Danish physicists present the smallest Christmas record in the world – with stereo sound

The first 25 seconds of the classic Christmas song were recorded on polymer film using the Nanofrazor 3D lithography system.

Physicists at the Technical University of Denmark (DTU) are injecting Christmas cheer by using a 3D nanoprinting tool called Nanofrazor to cut out the smallest record ever. The melody they “recorded” in full stereo no less than: the first 25 seconds of “Rocking Around the Christmas Tree”.

“Lithography has worked for 30 years, and even though we’ve had this machine for a while, it still sounds like science fiction,” said Peter Bugeld, a physicist at DTU. “To get an idea of ​​the scale we’re working at, we can Writing our signatures on a red blood cell with this thing. The most radical thing is that we can create free-form 3D landscapes with this crazy precision.”

Back in 2015, the same DTU group created a microscopic color image of Mona Lisa, about 10,000 times smaller than Leonardo da Vinci’s original painting. To do this, they created a nanosurface structure consisting of rows of pillars, covered with a layer of aluminum 20 nanometers thick. The amount of column distortion determines which colors of light are reflected, and the distortion is in turn determined by the intensity of the pulsed laser beam. For example, low-intensity pulses distorted the columns slightly, producing blue and purple tones, while strong pulses greatly distorted the columns, producing orange and yellow tones. The resulting image fits into an area smaller than a single pixel on the iPhone Retina display.

Mona Lisa with a pixel size of ten nanometers. “> Mona Lisa with a pixel size of ten nanometers. “src =” https://cdn.arstechnica.net/wp-content/uploads/2022/12/tinymonalisa-640×536.jpg “width =” 640 “height =” 536 “srcset =” https://cdn.arstechnica .net/wp-content/uploads/2022/12/tinymonalisa.jpg 2x” />
Zoom in / In 2015, the DTU Physics Group made a nanoscale Mona Lisa with a pixel size of ten nanometers.

DTU Physics

Nanofrazor was acquired by physics group DTU in order to sculpt precisely detailed 3D nanostructures quickly and relatively cheaply. The Christmas log was just a fun holiday project for postdoctoral researcher Nolan LaSallenne to demonstrate the ability to shape the surface with nanoscale precision. Rather than adding material to a surface, Nanofrazor precisely removes material to sculpt the surface into the desired pattern or shape—a type of gray-scale nanolithography.

“The Nanofrazor was operated like a record-cutting lathe—to turn the audio signal into a spiral groove on the surface of the medium,” said Bugeld, also an amateur musician and vinyl record enthusiast. In this case, the medium is a different polymer than vinyl. We even encoded the music in stereo—the side ripples are the left channel, while the depth modulation has the right channel. It can be impractical and expensive to become a hit record. To read the groove, you need to a fairly expensive atomic force microscope or Nanofrazor, but it’s certainly possible.”

The initial goal is to use Nanofrazor to develop new types of magnetic sensors capable of detecting currents in living brains. Lassaline plans to create “quantum soap bubbles” in graphene in hopes of discovering new ways to precisely manipulate electrons in this and other atomically thin materials. DTU physicist Tim Booth said, “The fact that we can now shape surfaces with nanoscale precision and at great imaginative speed is a game-changer for us. And we have many ideas for what to do next and we think this machine will speed up exponentially.” of prototypes for new structures.”

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