  Along a single strand of micro-capillary optical waveguide, we achieved an
efficient transfer of the light momentum onto the liquid contained there
within, successfully atomizing it into nanoscale droplets. A hollow optical
fiber (HOF), with a ring core and central air hole, was used to optically drive
jetting of non-conducting transparent liquid of sub-pico liter volume, out of a
surface-treated facet orifice, producing droplets ranging from nano to
micrometer scale. These droplets were carried over the propagating light field
forming a spherical cone, which were then deposited on a silica substrate in a
Gaussian spatial distribution. The deposited patterns and sizes of individual
droplets were characterized as a function of the laser power, irradiation time,
and distance between the HOF and a substrate. This HOF based laser driven
atomization technique obviates imperative electrode or aerial pressure
requirements in prior methods, opening a new pathway to drastically scale down
the form-factor of liquid jetting devices, and has a high potential to in-situ
atomization and delivery of bio-medical non-conducting liquids in a microscopic
environment, which was not possible in prior arts.
