RT Journal Article
T1 Diffraction Efficiency of Reflective Metallic Gratings Operating in the THz Range
A1 Cuadrado Conde, Alexander
A1 Fernández Rodríguez, Marianela
A1 Sánchez Brea, Luis Miguel
A1 García Lozano, Gonzalo
A1 Mercant, Guillermo
A1 Torquemada, Mº Carmen
A1 Alda Serrano, Javier
A1 Gonzalez, Luis M.
A1 Belenguer Dávila, Tomás
AB 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.
PB IEEE Xplore
SN 2156-342X
YR 2023
FD 2023
LK https://hdl.handle.net/20.500.14352/92382
UL https://hdl.handle.net/20.500.14352/92382
LA eng
NO 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.
NO Ministerio de Ciencia y Universidades (España)
NO Ministerio de Ciencia e Innovación (España)
NO Comunidad de Madrid (España)
DS Docta Complutense
RD 22 abr 2025