Engineering the Losses and Beam Divergence in Arrays of Patch Antenna Microcavities for Terahertz Sources
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We perform a comprehensive study on the emission from finite arrays of patch antenna microcavities designed for the terahertz range by using a finite element method. The emission properties including quality factors, far-field pattern, and photon extraction efficiency are investigated for etched and non-etched structures as a function of the number of resonators, the dielectric layer thickness, and period of the array. In addition, the simulations are achieved for lossy and perfect metals and dielectric layers, allowing to extract the radiative and non-radiative contributions to the total quality factors of the arrays. Our study shows that this structure can be optimized to obtain low beam divergence (FWHM <10°) and photon extraction efficiencies >50% while keeping a strongly localized mode. These results show that the use of these microcavities would lead to efficient terahertz emitters with a low divergence vertical emission and engineered losses.
KeywordsTerahertz sources Patch antenna Microcavity Arrays Finite element method
This work was supported by JSPS Kakenhi grant number JP17K14126.
- 5.F. Wang, I. Kundu, L. Chen, L. Li, E. H. Linfield, A. G. Davies, S. Moumdji, R. Collombelli, J. Mangeney, J. Tignon and S.S. Dhillon, Engineered far-fields of metal-metal terahertz quantum cascade lasers with integrated planar horn structures, Optics Express 24, 2174–2182 (2016)CrossRefGoogle Scholar
- 15.E. D. Palik, Handbook of Optical Constants of Solids, Elsevier (1997)Google Scholar
- 18.R. Mailloux, Phased Array Antenna Handbook, Norwood: Artech House (2005)Google Scholar
- 20.Y. Xie, Y. Li, J. Wang, N. Yang, W. Chu, S. Duan, Power amplification and coherent combination techniques for terahertz quantum cascade lasers, Quantum cascade lasers, Chap.5, Intech (2017)Google Scholar