Our optical positioning and linking (OPAL) platform is based on optical tweezers and can assemble sub-micron heterogeneous materials in three dimensions (3D). OPAL is fully automated and can position hundreds of particles according to a set of desired predetermined coordinates. After positioning, particles are permanently liked together via biotin-avidin chemistry. We present how the fabrication speed, positional accuracy, and error rate depend on process parameters. The rapid prototyping of metamaterials and nanostructured optical chemical sensors will be discussed, as well as novel computational design approaches for these devices based on the discrete dipole approximation.
More sensitive toxic gas sensors can provide earlier warning by detecting lower concentrations at greater distances from the source than conventional technologies. Recently, microtoroid whispering gallery mode optical resonators with selective polymer coatings have demonstrated part-per-trillion sensitivity to several gases, making them one of the most sensitive gas detection technologies. However, these sensors are currently coupled to laser sources via fragile and vibration-sensitive tapered optical fibers, hindering their translation from the laboratory into the field. Here we design and assemble periodic nanostructures onto the rim of microtoroids to improve free-space coupling efficiency, obviating the need for the tapered optical fiber.
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