skip to Main Content
Drilling with the beam of an electron microscope, and light

ORNL scientists used an electron beam for precision machining of nanoscale materials. Cubes were milled to change their shape and also could be removed from an array. K. Roccapriore/ORNL, U.S. Department of Energy

Machining With A Microscope

Drilling with the beam of an electron microscope, scientists at the U.S. Department of Energy’s Oak Ridge National Laboratory precisely machined tiny, electrically conductive cubes that can interact with light and organised them in patterned structures that confine and relay the electromagnetic signal of light.

Source: Cutting Tool Engineering


This demonstration is a step toward potentially faster computer chips and more perceptive sensors. The seeming wizardry of these structures comes from the ability of their surfaces to support collective waves of electrons, which are called plasmons, with the same frequency as light waves but with much tighter confinement. The light-guiding structures are measured in nanometers, or billionths of a meter — 100,000 times thinner than a human hair.

Plasmonic phenomena first were observed in metals, which are conductive because of their free electrons. The ORNL team used cubes made of a transparent semiconductor that behaves like a metal: indium oxide doped — that is, a small impurity is added — with tin and fluorine.

The study builds on prior work to sculpt 3D structures as small as a nanometer with an electron beam.

“The current paper proves that the plasmonic effect, as well as the structure, can be sculpted,” said ORNL’s Kevin Roccapriore, first author of the study. “At the end of the day, we’re interested in the electron wave: Where is it, and what is its energy? We’re controlling those two things. We want to transition from using what exists in nature by chance to fabricating materials with the right responses,” said senior author Sergei Kalinin of ORNL. “We can take a system of cubes, shine light on it and channel energy into small volumes localized exactly where we want them to be.”

The project was a natural for Roccapriore, who conducted a lot of electron beam lithography in graduate school and even built a machine in his garage to make and mill 3D-printed structures. At ORNL, experimenting with the beam of an electron microscope, he adjusted its current to intentionally shift from imaging to modification mode.

He found he could remove bits of cubes or entire cubes from an array to make patterned objects at will. He also discovered that, just as the addition of chemical elements enables tuning of cube energies, so too does selective removal of chemical elements. Such atomic precision is possible with scanning transmission electron microscopy.

The scientists plan to create a library of relationships among materials, structures and plasmonic properties. That new knowledge will provide the foundational understanding needed to eventually mass-produce structures that can direct the flow of light in plasmonic nanocircuits.

“The idea is to understand the relationships using machine learning and then automate the process,” Roccapriore said.   

 

 

What You Missed:

Saccade Vision Uses Mems-Based Cameras To Improve Measuring And Quality Control
Order Cancellations Strike, 8-Inch Fab Capacity Utilisation Rate Declines Most In 2H22, Says TrendForce
Struggling Industries’ Bid To Hire Young Talent To Fill Jobs With $80k Salaries
Harvard Scientists Develop A Method To Restore Damaged Tendons And Muscles
Bosch Ready To Spend US$3 Billion To Help Solve Chip Demand
Malaysia’s Manufacturing, Construction, Service Sectors May Recruit Workers From 15 Countries
U.S. Senate Votes To Move Ahead On Chip Bill To Compete With China
3D Printed Bone Grafts To Be Approved For Patients In Europe
Solid State EV Batteries Could Cut Emissions By Up To 39 Percent
GM, Ford Seek U.S. OK To Deploy Self-Driving Vehicles Without Steering Wheels

 

 

WANT MORE INSIDER NEWS? SUBSCRIBE TO OUR DIGITAL MAGAZINE NOW!

 

CONNECT WITH US:  LinkedIn, Facebook, Twitter

 

Letter to the Editor
Do you have an opinion about this story? Do you have some thoughts you’d like to share with our readers? APMEN News would love to hear from you!

Email your letter to the Editorial Team at [email protected]

Bevan Looks To Continue Growth While 'Perfecting Our Art'
E-Catalogues Revolutionising The Cutting Tool Industry
Back To Top