2026-06-08T09:50:03Zhttps://docta.ucm.es/rest/oai/request

oai:docta.ucm.es:20.500.14352/923822025-03-18T13:34:50Zcom_20.500.14352_14col_20.500.14352_15

00925njm 22002777a 4500 dc Cuadrado Conde, Alexander author Fernández Rodríguez, Marianela author Sánchez Brea, Luis Miguel author García Lozano, Gonzalo author Mercant, Guillermo author Torquemada, Mº Carmen author Alda Serrano, Javier author Gonzalez, Luis M. author Belenguer Dávila, Tomás author 2023 Far infrared spectrometers have a prominent role to play in future space missions devoted to unveiling the obscure universe. Diffraction gratings are the heart of these instruments that, when operating in the range of a few THz, shall cover a wide spectral range providing the highest resolution and efficiency, generally for only a single polarization, within the specified spectral range. This contribution describes the optimization of the diffraction efficiency of the first diffractive order for a blazed metallic grating working at a large angle of incidence. Since the grating period is of the same order of magnitude as the wavelength, it is necessary to approach the design by solving Maxwell's equations rigorously using computational electromagnetism. We have applied the Rigorous Coupled-Wave Analysis and the Finite Element Methods to simulate the performance of the grating. This analysis provides relevant hints for the selection of the period, and the blaze and slant angles of the grating. A metallic blazed grating has been fabricated on aluminum and its topography has been characterized to determine the discrepancies with respect to the nominal values. The fabricated profile has been simulated to obtain the expected results in efficiency in comparison with the ideal case. This analysis provides guidance for improved manufacturing processes and experimental verification. A. Cuadrado et al., "Diffraction Efficiency of Reflective Metallic Gratings Operating in the THz Range," in IEEE Transactions on Terahertz Science and Technology, vol. 13, no. 6, pp. 605-613, Nov. 2023, doi: 10.1109/TTHZ.2023.3317774. 2156-342X 10.1109/TTHZ.2023.3317774 https://hdl.handle.net/20.500.14352/92382 2156-3446 https://doi.org/10.1109/TTHZ.2023.3317774 Diffraction Efficiency of Reflective Metallic Gratings Operating in the THz Range