Researchers at the Swinburne University of Technology (Australia) have found that the high uniformity of graphene oxide films creates microbubbles. They have an ideal spherical curvature that can be used as a concave reflective lens.
To demonstrate the new technology, the researchers used concave reflective lenses to focus light. The team said the lens is a high-quality focal spot and can be used as a light source for microscopic images. This high-quality bubble can be used in modern optoelectronic and micromechanical devices with high precision requirements.
With this technology, scientists will be able to create highly controlled microbubbles that can be altered based on the scientists’ needs. In the future, these lenses can be used as graphene microbubbles as dynamic and high-precision nanophotonic components for miniature laboratory-on-a-chip devices, as well as for wide application in high-resolution spectroscopy.
That is why the group used graphene oxide materials, which consist of a graphene film decorated with oxygen functional groups. Gases cannot penetrate graphene oxide materials, so the researchers used a laser to locally irradiate the film to create gases that would be embedded inside the film and form microbubbles – such as balls.
Researchers have already introduced concave reflective lenses for focusing light. The team says the lens is a high-quality focal spot and can be used as a light source for microscopic imaging.