High contrast metastructures (HCMs) are an emerging solution for flat integrated photonic devices. These ultra-thin semiconductor ribbons can exhibit extraordinary properties that are atypical to traditional optical gratings, such as very broadband reflection at normal and shallow angles, high-Q resonances, and a readily engineered phase response. These properties have allowed for the design of a variety of novel optoelectronic devices such as vertical-cavity surface-emitting lasers (VCSELs), phase-arrays, lenses, and sensors.
In this work, we explore three different types of novel HCMs on silicon. The first is a hollow-core waveguide that can channel light at wavelengths where traditional solid waveguides encounter difficulties; next is a silicon-based HCG VCSEL with the potential of being an efficient light source for silicon PICs; and lastly, an integrated wavelength meter, which can circumvent bulky off-the shelf instruments to provide wavelength characterization of guided light on a chip.