This chip is the dimensions of a fingernail and is made on skinny movie lithium niobate and can be utilized for information communications (web), or organic sensing as this chip is delicate to environmental change. Credit: RMIT University
Leading scientists within the discipline predict that lithium niobate chips, that are extraordinarily skinny, will surpass silicon chips in light-based applied sciences. These chips have a variety of potential functions, from detecting ripe fruit from a distance on Earth to guiding navigation on the Moon.
According to the scientists, the synthetic crystal of lithium niobate is the popular platform for these applied sciences due to its superior efficiency and developments in manufacturing methods.
RMIT University’s Distinguished Professor Arnan Mitchell and University of Adelaide’s Dr. Andy Boes led this staff of world specialists to evaluate lithium niobate’s capabilities and potential functions within the journal Science.
The worldwide staff, together with scientists from Peking University in China and Harvard University within the United States, is working with business to make navigation programs which might be deliberate to assist rovers drive on the Moon later this decade.
This chip is the dimensions of a fingernail and is made on a skinny movie of lithium niobate. It can be utilized in a spread of functions, together with in telecommunications to make our web quicker. Credit: RMIT University
As it’s inconceivable to make use of world positioning system (GPS) technology on the Moon, navigation systems in lunar rovers will need to use an alternative system, which is where the team’s innovation comes in.
By detecting tiny changes in laser light, the lithium-niobate chip can be used to measure movement without needing external signals, according to Mitchell.
“This is not science fiction – this artificial crystal is being used to develop a range of exciting applications. And the competition to harness the potential of this versatile technology is heating up,” said Mitchell, Director of the Integrated Photonics and Applications Centre.
He said while the lunar navigation device was in the early stages of development, the lithium niobate chip technology was “mature enough to be used in space applications”.
“Our lithium niobate chip technology is also flexible enough to be rapidly adapted to almost any application that uses light,” Mitchell said.
“We are focused on navigation now, but the same technology could also be used for linking the internet on the Moon to the internet on Earth.”
What is lithium niobate and how can it be used?
Lithium niobate is an artificial crystal that was first discovered in 1949 but is “back in vogue”, according to Boes.
“Lithium niobate has new uses in the field of photonics – the science and technology of light – because unlike other materials it can generate and manipulate electromagnetic waves across the full spectrum of light, from microwave to UV frequencies,” he said.
“Silicon was the material of choice for electronic circuits, but its limitations have become increasingly apparent in photonics.
“Lithium niobate has come back into vogue because of its superior capabilities, and advances in manufacturing mean that it is now readily available as thin films on semiconductor wafers.”
A layer of lithium niobate about 1,000 times thinner than a human hair is placed on a semiconductor wafer, Boes said.
“Photonic circuits are printed into the lithium niobate layer, which are tailored according to the chip’s intended use. A fingernail-sized chip may contain hundreds of different circuits,” he said.
How does the lunar navigation tech work?
The team is working with the Australian company Advanced Navigation to create optical gyroscopes, where laser light is launched in both clockwise and anticlockwise directions in a coil of fiber, Mitchell said.
“As the coil is moved the fiber is slightly shorter in one direction than the other, according to Albert Einstein’s theory of relativity,” he said.
“Our photonic chips are sensitive enough to measure this tiny difference and use it to determine how the coil is moving. If you can keep track of your movements, then you know where you are relative to where you started. This is called inertial navigation.”
Potential applications closer to home
This technology can also be used to remotely detect the ripeness of fruit.
“Gas emitted by ripe fruit is absorbed by light in the mid-infrared part of the spectrum,” Mitchell said.
“A drone hovering in an orchard would transmit light to another which would sense the degree to which the light is absorbed and when fruit is ready for harvesting.
“Our microchip technology is much smaller, cheaper, and more accurate than current technology and can be used with very small drones that won’t damage fruit trees.”
Next steps
Australia could become a global hub for manufacturing integrated photonic chips from lithium niobate that would have a major impact on applications in technology that use every part of the spectrum of light, Mitchell said.
“We have the technology to manufacture these chips in Australia and we have the industries that will use them,” he said.
“Photonic chips can now transform industries well beyond optical fiber communications.”
Reference: “Lithium niobate photonics: Unlocking the electromagnetic spectrum” by Andreas Boes, Lin Chang, Carsten Langrock, Mengjie Yu, Mian Zhang, Qiang Lin, Marko Lončar, Martin Fejer, John Bowers and Arnan Mitchell, 6 January 2023, Science.
DOI: 10.1126/science.abj4396
