_ Department of nano laser and electronics
Nano Laser Electronics and Nano Laser (radiation and re-radiation structure)
Researcher and author: Dr. ( Afshin Rashid)
Note: Nano laser works on length scales 1000 times smaller than the thickness of human hair. The lifetime of the light captured in such small dimensions is so short that the light wave has only a few tens or hundreds of times to move up and down. Nanolasers open new perspectives for on-chip coherent light sources such as lasers that are extremely small and ultrafast.
The performance of nano lasers is based on fast conducting nanoparticles such as silver arranged in a periodic array. Unlike conventional lasers, where laser signal feedback is provided by conventional mirrors, nanolasers use radiative coupling between fast conducting nanoparticles such as silver. These 100 nm particles act as small antennas. To produce high-intensity laser light, the distance between the particles is matched to the laser wavelength so that all the particles in the array are irradiated in unison. Fluorescent organic molecules are used to provide the input energy (gain) required for nano lasers.
A fundamental challenge for nanolasers is the lack of sufficient light to be useful if not present in small dimensions. The light from the nano laser is not emitted and re-emitted. To solve the problem of radiation and its reflection, nano lasers are produced in the dark state of lasing. A dark state can be directly understood by considering regular antennas: a single antenna, when driven by one current, radiates strongly, while two antennas - if driven by opposite currents " A dark state in a nanoparticle array causes a similar flow of opposite phase in each nanoparticle, visible light frequencies." "Dark states for applications that They require low energy consumption and are attractive like nano lasers. But without any tricks, the dark mode laser is completely useless because the light is basically stuck in the nanoparticle array and can't get out. "But by using the small size of the array, an escape route is found for the light. Towards the edges of the array, the nanoparticles begin to reflect more and more like regular antennas radiating to the outside world.
Conclusion :
The performance of nano lasers is based on fast conducting nanoparticles such as silver arranged in a periodic array. Unlike conventional lasers, where laser signal feedback is provided by conventional mirrors, nanolasers use radiative coupling between fast conducting nanoparticles such as silver. These 100 nm particles act as small antennas. To produce high-intensity laser light, the distance between the particles is matched to the laser wavelength so that all the particles in the array are irradiated in unison.
Researcher and author: Dr. ( Afshin Rashid)
Specialized doctorate in nano-microelectronics