Xerox Engineering Research Fellows
2018 Research Opportunities
The Institute of Optics
Research Project: Myopia Development: Role of Optical Quality of the Eye
Myopia is one of the leading causes of visual impairment worldwide and is linked to severe eye diseases such as maculopathy, retinal detachment and glaucoma. The overall prevalence of myopia has increased substantially in recent years. With higher levels of myopia becoming a significant public health concern, it is of crucial importance to find effective treatments to slow myopic progression in children. Among many potential causes of myopia development such as genetics, visual environment, accommodative ability, research focus in this project is on understanding how the optics of the eye across the visual field influences myopia progression and control. The project provides a research opportunity to learn the human eye and visual optics by using advanced ocular imaging technology, adaptive optics vision simulator, and customized lens design using optical ray tracing.
Research Project: Secure Quantum Communication Based on “Twisted” Light
This project entails constructing a free-space optical communications system operating between two buildings on the UR campus. Our initial work will be performed with the transmitter and receiver telescopes both in the Wilmot building and with a retro-reflecting mirror placed on the roof of Bausch and Lomb Hall. The intent of the work is to develop a communications system that is entirely immune to the possibility of eavesdropping. This security is obtained by encoding the signal in the quantum wavefunction of individual photons. If an eavesdropper attempts to monitor this signal, she will necessarily change the quantum state of the photon, and do so in a manner that the sender and receiver can detect. A very special aspect of our approach is that we encode more than one bit of information on each photon. We do this by encoding in the Laguerre-Gauss modes of a light field. These modes exist in an infinite-dimensional Hilbert space; there is thus no fundamental limit to how much information can be carried by a single photon. These light modes also possess the exotic property of carrying orbital angular momentum. Also, their phase fronts form a helical structure; these are truly twisted light beams.
Research Project #1: High-reflectivity polymer cholesteric liquid crystal (PCLC) flake/fluid host devices for applications in optics, photonics, and information displays
Particles of cholesteric liquid crystal polymers (PCLC flakes) suspended in commodity host fluids form the basis of a patented reflective electro-optical technology that has numerous applications in optics, photonics, and flexible low-density information displays (e.g., billboards and large area signage). The ability to "sandwich" films of PCLC material of opposite optical "handedness" (left and right) enables electricallyswitchable, low cost devices that have brightly saturated colors with reflectivity exceeding 80% (nearly 2-3x the reflectivity of white paper), but the process for preparing "layered" PCLC flakes needs additional development and refinement. This project addresses the materials, processes and methods for achieving this goal.
Research Project #2; Photoswitchable liquid crystal gas permeation membranes for controlled gas delivery in scientific, biomedical, and alternative energy applications
Polymeric materials containing liquid crystal (LC) dyes that undergo photomechanical isomerization have demonstrated the ability to optically control and switch the flow of nitrogen gas over millisecond time intervals in response to irradiation of the membrane with UV and visible light. This patented materials technology in the form of a solid-state photoswitchable membrane would have applications in a number of areas, including delivery of breathing and anesthetic gases in biomedical applications and control of fuel gas flow on a micro scale for pulsed delivery of fuel cell hydrogen gas delivery to automobile engines. Considerable research using these materials remains to be done in assessing their effectiveness at controlling and switching gas flow using other gases and developing a prototype device for demonstration to obtain additional development funding. This project seeks to address the above objectives through exploiting recently available free-standing photoswitchable azobenzene LC polymer films developed for entirely different applications and determining their gas permeation photoswitching using specialized equipment developed and built in-house.