All-Dielectric Colored Metasurfaces with Silicon Mie Resonators

Abstract

The photonic resonances hosted by nanostructures provide vivid colors that can be used as color filters instead of organic colors and pigments in photodetectors and printing technology. Metallic nanostructures have been widely studied due to their ability to sustain surface plasmons that resonantly interact with light. Most of the metallic nanoparticles behave as point-like electric multipoles. However, the needs of an another degree of freedom to tune the color of the photonic nanostructure together with the use of a reliable and cost-effective material are growing. Here, we report a technique to imprint colored images based on silicon nanoparticles that host low-order electric and magnetic Mie resonances. The interplay between the electric and magnetic resonances leads to a large palette of colors. This all-dielectric fabrication technique offers the advantage to use cost-effective, reliable, and sustainable materials to provide vivid color spanning the whole visible spectrum. The interest and potential of this all-dielectric printing technique are highlighted by reproducing at a micrometer scale a Mondrian painting.

Structural Color Filters Enabled by a Dielectric Metasurface Incorporating Hydrogenated Amorphous Silicon Nanodisks

“…As against the case of c-Si, amorphous silicon (a-Si) is presumed to offer a salient advantage that it can be efficiently grown over a foreign substrate at a low temperature so as to exhibit a high refractive index and be appreciably compatible with the cost-effective complementary metal-oxide-semiconductor (CMOS) process. In this context, several color filtering schemes were suggested relying on either a high-index film or a nanodisk in a-Si, yet the transmission was unbearably poor or the operation was limited to the reflective mode due to its high absorption in the visible band 20, 21, 39, 40 . To the best of our knowledge, there has been no report on a highly transmissive structural color filter that capitalizes on a subwavelength a-Si nanodisk, whose operation is valid throughout the visible band.…”

Active Color Control in a Metasurface by Polarization Rotation

“…As its geometric dimensions are comparable to the wavelength of visible light, a periodic array of nanostructures exhibits optical resonances at visible wavelength, thereby producing color that corresponds to the scattering spectrum. The structural color generation by the metasurfaces has been successfully demonstrated in plasmonics [1][2][3][4][5][6] and dielectric systems [7][8][9][10][11] using a variety of designs (See review papers [12][13][14][15][16] for details). However, as the geometry of nanostructures specifies scattering properties, an array of nanostructures usually produces only one fixed color.…”

Highly reflective subtractive color filters capitalizing on a silicon metasurface integrated with nanostructured aluminum mirrors

“…In view of its high refractive index of n = ∼4.0, Si is regarded as an eminent candidate for constructing a variety of metasurface. Recently, several reflection type structural color filters were reported based on Si, which can readily integrate into other optical/electrical devices , . The approach that taps into a Si metasurface is anticipated to exhibit a good stability and compactness , compared with the conventional Si nanowires of an extremely high aspect ratio .…”

“…For the transmission‐type filter based on a Si metasurface, it can provide higher efficiency beyond 90% than its plasmonic counterpart, which suffers from high conduction loss in the visible band . However, a reflection‐type filter, which capitalizes on Si metasurfaces formed on a Si substrate , may exhibit lower efficiency compared to its plasmonic counterpart , due to the low reflectivity of Si. It is resultantly evident that the crosstalk worsens while the color contrast is degraded.…”