Nonlinearity Engineering: From photonics to self-assembled nanostructures
This talk will review some of the advances we have made as we systematically develop this concept into an actionable capability,starting with exploiting self- similarity to turn what used to be severe limitations from optical nonlinearities to an advantage for ultrafast fiber lasers. Then, I will move on to introduce Nonlinear Laser Lithography — how we use nonlocal and nonlinear self-interference of a laser beam to fabricate self-assembled metal/metal-oxide nanostructure on various surfaces with unprecedented uniformity, solving a problem that dates back to 1965. I will then describe application of Nonlinear Laser Lithography to effortlessly create the first 3D photonic devices deep inside silicon through a different nonlocal effect. We also exploit the nonlinear interactions of femtosecond pulses with biological tissue: We use ablation cooling, a technique routinely used in rocket design since 1950’s, but so-far overlooked in optics, to achieve heat-damage -free removal of tissue at high speed. Finally, I will talk about our ongoing efforts to apply Nonlinearity Engineering to self-assembly of complex nanomaterials.
Reminder: Tea and cookies will be in the seminar room before the seminar.