Physical Mathematics Seminar
Tuesday, September 21, 2021 at 2:30pm to 3:30pm
77 Mass Avenue, Building 2, Room 449
Speaker: Valeri Frumkin (MIT)
Title: Fluidic Shaping of Optical Components on Earth and in Space
Current methods for fabricating lenses or mirrors rely on mechanical processing - such as grinding, machining, and polishing. The complexity of these fabrication processes and the required specialized equipment prohibit rapid prototyping of optical components, and puts a very high price tag on large lenses and freeform optics.
I will present a theoretical and experimental study where we leverage the basic physics of interfacial phenomena for rapidly fabricating a variety of lenses and freeform optical components with optical-grade surface quality and without the need for any mechanical processing. A key component in the process is the elimination of body forces through neutral buoyancy conditions yielding a method that is scale-invariant: it can be used to produce lenses of any size, while preserving the surface quality. I will show that the steady-state shape of fluidic lenses near neutral buoyancy conditions can be obtained by minimizing the free energy functional of the system, allowing to design various freeform optical topographies.
Lastly, I will discuss our collaboration with NASA on the use of this technology of in-space fabrication of optics and for the creation of large space telescopes that overcomes launch constraints.