Circuit based optoelectronic tweezers

摘要

A microfluidic optoelectronic tweezers (OET) device can comprise dielectrophoresis (DEP) electrodes that can be activated and deactivated by controlling a beam of light directed onto photosensitive elements that are disposed in locations that are spaced apart from the DEP electrodes. The photosensitive elements can be photodiodes, which can switch the switch mechanisms that connect the DEP electrodes to a power electrode between an off state and an on state.

主权项

1. A microfluidic apparatus comprising:
a circuit substrate comprising a surface and dielectrophoresis (DEP) electrodes at different locations on said surface; a chamber configured to contain a liquid medium disposed on said surface of said circuit substrate; a first electrode disposed to be in electrical contact with said medium; a second electrode disposed to be electrically insulated from said medium; switch mechanisms each disposed between a different corresponding one of said DEP electrodes and said second electrode, wherein each said switch mechanism is switchable between an off state in which said corresponding DEP electrode is deactivated and an on state in which said corresponding DEP electrode is activated; and photosensitive elements each configured to provide an output signal for controlling a different corresponding one of said switch mechanisms in accordance with a beam of light directed onto said photosensitive element.