Despite the rapid growth of microfabrication technologies over the past decades, many desirable microstructures remain difficult or even impossible to create, especially when the structures are composed of multiple components that feature different materials that must be arranged in a highly specific, 3-D pattern. We have developed aqueous photoresists that can be used in combination with different techniques for nanomanipulation to create such structures. Multiphoton absorption polymerization can be used to create unsupported polymeric microstructures that can be nanomanipulated to place them in any desired position and orientation. Nanomanipulation techniques can also be used to place micro- or nanoscale components in desired locations in three dimensions, after which they can be immobilized photochemically. This toolbox of techniques offers the capability of creating a broad range of new structures and devices featuring polymeric, inorganic, metallic and biomolecular components.
Single QDs are desirable probe objects for studying near-field optical interactions with photonic structures, however, they are often very difficult to manipulate due to their small sizes. Here, we describe a technique for the manipulation of individual colloidal CdSe/ZnS quantum dots (QDs) with nanometer accuracy along a two dimensional surface. A microfluidic approach is described which provides two-dimensional positioning of single QDs with nanoscale accuracy. In addition, we discuss the engineering of a water-based fluid that provides localization of QDs to within 100 nm of the channel surface. Through a combination of surface localization and in plane manipulation, a setup is described where single QDs can be utilized as single emitter probes for studying local light-matter interactions in a planar geometry.
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