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Now Available: Innovators Under 35 2013 See The 2013 List »

35 Innovators Under 35

Pratheev Sreetharan, 28

Mass-producible tiny machines snap into place like objects in a pop-up book

Vibrant Research

Combining tools used to manufacture printed circuit boards with the spirit of origami, Pratheev ­Sreetharan has found a way to build tiny machines and complex objects that were previously impossible to fabricate without assembling them manually. Some of the results: a robotic bee created in a day, a tiny, precise icosahedron, and a small chain of interlocking carbon-fiber links. The small, intricate items demonstrate a fundamentally new fabrication approach that ­Sreetharan believes can be broadly applicable in making a range of new medical devices, robots, and components of analytical instruments.

If Sreetharan is successful, he could open up the manufacturing no-man’s-land between the micrometer­-scale features of silicon chips and the centimeter-plus scale of everyday items. It’s a size range that’s of critical importance in biology and medicine. But today there’s simply no practical way to mass-produce three-­dimensional objects and complex machines on this in-between scale.

Sreetharan’s prize creation is the robot bee, fabricated through a series of steps inspired by pop-up books. As a graduate student in the lab of Harvard microrobotics pioneer Robert Wood (a member of the 2008 TR35), Sreetharan was familiar with the task of laboriously gluing the miniature robots together under a microscope, and his fabrication approach was born of his determination to find a better way.

He began by adapting standard lamination and micromachining techniques from circuit board manufacturing to carve the needed parts into a flat substrate. But the real trick came in adding features that allowed the parts to pop up and lock into place in one step, creating the bee.

Sreetharan, who spent a recent summer in the Indian region of Tamil Nadu teaching Sri Lankan refugees about renewable energy and designing a solar-powered computer charger, recently got his PhD from Harvard and founded a startup called Vibrant Research in Cambridge, Massachusetts, to adapt his fabrication methods to advanced manufacturing.

He is still deciding which specific products the company will focus on, but he says he is able to routinely make objects that have never before existed. And he hopes the novel production methods will create new opportunities in manufacturing. That would be a pretty good way to build on the buzz from his robot bee.

David Rotman

2012 TR35 Winners

Sarbajit Banerjee (video)

Windows that block heat—but let it through when you want them to

Mircea Dincă

Using sponges to improve and store alternative fuels

Prashant Jain

Tuning nanocrystals to make tinier, more efficient switches for optical computing and solar panels

Nanshu Lu (video)

Soft, flexible electronics bond to skin and even organs for better health monitoring

Joyce Poon (video)

A tiny roller coaster for light could help keep data ­centers cool

Pratheev Sreetharan (video)

Mass-producible tiny machines snap into place like objects in a pop-up book

Bozhi Tian (video)

Artificial tissue that can monitor and improve health down to the level of individual cells

Zheng Wang (video)

Slowing light to help chips cope with optical data

Baile Zhang

A new type of invisibility cloak made from a common material can work with larger objects

See This Years' Winners

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