A Low-loss Metasurface Antireflection Coating on Dispersive Surface Plasmon Structure

Area of Science:

• Optoelectronics
• Plasmonics
• Metasurfaces

Background:

• Metal hole arrays (MHAs) enhance light coupling in optoelectronic devices via surface plasmon polariton (SPP) resonances.
• Significant reflection losses at the MHA interface limit light coupling efficiency.
• Conventional antireflection (AR) coatings are ineffective due to MHA impedance dispersion.

Purpose of the Study:

• To develop an effective AR coating for MHAs that minimizes reflection and maximizes transmission at SPP resonances.
• To investigate the performance of a single-layer metasurface AR coating integrated with MHAs.
• To enhance the efficiency of optoelectronic devices utilizing MHAs.

Main Methods:

• Design and simulation of a single-layer metasurface AR coating.
• Integration of the metasurface with an MHA structure.
• Analysis of light reflection, transmission, and SPP resonance characteristics.
• Material property retrieval using an improved method.
• Analytical derivations and numerical simulations to identify AR coating mechanisms.

Main Results:

• The metasurface AR coating completely eliminated reflection and significantly increased transmission at SPP resonances.
• The metasurface exhibited extremely low loss (tan δ ≈ 0.005) and high effective permittivity.
• Off-resonance operation showed minimal loss and no resonant coupling with the MHA.
• SPP resonance wavelengths of the MHA remained unaffected, while surface wave coupling increased.

Conclusions:

• A single-layer metasurface AR coating effectively overcomes reflection losses in MHA-based optoelectronic devices.
• The developed metasurface enhances SPP resonance coupling, leading to improved device performance.
• The findings provide a pathway for advanced plasmonic device design and integration.