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Ultrawideband Polarization-Independent Nanoarchitectonics: A Perfect Metamaterial Absorber for Visible and Infrared
Mohammad Lutful Hakim1, Abu Hanif1, Touhidul Alam1,2
1Pusat Sains Ankasa (ANGKASA), Institut Perubahan Iklim, Universiti Kebangsaan Malaysia (UKM), Bangi 43600, Selangor, Malaysia.
Nanomaterials (Basel, Switzerland)
|August 26, 2022
Summary
This study introduces an ultrathin metamaterial absorber (MMA) for ultrawideband visible and infrared light. The novel design achieves over 90% absorption across a broad spectrum, showing promise for various optical applications.
Area of Science:
- Optics and Photonics
- Materials Science
- Metamaterials
Background:
- Metamaterial absorbers (MMAs) are crucial for optical applications, but achieving ultrawideband absorption remains a challenge.
- Existing designs often lack stability across various incident angles and polarizations.
Purpose of the Study:
- To numerically analyze an ultrathin concentric hexagonal ring resonator (CHRR) metamaterial absorber (MMA).
- To achieve ultrawideband absorption in the visible and infrared optical windows.
- To investigate polarization-independent and wide-angle absorption properties.
Main Methods:
- Numerical analysis of a CHRR MMA with a unit cell size of 66 × 66 nm².
- Utilizing nickel for top/bottom layers and aluminum nitride (AlN) as the substrate.
- Investigating design parameters, material properties, surface currents, and electromagnetic fields.
Main Results:
- Achieved absorption above 90% from 380 to 2500 nm (ultrawideband).
- Average absorbance of 96.64% across the operational bandwidth, with a peak of 99% at 618 nm.
- Demonstrated polarization-independent absorption and stable performance up to 70° incident angles.
Conclusions:
- The proposed hexagonal MMA offers excellent ultrawideband absorption performance.
- Its polarization-independent and wide-angle characteristics make it suitable for diverse optical applications.
- Potential applications include infrared detection, solar cells, gas sensors, and imaging.
