Publications by authors named "Alexander J Littlefield"
Multiphoton lithography inside a mesoporous host can create optical components with continuously tunable refractive indices in three-dimensional (3D) space. However, the process is very sensitive at exposure doses near the photoresist threshold, leading previous work to reliably achieve only a fraction of the available refractive index range for a given material system. Here, we present a method for greatly enhancing the uniformity of the subsurface micro-optics, increasing the reliable index range from 0.
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- Direct laser writing (DLW) is a technique that creates precise 3D optical components, but is limited by the properties of the photopolymer used; researchers introduced the SCRIBE method, allowing for enhanced control over the refractive index in the materials.* ! -
- SCRIBE enables the creation of advanced optical elements like the world's smallest Luneburg lens and achromatic doublets in a single printing step, improving efficiency and performance in photonic designs.* ! -
- The method also demonstrates the ability to integrate multiple optical components, such as lenses and waveguides, into a compact photonic circuit, paving the way for more sophisticated optical systems.* !