Applied Physics Seminar

The physics and applications of two research topics will be introduced. Both are open to interested applied physics students.

1. Light interacting with CNT/polymer composite can be used to generate strong ultrasound pulses via optoacoustic effect. By creating a photoacoustic lens, within the focal zone a negative pressure over tens of MPa can be achieved, and steady cavitation bubbles are induced. The energy released from bubbles collapse are used for ablation of bio-tissues and generation of high-speed streams. We are exploiting a nozzle-free jet printing technique, where the high speed jet is used to print special ink materials such as 2D materials (graphene and MoS2) on flexible substrates.

2. There has been renewed interest in high-resolution nanopatterning by exploring plasmonics. We show that uniform, deep-subwavelength, and high aspect ratio structures can be obtained by using a plasmonic waveguide scheme and exploiting spatial light filtering; and pattern features much smaller than that on the mask can be realized by using epsilon-near-zero (ENZ) meta-material structure.