@inproceedings{ea086c1c5be84db0bcd4f0e7a316fe51,
title = "Design of metalens with local phase control for high power THz emission",
abstract = "Spintronic terahertz emitters (STEs) are novel sources capable of emitting radiation in a wide THz frequency band. They, however, suffer from low efficiency and emitted power. To increase their power, we have proposed in this work the possibility of integrating a focusing metasurface (metalens) directly on top of the STE substrate backside. The feasibility of this metasurface is achieved with the generalized Snell{\textquoteright}s law and the non-resonant propagation phase mechanism. The proposed basic unit cell of the metasurface is a high aspect ratio cylinder made of poly(methyl methacrylate) (PMMA) resist, which is producible simply by the initial steps of the LiGA (lithography, electroplating, molding) process. These structures are designed and optimized using simulations in the commercial software CST Microwave Studio with the frequency and time domain solvers. Simulation results are compared to those obtained with analytical relations from diffraction theory, which allows easier calculation for large-scale problems.",
keywords = "CST Studio, Spintronic terahertz emitter, metalens, numerical simulation, optimization, propagation phase",
author = "Jakub Tob{\v e}rn{\'y} and Tom{\'a}{\v s} Kohut and Henri Jaffres and Fay{\c c}al Bouamrane and Kamil Postava",
note = "Publisher Copyright: {\textcopyright} 2025 SPIE.; 23rd Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics ; Conference date: 02-09-2024 Through 06-09-2024",
year = "2025",
month = jan,
day = "1",
doi = "10.1117/12.3056702",
language = "English",
series = "Proceedings of SPIE - The International Society for Optical Engineering",
publisher = "SPIE",
editor = "Dusan Pudis and Daniel Jandura and Ivana Lettrichova",
booktitle = "23rd Slovak-Czech-Polish Optical Conference on Wave and Quantum Aspects of Contemporary Optics",
}