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Collective input impedance of micro-antenna based infrared detectors
Optics Express
|March 17, 2021
Summary
This study uses input impedance to analyze collective resonances in infrared micro-dipole arrays. It reveals how dipolar interactions shift resonant modes and optimizes nano-bolometer performance using even modes.
Area of Science:
- Optics and Photonics
- Metamaterials
- Nanotechnology
Background:
- Infrared devices often use micro-dipole arrays.
- Understanding collective resonances is crucial for device performance.
- Scattered field analysis is a common characterization technique.
Purpose of the Study:
- To determine collective resonances in infrared micro-dipole arrays using input impedance.
- To investigate the influence of dipolar interactions on resonant modes.
- To optimize nano-bolometer performance in these arrays.
Main Methods:
- Finite-element simulations were employed.
- Input impedance concept was leveraged.
- Absorbance spectra of micro-antenna arrays were analyzed.
Main Results:
- The resistive and capacitive nature of odd and even resonant modes was unveiled.
- Collective modes showed opposite wavelength shifts due to dipolar interactions.
- Optical resonances were found equivalent to odd/even modes in short/open-circuit configurations.
- Performance optimization was achieved by exploiting collective even modes' high resistance.
Conclusions:
- Input impedance provides a method for analyzing collective resonances in micro-dipole arrays.
- Dipolar interactions significantly influence the behavior of resonant modes.
- Collective even modes offer a pathway for optimizing infrared device performance, particularly with nano-bolometers.
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