Thermo-mechanical modeling of laser-driven non-contact transfer printing: two-dimensional analysis
Yonggang Huang (Northwestern University)
Eringen Medal Symposium in honor of G. Ravichandran
Mon 9:00 - 10:30
Salomon 001
Transfer printing is an emerging technique for materials assembly and micro-/nano-fabrication. An important emerging variant of this process involves laser-induced impulsive heating to initiate separation at the interface between a soft, elastomeric stamp and hard micro-/nano-materials (i.e. inks) on its surface, due to a large mismatch in coefcients of thermal expansion. The result is the active ejection of the inks from the stamp to a spatially separated receiving substrate, thereby representing the printing step. In the following, a thermo-mechanical model is established to analytically obtain the temperature eld, and the energy release rate for delamination at the interface between the stamp and ink in the form of a rigid plate. The normalized critical laser pulse time for interfacial delamination depends only on the normalized total heat ux at the interface and the normalized width of the ink structure. This scaling law has been veried by experiments and the nite element method.