Can Be Used To Speed Up Optical Switching Green Laser Pointer

According to foreign media reports, scientists have demonstrated ultra-fast green laser pointer technology by combining organic dyes with metal nanostructures (gold nanoparticles) with fast laser pulses. This ultra-fast tuning speed can be used for sensors and optical switches.

The organic dye nanoparticle array laser shows a modulation bandwidth in excess of 100 GHz. Researchers have shown that the laser tuning speed can be adjusted by array parameters.

To conduct the experiment, a research team from Aalto University in Finland placed gold nanoparticles on glass and immersed the sample in an organic light-emitting material. These nanoparticles are arranged in a square pattern and are very close to each other. The researchers said that the arrangement (array) of nanoparticles improved the directionality of nano green laser pointers. The electric field located around the gold nano-particles will form a high field strength to accelerate the movement of molecules in organic dyes. Electromagnetic fields interact with conductive gold nanoparticles and interact with organic dyes to produce directional laser pulses with a pulse width of one trillionth of a second (picoseconds). Accelerated dynamics of the plasmonic mode are then observed on the blue side of the dye. The laser is squeezed by the gold nanoparticles to a sub-wavelength size, and then escapes from the surface lattice resonance mode at a picosecond speed and a concentrated laser pulse.

The pulses generated by the nanoparticle array laser are very fast and cannot be captured by a traditional electronic camera. Researchers use another laser as a “camera” to take very fast images of small lasers, a method called pump detection spectroscopy.

Due to the very fast speed, measuring the properties of the pulse is a major challenge. Paivi Torma said: “The key achievement of our realization this time is to successfully prove the ultra-fast characteristics of laser pulses through experiments. Green laser pointers emit light in the metal and the motion of electrons is mixed in optical modes. Surface lattice resonance. “This laser pulse can be used to increase the speed of optical communications and improve the performance of devices that use light to process information, such as cameras and transistors. Labs around the world have created very small nanolasers. But according to researchers, the ultra-fast potential of these nanolasers was confirmed by experimental results from the Aalto University team.

Researcher Konstantinos Daskalakis said: “We want to know the fastest speed at which laser devices can be turned on and off. The rapid generation of green laser pointer pulses is very useful in information processing and can also improve the response speed of some optoelectronic devices.”