Snapshots of the research conducted by the UCOM consortium:
From the research work of ESR11, Dawid Surdeko (UT):
a) Experimental setup consisting of a glass chamber, at the bottom of which is placed a silicon substrate with a cylindrical pit etched into it. The radius of the pit is 25 µm and the depth is ~ 120 µm. The chamber is filled with water or other liquid of choice. Due to surface tension a bubble is trapped in the pit. On top of the chamber a glass slide is placed to limitevaporationof water and to provide an even plane for imaging purposes. Glued to the bottom of the chamber is a piezoelectric element that drives the system. The movement of the surface of the bubble, induced by the piezoelectric element, is observed from the top using a Digital Holographic Microscope (DHM) – a device using using laser light interference to precisely measure the movement of an observed object in the direction of the laser beam. Additionally, the bubble can be observed from the side using an ultra-fast camera.
b) Some of the modes of oscillations of a clamped circular membrane. A model of the system predicts that the surface of the bubble behaves like such a membrane and therefore its movement can be described using these modes.
c) Sample images obtained using the DHM: 1) holographic image (the result of light interference), 2) non-processed phase image obtained from the holographic image, 3) processed phase image, presenting displacement of the surface of the bubble at a given point in time.