The new field of Volumetric Additive Manufacturing (VAM) optically prints 3D structures into a sealed, fixed volume of liquid photosensitive resin via tomographically computed projections. Since resin need not move during printing, writing into very high viscosity or even solid materials becomes possible, enabling final print material properties previously unattainable...

Diffusive photopolymers were first developed by Bruce Booth at Dupont for holography. We use a two-polymer approach introduced by Lisa Dhar and colleagues at Lucent . These materials contain two monomers, in which the first monomer is thermally or optically gelled, providing a physical scaffold to support encapsulated elements or...

The integrated circuits in your computer or car require manufacturing processes capable of patterning billions of nanometer-scale features every second with near perfect accuracy. Moore's Law , the 50-year trend of continually smaller structures resulting in continually more powerful electronics, is possibly nearing its end. The challenge faced by the...

Three dimensional printing of polymers can be done through a moving orifice (e.g. fused deposition) or by photopolymerizing a liquid (e.g. stereolithography). In 2013, we developed a new form of stereolithographic printer using an image projector, a PDMS coated window and a moving platform, as shown below. This system can...

Organic electrochemical transistors (OECTs) are thin-film transistors with an organic semiconductor channel between source and drain electrodes. OECTs are structured much like organic field-effect transistors (OFETs) with the distinction that OECTs have an electrolyte layer between the channel and the gate electrode instead of a standard dielectric. We develop and...

Holographic photopolymers were developed, as the name implies, for holography. However, they can be programmed with a variety of gradient index (GRIN) structures including diffractive and refractive lenses. The polymers self develop in respnse to light, enabling complex 3D GRIN structure not possible with traditional processes that rely on diffusion...