Scientists from Nanyang Technological University (NTU) have developed a new type of ultracompact laser. This innovative device, which functions in the terahertz region, has the potential to transform wireless communication technologies. Led by Professor Wang Qijie from NTU’s School of Electrical and Electronic Engineering and the School of Physical and Mathematical Sciences, this advanced laser is designed to function at a frequency suitable for next-generation 6G communications.
The new laser technology is unique in that it emits light in the terahertz range, which covers frequencies between 30 micrometers and 3 millimeters. Backed with energy-efficient design, the device reduces loss of light in all directions, making it extremely effective for its operation. This invention could change the nature of high-speed wireless communications. Like the original LTE technology, it lays the groundwork for many times faster data transmission speeds.
Key Features of the Ultracompact Laser
The secret behind the unusual cavity lies in a periodic spatial structure of daisy-shaped holes embedded in a photonic crystal. This unique design employs an innovative semiconductor material that is sandwich between two layers of gold, working together to optimize performance. This very innovative arrangement not only minimizes the loss of emitted light but smartly organizes the directionality of propagation features of the emitted light.
A key feature of this laser is its “flat bands,” which are extremely shallow energy bands that form inside the photonic crystal. A schematic of the flat band structure providing the near-zero group velocity light waves demonstrate. Because of this, the energy carried by these waves remains trapped inside the horizontal plane of the laser cavity. This level of enclosure is essential for ensuring energy performance and minimizes operational losses significantly.
Dr Cui Jieyuan, a research fellow at NTU’s EEE, is the first author of the study. He further stressed that the flat band phenomenon is critical to achieving the desired operational characteristics of this laser. Accessible energy tremendously expands the potential applications for feat cutting across disciplines. That’s especially true when it comes to high-speed communication systems.
Implications for Future Wireless Communication
The importance of this ultracompact laser goes well beyond what it can do. It operates, at 94 GHz, at a frequency that is highly compatible with 6G communications. This functionality paves the way for higher data transfer speeds and more advanced connectivity in wireless technology. Now that the new 6G technology begins to materialize, this novel laser could prove essential. It is revolutionary in its potential to unlock the full capabilities of wireless networks.
Assoc Professor Zhen Bo, a well known specialist in photonics from the University of Pennsylvania, stressed what a crucial step this is. He said it represents a promising leap in laser technology. This exemplary partnership between NTU’s researchers and experts in the field is a powerful reminder of how interdisciplinary collaboration can accelerate progress and fuel innovation.
The research team recently published their findings in an academic paper. Find it online The work can be accessed with the DOI 10.1038/s41566-025-01665-6. This publication is intended to highlight their truly stellar efforts. In addition, it is a highly useful guide for more advanced study in both photonics and wireless communications.
