OSA Student Chapter Meeting
TITLE: One-lens camera using a biologically based artificial compound eye with multiple focal lengths
Cameras are widely used in our daily life. To improve the photo quality taken by cameras, reducing optical aberrations is critical, which is usually achieved by increasing the number of lens elements. However, the greater the number of lens elements used in the camera, the greater its thickness. Camera factories need to struggle with both the camera's performance and size. In this recently published paper, researchers provide a way to minimize the number of lens elements and increase image quality at the same time.
SPEAKER: Christopher Marble
TITLE: Femtosecond optical curing of SU-8 photoresist at wavelengths transparent to silicon
SU-8 photoresist is used in numerous three-dimensional (3D) applications ranging from micro/nanoelectromechanical systems to microfluidics. Its biocompatibility and resistance to chemical attack has led to its use in tissue engineering and cell manipulation. SU-8 photoresist is commonly patterned via exposure to UV radiation; however, other exposure methods such as direct laser writing (DLW) via two-photon absorption have been employed in 3D applications. Understanding DLW in SU-8 is complicated by competing nonlinear processes. By choosing to expose SU-8 at 1.7 µm, we avoid multiphoton absorption and reliably polymerize SU-8 via the ionization of hot, nonequilibrated electrons. This process provides the opportunity for high aspect ratio patterning at wavelengths where silicon is optically transparent.
Friday, March 22 2019
IQSE 578, 12:30
Mitchell Physics Building
Department of Physics and Astronomy
Institute for Quantum Science and Engineering
Texas A&M University
(Pizza lunch as usual. Newcomers welcome!)
Host: Sean O'Connor
THE INSTITUTE FOR QUANTUM
SCIENCE AND ENGINEERING