Combination of quantum well and gold nanoparticles to change the wavelength of light
Topic: science and research #gold_particles #nano_tools
News date: 05/28/2016
By combining a quantum well and gold nanoparticles, the researchers managed to provide a tool that is capable of converting the wavelength and frequency of light.
A research team from Rice University succeeded in presenting a method by which light can be converted into different wavelengths. For this purpose, the researchers made a combined structure of plasmonic metals and semiconductor quantum wells. This technology can be used to improve the wave frequency.
Plasmonic nanostructures are usually used for light conversion. In this method, holes and electrons are produced from the plasmon decay that occurs due to radiation to metal nanoparticles. This electron and hole from the nanoparticle are injected into the quantum well, where they are converted into high-energy photons by recombination.
Rice University researchers showed that using GaN/InGaN quantum wells and silver and gold nanoparticles, photons can be converted from 2.4 to 2.8 electron volts.
Gururaj Naik says: “Wave conversion using organic molecules and lanthanides causes the emission and absorption of light at different frequencies; Because the level of atomic and molecular energy in this structure is set in such a way that this photon conversion is done. We can design quantum wells whose band gap is tuned to produce a specific optical frequency. The same design can be changed in such a way that it is possible to absorb different frequencies. This means that we can do recruitment and publishing independently; Something that was not possible before.”
In these experiments, a 100 nm pole with gold nanoparticles on its tip was used. When light with a specific wavelength is irradiated to these nanoparticles, the nanoparticles convert the light energy into plasmons. This plasmon has a short life and emits its energy in the form of photons or it turns it into heat.
Hot carriers, which are electrons and holes, are driven to GaN and InGaN, which are actually quantum wells that trap electrons. The recombination process has happened in these quantum wells and a high frequency beam is produced.
The results of this project have been published in the journal Nano Letters.
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Source:
https://www.photonics.com/Article.aspx?AID=62299
This post is written by NanoBioLab