Novel 人妻少妇专区 solution paves the way for cutting-edge photonics.
One of the most tedious, daunting tasks for undergraduate assistants in university research labs involves looking hours on end through a microscope at samples of material, trying to find monolayers.
These two-dimensional materials鈥攍ess than 1/100,000th the width of a human hair鈥攁re highly sought for use in electronics, photonics, and optoelectronic devices because of their unique properties.
鈥淩esearch labs hire armies of undergraduates to do nothing but look for monolayers,鈥� says , an assistant professor of optics at the . 鈥淚t鈥檚 very tedious, and if you get tired, you might miss some of the monolayers or you might start making misidentifications.鈥�
Even after all that work, the labs then must doublecheck the materials with expensive Raman spectroscopy or atomic force microscopy.
Jes煤s S谩nchez Ju谩rez, a PhD student in the , has made life a whole lot easier for those undergraduates, their research labs, and companies that encounter similar difficulties in detecting monolayers.
The breakthrough technology, an automated scanning device described in , can detect monolayers with 99.9 percent accuracy鈥攕urpassing any other method to date.
At a fraction of the cost. In far less time. With readily available materials.
鈥淥ne of the main objectives was to develop a system with a very small budget so that students and labs can replicate these methodologies without having to invest thousands and thousands of dollars just to buy the necessary equipment,鈥� says S谩nchez Ju谩rez, the lead author of the paper.
For example, the device he created can be replicated with an inexpensive microscope with a 5X objective lens and a low-cost OEM (original equipment manufacturer) camera.
A creative adaptation of an AI neural network
鈥淲e鈥檙e very excited,鈥� Cardenas says. 鈥淛es煤s did several things here that are new and different, applying artificial intelligence in a novel way to solve a major problem in the use of 2D materials.鈥�
Many labs have tried to eliminate the need for human scanning costly backup characterization tests by training an artificial intelligence (AI) neural network to scan for the monolayers. Most labs that have tried this approach attempt to build a network from scratch, which takes significant time, Cardenas says.
Instead, S谩nchez Ju谩rez started with a publicly available neural network called that is already trained to recognize objects.
He then developed a novel process that inverts images of materials so that whatever was bright on the original image instead appears black, and vice versa. The inverted images are run through additional processing steps. At that point, the images 鈥渄on鈥檛 look good at all to the human eye,鈥� Cardenas says, 鈥渂ut for a computer makes it easier to separate the monolayers from the substrates they are deposited on.鈥�
Bottom line: Compared to those long, tedious hours of scanning by undergraduates, S谩nchez Ju谩rez鈥檚 system can process 100 images covering 1 centimeter x 1 centimeter-sized samples in nine minutes with near 100 percent accuracy.
鈥淥ur demonstration paves the way for automated production of monolayer materials for use in research and industrial settings by greatly reducing the processing time,鈥� S谩nchez Ju谩rez writes in the paper. Applications include 2D materials suitable for photodetectors, excitonic light-emitting devices (LEDs), lasers, optical generation of spin鈥搗alley currents, single photon emission, and modulators.
Additional coauthors include Marissa Granados Baez, a PhD student in the Cardenas Lab, and Alberto A. Aguilar-Lasserre, a professor at the Instituto Tecnol贸gico de Orizaba.
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