Lensfree Telemedicine Microscopy on a Wireless Phone

We present a lensfree digital microscopy platform implemented on a cell-phone. It operates based on digital in-line holography and provides a compact and light-weight alternative to conventional microscopes, such that the cell-phone is modified with an inexpensive attachment weighing only ~38 grams. This lensfree cell-phone microscope captures holographic images of the objects which are then rapidly processed by a custom-developed reconstruction algorithm to provide microscopic images of the sample. This mechanically-robust cellphone microscope achieves a numerical aperture of ~0.1-0.2 over an imaging field-of-view (FOV) of ~24 mm and may provide a cost-effective and field-portable diagnostics tool for telemedicine applications.