Holographic microscope is small, cheap, ready for use in remote areas

holo_microscope
A prototype lensless holographic microscope developed at UCLA weighs about as much as a banana and fits in the palm of a hand. Its materials cost between $50 and $100. (Image: OSA)

 

Los Angeles, CA--A portable microscope developed at the University of California at Los Angeles (UCLA) and based on lensless holography is smaller and less costly than ordinary microscopes -- essential traits for an instrument meant to be used in remote areas of the world. Optics in the microscope are replaced by inexpensive holograms; because the design relies in part on mass-produced consumer electronics, all the materials to make the instrument add up to between $50 and $100.


Image constructed from interference pattern
Laser light is split into two beams, one that interacts with microscopic cells or particles in the sample, and the other that doesn't. The beams then pass to an adjacent sensor chip, where their interference pattern is recorded. Software then analyzes that pattern and recreates the path taken by the light that passed through or bounced off the objects being imaged. The laser could easily be the same as that in a $5 laser pointer; the sensor chip that collects that light is the same as the ones in the backs of iPhones and costs less than $15 per chip. The whole image-collecting system runs on two AA batteries.

The microscope can operate in a transmission mode that can be used to probe relatively large volumes of blood or water, or a reflection mode that can image denser, opaque samples. The spatial resolution for both modes is less than two micrometers.

Although the sensor captures raw data, a computer is required to reconstruct the images. Workers in the field could use their laptops to process the information or send it over the Internet or mobile phone networks to a remote server. Mobile phones could also have sufficient processing power to do the analysis on the spot. "We are replacing an expensive and bulky, heavy component with computer codes," says Aydogan Ozcan, senior author of the paper. The team describes the new device in a paper published in the Optical Society's (OSA's) open-access journal Biomedical Optics Express.1

With just a small amount of training, doctors could use devices like these to improve health care in remote areas of the world with little access to diagnostic equipment, Ozcan says. The handheld microscope could help ensure water quality, test patients' blood for harmful bacteria, and even be used for semen-quality monitoring on animal farms. It could also prove useful in health crises such as the recent outbreak of E. coli in Europe.

"It's a very challenging task to detect E. coli in low concentrations in water and food," Ozcan says. "This microscope could be part of a solution for field investigation of water, or food, or maybe pathogens in blood."

The next steps for Ozcan's team include commercializing the device. Ozcan says he has founded a company that is developing this technology, trying to make a version of the microscopes that can be manufactured and sold to health-care workers, as well as hobbyists.

Source: OSA

REFERENCE

1. M. Lee et al., Biomedical Optics Express, Vol. 2, No. 9, p. 2721 (2011).





50 YEARS OF SOLID-STATE LASERS


A long way from the ruby laser

Most Popular Articles

Webcasts

Multichannel Spectroscopy: Technology and Applications

This webcast, sponsored by Hamamatsu, highlights some of the photonic technology used in spectroscopy, and the resulting applications.

Handheld Spectrometers

Spectroscopy is a powerful and versatile tool that traditionally often required a large and bulky instrument. The combination of compact optics and modern pa...

Fracking, climate change, and lasers:  new tools to reduce fugitive methane emissions

This webcast, sponsored by Hamamatsu Corporation, covers recent developments and field deployments of compact quantum-cascade-laser (QCL)-based methane senso...

Opportunities in the Mid-IR

The technology for exploiting the mid-IR is developing rapidly:  it includes quantum-cascade lasers and other sources, spectroscopic instruments of many...
White Papers

Narrow-line fiber-coupled modules for DPAL pumping

A new series of fiber coupled diode laser modules optimized for DPAL pumping is presented, featur...

Accurate LED Source Modeling Using TracePro

Modern optical modeling programs allow product design engineers to create, analyze, and optimize ...

Optical Isolators Improve Engraving Performance of Pulsed Fiber Lasers

The deleterious effects of back reflections on pulsed fiber lasers used in marking and engraving ...
Technical Digests

WAVELENGTH-SWEPT LASERS: Dispersion-tuned fiber laser sweeps over a 140 nm range for OCT

By eliminating the use of mechanical tunable filters and instead tuning by intensity-modulation i...

Keeping pace with developments in Raman spectroscopy for molecular and nanoparticle research

For demanding or custom spectroscopy solutions, care must be taken in selecting and integrating a...

HIGH-POWER FIBER LASERS: Working in the kilowatt regime

High-power materials-processing fiber lasers are available in an increasing variety of forms, as ...

Click here to have your products listed in the Laser Focus World Buyers Guide.
Social Activity
  •  
  •  
  •  
  •  
  •  
Copyright © 2007-2014. PennWell Corporation, Tulsa, OK. All Rights Reserved.PRIVACY POLICY | TERMS AND CONDITIONS