Manipulation of fluids in three-dimensional porous photonic structures with patterned surface properties

摘要

A three-dimensional porous photonic structure, whose internal pore surfaces can be provided with desired surface properties in a spatially selective manner with arbitrary patterns, and methods for making the same are described. When exposed to a fluid (e.g., via immersion or wicking), the fluid can selectively penetrate the regions of the structure with compatible surface properties. Broad applications, for example in security, encryption and document authentication, as well as in areas such as simple microfluidics and diagnostics, are anticipated.

主权项

1. A suspension comprising:
a plurality of non-spherical, microstructured photonic crystal particles suspended in a liquid medium, each particle comprising a porous three-dimensional photonic crystal, said photonic crystal comprising a matrix material defining a plurality of pores and a plurality of nanoparticles dispersed within the matrix material, wherein said plurality of non-spherical, microstructured photonic crystal particle are obtained by templating against a microstructured surface to form photonic crystal particles that have a non-spherical shape defined by the microstructured surface; wherein the size of the particles, the size of the pores of the photonic crystal, and the size of the nanoparticles provide a response in the visible wavelengths.