The polarization-sensitivity of an optical array - a periodic assembly of subwavelength resonators - has been hypothesized to be correlated to the degree of asymmetry of its individual resonators. However, the lack of a global quantifying measure of asymmetry makes the purposeful design of asymmetric structures intractable. This work takes a bottom-up approach to investigate how the controlled violation of two-dimensional symmetry in regular polygon-shaped nanoscale resonators affects the polarization sensitivity of lattice resonant silicon nitride nano-optical arrays. By focusing on visible light, these arrays serve as color sensors for diverse polarized light domains. While rectangle-shaped resonators lack chirality for sensing varying chiral light orientations, removing corners enables the selective enhancement of near-field electric and magnetic moments in response to clockwise- and counterclockwise-orientations of circularly polarized light. This selective enhancement of near-field electric and magnetic moments leads to unique far-field spectra and enables the development of a chiral light orientation color sensor.
The polarization sensitivity of a nano-optical array is hypothesized to correlate with the degree of asymmetry of its individual nanostructures. This work takes a top-down approach to investigate how controlled violations of two-dimensional symmetry in regular polygon-shaped nanostructures affect the polarization sensitivity of lattice resonant, dielectric nano-arrays. Such nanoarrays dampen higher-order Mie resonances while maintaining the fundamental Mie resonance. Isolating a fundamental Mie resonance in the visible region of the electromagnetic spectrum permits the mapping of a spectrum to a high-purity color. Through this, it becomes possible to build a colorimetric sensor of domains of rotations of linearly polarized light.
Iridescent structural color is abundant in nature, arising in the saturated blues of the Morpho butterfly wing or the greens of jewelled beetle shells. At the micrometer scale and smaller, these naturally occurring, three-dimensionally (3D)-architected photonic crystals are composed of ordered, geometrically anisotropic features which exhibit distinct interactions with polarized light.
Here, we design artificial 3D-architected colorimetric metasurfaces. We use two-photon lithography to fabricate multilayer grating structures which surpass the polarization-sensitive colorimetric response attainable in nature. Bringing additive manufacturing to the regime of visible light-matter interactions, our metasurfaces hold promise for versatile imaging, display and sensing technologies.
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