Analysis of operating characteristics of photonic nanostructured surface emitting THz-QCL

〇Mingxi Chen^1,2, Tsung-Tse Lin¹, Chiko Otani^1,2, Hideki Hirayama¹ (1.RAP, 2.Tohoku Univ.)

Keywords:surface emitting THz QCL, 3D CWT, photonic crystal

The prospect of terahertz-band quantum cascade laser (THz QCL) on being compact and high-emission-power THz source has been proved in recent decades. Although watt-level emission has been achieved by edge-emitting THz QCL with Fabry–Pérot cavity, its energy conversion efficiency is still stay at a low level, besides, the far-field pattern is not good enough for real application too. We proposed to design and fabricate surface emitting QCL (SEQCL) with distribute feedback structure, which according to reports, both the luminous efficiency and far field pattern will be significantly improved. For designing the structure, 3-dimensional coupled wave theory (3D CWT) was applied as the simulation method. Althogh it is still an initial attempt, the results show potential of SE THz QCL as a possible improvement over the conversional ones.