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Plasmonic and silicon spherical nanoparticle antireflective coatings
K V Baryshnikova1, M I Petrov1,2, V E Babicheva1,3
1ITMO University, Kronverkskiy, 49, St. Petersburg 197101, Russia.
Scientific Reports
|March 2, 2016
Summary
Both plasmonic (silver) and all-dielectric (silicon) nanoparticle coatings reduce light reflection for optical devices. Silicon coatings achieve zero reflectance via a novel substrate-mediated Kerker effect, enhancing absorbance in specific spectral ranges.
Area of Science:
- Nanophotonics
- Materials Science
- Optoelectronics
Background:
- Plasmonic nanostructures are widely used in optical and optoelectronic systems.
- All-dielectric photonics is emerging as an alternative optical technology.
- Antireflective coatings are crucial for applications like solar cells and photodetectors.
Purpose of the Study:
- To compare the antireflective properties of plasmonic (silver) and all-dielectric (silicon) nanoparticle coatings.
- To investigate the underlying physics of reflection suppression in silicon coatings.
- To evaluate the effectiveness of both coating types for thin-film photovoltaic applications.
Main Methods:
- Simulations of spherical nanoparticle arrays on amorphous silicon substrates.
- Analysis of optical properties, including reflectance and absorbance.
- Theoretical comparison of silver and silicon nanoparticle coating performance.
Main Results:
- Both silver and silicon nanoparticle coatings exhibit strong antireflective properties in the visible spectrum.
- Zero reflectance in silicon coatings is attributed to the substrate-mediated Kerker effect (destructive interference).
- Silver nanoparticles offer a broader, up to 30% increase in semiconductor absorbance.
- Silicon coatings provide a tunable, narrow-band absorbance increase of up to 64% via the substrate-mediated Kerker effect.
Conclusions:
- Silicon nanoparticle coatings demonstrate a novel mechanism for achieving zero reflectance and significant absorbance enhancement in specific spectral bands.
- The substrate-mediated Kerker effect in silicon coatings offers tunable performance for thin-film photovoltaic applications.
- Both plasmonic and all-dielectric coatings show promise, with distinct advantages depending on the application requirements.
