Single-layer IR reflectors with wideband spectra.

We report the development and characterization of single-layer long-wave infrared reflectors with performance comparable to traditional multilayer Bragg stacks. By leveraging advancements in materials science and nanofabrication techniques, we explore the potential of single-layer structures to achieve high reflectance in the long-wave infrared (LWIR) spectral region. Through a combination of theoretical modeling and experimental validation, we demonstrate that these single-layer reflectors mimic the photonic stopband behavior characteristic of multilayer Bragg stacks.

Singular states of resonant nanophotonic lattices.

Fundamental effects in nanophotonic resonance systems focused on singular states and their properties are presented. Strongly related to lattice geometry and material composition, there appear resonant bright channels and non-resonant dark channels in the spectra. The bright state corresponds to high reflectivity guided-mode resonance (GMR) whereas the dark channel represents a bound state in the continuum (BIC).

Resonant reflection by microsphere arrays with AR-quenched Mie scattering.

Periodic guided-mode resonance structures which provide perfect reflection across sizeable spectral bandwidths have been known for decades and are now often referred to as metasurfaces and metamaterials. Although the underlying physics for these devices is explained by evanescent-wave excitation of leaky Bloch modes, a growing body of literature contends that local particle resonance is causative in perfect reflection. Here, we address differentiation of Mie resonance and guided-mode resonance in mediating resonant reflection by periodic particle assemblies.