University of Michigan researchers have demonstrated what’s believed to be the first practical polariton laser, which makes light beams in a more efficient way than conventional lasers. To accomplish this, they devised an innovative design that involved moving the required mirrors from the top and bottom of the device to the sides. The mirrors are represented by the gray bars. The yellow is the electrode through which the researchers stimulate the laser. The purple is the gallium nitride semiconductor that is able to maintain ideal conditions for polaritons to form and release light. Image credit: Thomas Frost
The beam they demonstrated was ultraviolet and very low power — less than a millionth of a watt. For context, the laser in a CD player is about one-thousandth of a watt.
With precarious particles called polaritons that straddle the worlds of light and matter, University of Michigan researchers have demonstrated a new, practical and potentially more efficient way to make a coherent laser-like beam.
They have made what’s believed to be the first polariton laser that is fueled by electrical current as opposed to light, and also works at room temperature, rather than way below zero.
Those attributes make the device the most real-world ready of the handful of polariton lasers ever developed. It represents a milestone like none the field has seen since the invention of the most common type of laser – the semiconductor diode – in the early 1960s, the researchers say. While the first lasers were made in the 1950s, it wasn’t until the semiconductor version, fueled by electricity rather than light, that the technology took off.
This work could advance efforts to put lasers on computer circuits to replace wire connections, leading to smaller and more powerful electronics. It may also have applications in medical devices and treatments and more.
The Latest on: Polariton laser
via Google News
The Latest on: Polariton laser
- Scientists Stuff Graphene with Lighton November 17, 2020 at 8:45 am
They relied on a laser-like energy conversion scheme and collective resonances ... The dot interacts with light at a wavelength of 1.55 micrometers and with the surface plasmon-polariton at 3.5 ...
- No losses: Scientists stuff graphene with lighton November 16, 2020 at 6:40 am
Physicists from MIPT and Vladimir State University, Russia, have converted light energy into surface waves on graphene with nearly 90% efficiency. They relied on a laser-like energy conversion scheme ...
- Scientists achieve 90% efficiency converting light energy into surface waves on grapheneon November 16, 2020 at 4:57 am
Laser & Photonics Reviews) (click on image to enlarge ... The dot interacts with light at a wavelength of 1.55 micrometers and with the surface plasmon-polariton at 3.5 micrometers. This is enabled by ...
- Family of unusual quasiparticles discovered in graphene-based materialson November 13, 2020 at 6:42 am
Scientists have discovered a new family of quasiparticles that defy textbook physics. Researchers found the particles, called Brown-Zak fermions, in graphene-based superlattices.
- System Bits: Oct. 3on October 2, 2020 at 5:00 pm
Theses ‘magic dust’ polaritons are created by shining a laser at stacked layers of selected atoms such ... The team added that they are just at the beginning of exploring the potential of polariton ...
- Dr Jenny Clarkon December 14, 2018 at 11:14 pm
To study organic semiconductors and biological samples, we mainly use transient absorption spectroscopy. This technique uses laser pulses as short as 7 femtoseconds (7 millionths of a billionth of a ...
via Bing News