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At more than 60 billion revolutions per minute, a nanomechanical rotor developed by Purdue University researcher Tongcang Li and co-authors is more than 100,000 times faster than a high-speed dental drill.
Ahn et al levitated a nanoparticle in vacuum and driven it to rotate at high speed, which they hope will help them study the properties of vacuum and quantum mechanics. Image credit: Vincent Walter, Purdue University.
Dr. Li and his colleagues from Peking University, Tsinghua University, Collaborative Innovation Center of Quantum Matter and Sandia National Laboratories synthesized a tiny dumbbell from silica and levitated it in high vacuum using a laser.
The laser can work in a straight line or in a circle — when it’s linear, the dumbbell vibrates, and when it’s circular, the dumbbell spins.
A spinning dumbbell functions as a rotor, and a vibrating dumbbell functions like an instrument for measuring tiny forces and torques, known as a torsion balance.
These devices were used to discover things like the gravitational constant and density of Earth, but the researchers hope that as they become more advanced, they’ll be able to study things like quantum mechanics and the properties of vacuum.
“People say that there is nothing in vacuum, but in physics, we know it’s not really empty,” Dr. Li said.
“There are a lot of virtual particles which may stay for a short time and then disappear.”
“We want to figure out what’s really going on there, and that’s why we want to make the most sensitive torsion balance.”
By observing this tiny dumbbell spin faster than anything before it, the team may also be able to learn things about vacuum friction and gravity.
Understanding these mechanisms is an essential goal for the modern generation of physics.
“Our study has many applications, including material science,” Dr. Li said.
“We can study the extreme conditions different materials can survive in.”
The research is published in the journal Physical Review Letters.
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Jonghoon Ahn et al. 2018. Optically Levitated Nanodumbbell Torsion Balance and GHz Nanomechanical Rotor. Phys. Rev. Lett 121 (3); doi: 10.1103/PhysRevLett.121.033603
