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Numerical Study of the Coupling of Sub-Terahertz Radiation to n-Channel Strained-Silicon MODFETs

1
NanoLab, Universidad de Salamanca, Plaza de la Merced, Edificio Trilingüe, 37008 Salamanca, Spain
2
Departament of Communications, Telecommunication Engineering School, Universitat Politècnica de València, 46022 Valencia, Spain
3
Department of Electrical and Electronic Engineering, Imperial College London, Exhibition Road, London SW7 2BT, UK
4
Department of Physics, Faculty of Sciences, Mohammed I University, Oujda 60000, Morocco
*
Author to whom correspondence should be addressed.
Academic Editor: Stefano Sfarra
Sensors 2021, 21(3), 688; https://doi.org/10.3390/s21030688
Received: 15 December 2020 / Revised: 11 January 2021 / Accepted: 18 January 2021 / Published: 20 January 2021
(This article belongs to the Special Issue Terahertz Emitters and Detectors)
This paper reports on a study of the response of a T-gate strained-Si MODFETs (modulation-doped field-effect transistor) under continuous-wave sub-THz excitation. The sub-THz response was measured using a two-tones solid-state source at 0.15 and 0.30 THz. The device response in the photovoltaic mode was non-resonant, in agreement with the Dyakonov and Shur model for plasma waves detectors. The maximum of the photoresponse was clearly higher under THz illumination at 0.15 THz than at 0.3 THz. A numerical study was conducted using three-dimensional (3D) electromagnetic simulations to delve into the coupling of THz radiation to the channel of the transistor. 3D simulations solving the Maxwell equations using a time-domain solver were performed. Simulations considering the full transistor structure, but without taking into account the bonding wires used to contact the transistor pads in experiments, showed an irrelevant role of the gate length in the coupling of the radiation to the device channel. Simulations, in contradiction with measurements, pointed to a better response at 0.3 THz than under 0.15 THz excitation in terms of the normalized electric field inside the channel. When including four 0.25 mm long bonding wires connected to the contact pads on the transistor, the normalized internal electric field induced along the transistor channel by the 0.15 THz beam was increased in 25 dB, revealing, therefore, the important role played by the bonding wires at this frequency. As a result, the more intense response of the transistor at 0.15 THz than at 0.3 THz experimentally found, must be attributed to the bonding wires. View Full-Text
Keywords: terahertz; SiGe; silicon; strained-Si; MODFET; electromagnetic simulation terahertz; SiGe; silicon; strained-Si; MODFET; electromagnetic simulation
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MDPI and ACS Style

Calvo-Gallego, J.; Delgado-Notario, J.A.; Velázquez-Pérez, J.E.; Ferrando-Bataller, M.; Fobelets, K.; Moussaouy, A.E.; Meziani, Y.M. Numerical Study of the Coupling of Sub-Terahertz Radiation to n-Channel Strained-Silicon MODFETs. Sensors 2021, 21, 688. https://doi.org/10.3390/s21030688

AMA Style

Calvo-Gallego J, Delgado-Notario JA, Velázquez-Pérez JE, Ferrando-Bataller M, Fobelets K, Moussaouy AE, Meziani YM. Numerical Study of the Coupling of Sub-Terahertz Radiation to n-Channel Strained-Silicon MODFETs. Sensors. 2021; 21(3):688. https://doi.org/10.3390/s21030688

Chicago/Turabian Style

Calvo-Gallego, Jaime; Delgado-Notario, Juan A.; Velázquez-Pérez, Jesús E.; Ferrando-Bataller, Miguel; Fobelets, Kristel; Moussaouy, Abdelaziz E.; Meziani, Yahya M. 2021. "Numerical Study of the Coupling of Sub-Terahertz Radiation to n-Channel Strained-Silicon MODFETs" Sensors 21, no. 3: 688. https://doi.org/10.3390/s21030688

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