A study of the influence of high-frequency excitation on the quality of microstructures replicated by thermal imprint technologies

Friday, May 5, 2017 - 10:00
Dissertation Defence Hall (K. Donelaičio St. 73- 403 room)

Author, Institution: Rokas Šakalys, Kaunas University of Technology

Science Area, Field of Science: Technological Sciences, Mechanical Engineering – 09T

Summary of the Doctoral Thesis: Summary

Scientific Supervisor:  Prof. Dr. Habil. Arvydas PALEVIČIUS (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T).

Dissertation Defence Board of Mechanical Engineering Science Field:

Prof. Habil. Dr. Vytautas Ostaševičius (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T) – chairman
Dr. Rolanas Daukševičius (Kaunas University of Technology, Technological Sciences, Mechanical Engineering – 09T)
Prof. Dr. Sergei Kruchinin (Bogolyubov Institute for Theoretical Physics, Ukraine, Physical Sciences, Physics – 02P),
prof. dr. Vytenis Jankauskas (Aleksandras Stulginskis University, Technological Sciences, Mechanical Engineering – 09T) 

The Doctoral Dissertation is available on the internet and at the libraries of Kaunas University of Technology (K. Donelaičio St. 20, Kaunas) and Aleksandras Stulginskis University (Studentų g. 11, Akademija, Kauno raj.)

Annotation:
The dissertation investigates the influence of high-frequency excitation on the quality of microstructures, which are replicated applying thermal imprint technologies. Master topologically complex microstructure for the thermal replication is designed applying computer generated holography and fabricated using electron beam lithography. Vibroactive pads, which enable to generate uniform displacement field throughout the operating surface, therefore, ensuring that all points of replicated microstructure are homogenously affected by vibrations, were designed and fabricated for thermal imprint process. Finite element model enabling to analyze pre-stressed devices was developed for determining the operating frequencies, subsequently results were experimentally verified. The influence of high-frequency assisted thermal imprint process parameters on the quality of replicated microstructure was determined experimentally. The developed technology enables to replicate microstructures whose quality is close to theoretically ideal. Moreover, ultrasonic hot embossing technology was applied for the replication of microstructures and the influence of additional heat generation through the pre-structured polymer layers on the process parameters and quality of microstructure was determined.