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Time-Resolved FDTD and Experimental FTIR Study of Gold Micropatch Arrays for Wavelength-Selective Mid-Infrared
Ying Fu1, Tom Yager2, George Chikvaidze2
1School of Information Technology, Halmstad University, SE-301 18 Halmstad, Sweden.
Sensors (Basel, Switzerland)
|August 10, 2021
Summary
Researchers designed gold micropatch arrays to enhance infrared radiation reflection for efficient optical coupling. This study demonstrates a novel near-field optical coupling method with potential applications in mid-infrared photodetectors.
Area of Science:
- Nanophotonics
- Metamaterials
- Infrared Optics
Background:
- Infrared radiation control is crucial for optical devices.
- Efficient optical coupling is essential for photodetector performance.
Purpose of the Study:
- To investigate infrared reflection and transmission of gold micropatch arrays.
- To achieve enhanced optical coupling using precisely designed nanostructures.
- To explore near-field and far-field optical coupling mechanisms.
Main Methods:
- Finite-difference time-domain (FDTD) simulations.
- Fourier-transform infrared spectroscopy (FTIR) measurements.
- Fabrication and characterization of gold micropatch arrays.
Main Results:
- Achieved 85% reflectance and 5% transmittance with 15% surface metal coverage.
- Demonstrated substantial diffraction (10%) due to array geometry.
- Observed transient concentration of electromagnetic fields (tens of ns).
Conclusions:
- Precision design of gold micropatch arrays enables efficient far-field optical coupling.
- Novel near-field optical coupling mechanism identified.
- Promising implications for efficient mid-infrared photodetector development.
