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Communication

Time-Resolved FDTD and Experimental FTIR Study of Gold Micropatch Arrays for Wavelength-Selective Mid-Infrared Optical Coupling

1
School of Information Technology, Halmstad University, SE-301 18 Halmstad, Sweden
2
Institute of Solid State Physics, University of Latvia, LV-1063 Riga, Latvia
3
Senseair AB, SE-824 08 Delsbo, Sweden
4
RISE Research Institutes of Sweden AB, Box 1070, SE-164 25 Kista, Sweden
*
Authors to whom correspondence should be addressed.
Academic Editor: Carlos Marques
Sensors 2021, 21(15), 5203; https://doi.org/10.3390/s21155203
Received: 28 June 2021 / Revised: 23 July 2021 / Accepted: 27 July 2021 / Published: 31 July 2021
(This article belongs to the Section Sensor Materials)
Infrared radiation reflection and transmission of a single layer of gold micropatch two-dimensional arrays, of patch length ∼1.0 μm and width ∼0.2 μm, have been carefully studied by a finite-difference time-domain (FDTD) method, and Fourier-transform infrared spectroscopy (FTIR). Through precision design of the micropatch array structure geometry, we achieve a significantly enhanced reflectance (85%), a substantial diffraction (10%), and a much reduced transmittance (5%) for an array of only 15% surface metal coverage. This results in an efficient far-field optical coupling with promising practical implications for efficient mid-infrared photodetectors. Most importantly we find that the propagating electromagnetic fields are transiently concentrated around the gold micropatch array in a time duration of tens of ns, providing us with a novel efficient near-field optical coupling. View Full-Text
Keywords: FDTD; FTIR; metal micropatch arrays; near field optics; far field optics; nano fabrication; electron beam lithography; infrared sensing FDTD; FTIR; metal micropatch arrays; near field optics; far field optics; nano fabrication; electron beam lithography; infrared sensing
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MDPI and ACS Style

Fu, Y.; Yager, T.; Chikvaidze, G.; Iyer, S.; Wang, Q. Time-Resolved FDTD and Experimental FTIR Study of Gold Micropatch Arrays for Wavelength-Selective Mid-Infrared Optical Coupling. Sensors 2021, 21, 5203. https://doi.org/10.3390/s21155203

AMA Style

Fu Y, Yager T, Chikvaidze G, Iyer S, Wang Q. Time-Resolved FDTD and Experimental FTIR Study of Gold Micropatch Arrays for Wavelength-Selective Mid-Infrared Optical Coupling. Sensors. 2021; 21(15):5203. https://doi.org/10.3390/s21155203

Chicago/Turabian Style

Fu, Ying, Tom Yager, George Chikvaidze, Srinivasan Iyer, and Qin Wang. 2021. "Time-Resolved FDTD and Experimental FTIR Study of Gold Micropatch Arrays for Wavelength-Selective Mid-Infrared Optical Coupling" Sensors 21, no. 15: 5203. https://doi.org/10.3390/s21155203

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