Broadband Antireflection Coatings Employing Multiresonant Dielectric Metasurfaces

Keywords

antireflection coating; metamaterials; nanowires; optical resonators; silicon

Abstract

The energy efficiency of optoelectronic components and devices is critically dependent on minimizing undesired reflections from interfaces between materials with differing optical properties. Antireflection coatings based on metamaterials with deep-subwavelength features offer superior performance over their homogeneous counterparts as they afford subtle tuning of the refractive index and gradients therein. Recent work also showed that arrays of larger-sized (250 nm diameter), high-index nanostructures placed on semiconductor surfaces reduce the reflectivity by capitalizing on optical Mie resonances. Here, we start by demonstrating that a judiciously designed, single Mie resonator can enable perfect, local antireflection at its resonance frequency. This insight opens the door to the development of entirely new, multiresonant antireflection coating (ARC) designs in which differently sized Mie resonators manage antireflection at different wavelengths. We demonstrate the value of such multiresonant ARCs for solar applications by showing an average reflectivity as low as 4% from a silicon wafer across the visible range.

Publication Date

11-21-2018

Publication Title

ACS Photonics

Volume

5

Issue

11

Number of Pages

4456-4462

Document Type

Article

Personal Identifier

scopus

DOI Link

https://doi.org/10.1021/acsphotonics.8b00913

Socpus ID

85055121906 (Scopus)

Source API URL

https://api.elsevier.com/content/abstract/scopus_id/85055121906

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