Engineers created the first electrically powered topological laser, Scientists have developed the first electrically driven “topological” laser that can transport light particles around the corner and correct errors in the production of the device.
An electrically powered semiconductor laser is the most commonly used laser device today.
They are used in products such as barcode readers and laser printers, for optical communications and in new applications such as automatic laser laser sensors.
However, the manufacturing process is thorough, and the current laser design does not function properly if a defect is inserted into the laser structure during this process. Now the engineers created the first electrically powered topological laser.
This is achieved by using concepts in theoretical physics known as topological conditions to create laser topologies.
In the 1980s, scientists discovered that electrons flowing in certain materials had “topological properties”, which meant that they could move at an angle or imperfection without scattering or flowing. The 2016 Nobel Prize in Physics was awarded to three theoretical physicists who had pioneered the study of the state of such an electron topology. engineers created the first electrically powered topological laser.
An interdisciplinary team of engineers and physicists from NTU Singapore, working with material scientists from the University of Leeds, applied this topological approach to light particles known as photons.
Each batch of laser devices manufactured has a part that does not emit laser light due to imperfections that occur during production and packaging, the researchers said.
This is one of our motivations for studying topological light conditions, which are much healthier than ordinary light waves.
In this study, the researchers worked on a type of electric motor called a quantum cascade laser, which is based on sophisticated semiconductor wafers and developed at the University of Leeds.
Researchers say: Laser topology is a good example of a fundamental scientific phenomenon that is applied to practical electronic devices, and as our research shows, this laser has the potential to improve the performance of laser systems. To achieve topological conditions on the laser platform, teams from NTU and Leeds developed a new design with photonic talk crystals inspired by an electronic topology material known as a two-dimensional Dalitron insulator. the engineers created the first electrically powered topological laser.
The design consists of hexagonal openings arranged in a triangular box and carved into semiconductor wafers, making it very compact.
Inside the microstructure, the topological light state circulates in a triangular circle with a circumference of 1.2 mm and acts as an optical resonator to accumulate the light energy needed to form a laser beam. The fact that light circulates in this circuit, including the acute angle orbit of a triangle, is due to the uniqueness of topological conditions, the researchers said.
Ordinary light waves will be disturbed by sharp angles, which will prevent them from circulating smoothly.
The researchers found that an interesting feature of the new topological quantum cascade laser was that the light emitted had terahertz frequencies between the microwave and infrared regions of the electromagnetic spectrum.
Terahertz Light has been identified as one of the main areas from which future technology applications in the field of sensors, lighting and wireless communications can emerge.
The research project lasted two years and included an interdisciplinary team of twelve researchers.
In the future, the team will work on lasers that use other types of topological conditions.
The design used in this project, called photonic talk crystals, is not the only way to create a topological state.
There are many types of topological conditions that offer protection from various types of imperfections. We believe that designs can be adapted to the needs of various devices and applications.
Researchers have shown that the topological light state can effectively move around corners and defects in the laser array.
However, this laser prototype has a disadvantage that is far greater than most semiconductor lasers and is “optically driven”, which means it is driven by another laser.