Polaritons are a new tool. To control light.

Illustrative scenario of propagation of DPP, at Terahertz frequencies, induced by the tip of a s-SNOM microscope in topological insulators coupled nano-antennas. Credit: Leonardo Viti et al.(ScitechDaily, Scientists Unlock New Way To Control Exotic Light Waves in 2D Materials)

Polariton is the quasiparticle that forms when other quasiparticles, like excitons and phonons, make a strong connection with photons. 

“Surface plasmon polaritons (SPPs) are electromagnetic waves that travel along a metal–dielectric or metal–air interface, practically in the infrared or visible frequency. The term "surface plasmon polariton" explains that the wave involves both charge motion in the metal ("surface plasmon") and electromagnetic waves in the air or dielectric ("polariton")”. (Wikipedia, Surface plasmon polariton)

“Surface plasmons (SPs) are coherent delocalized electron oscillations that exist at the interface between any two materials where the real part of the dielectric function changes sign across the interface (e.g. a metal-dielectric interface, such as a metal sheet in air). SPs have lower energy than bulk (or volume) plasmons which quantise the longitudinal electron oscillations about positive ion cores within the bulk of an electron gas (or plasma).”(Wikipedia, Surface plasmon)

“Schematic representation of an electron density wave propagating along a metal–dielectric interface. The charge density oscillations and associated electromagnetic fields are called surface plasmon-polariton waves. The exponential dependence of the electromagnetic field intensity on the distance away from the interface is shown on the right. These waves can be excited very efficiently with light in the visible range of the electromagnetic spectrum.”(Wikipedia, Surface plasmon)

Surface plasmon polaritons (SPP) are tools that can be used to create systems that change the wavelength of the reflecting radiation. The polariton is one of the quasiparticles. The quasiparticle is the electromagnetic field or anomaly in the electromagnetic field that acts like a real particle. The quasiparticle can be used to trap other particles in its position. When we think about excitons. Quasiparticles that are holes in electromagnetic fields, there is a possibility to trap an electron, quark, or some other small particle above it. An exciton forms when an electron jumps out from its trajectory, and then it starts to orbit its own hole. That means the exciton behaves like a real particle, but there, in the position of the protons, is the electron hole. 

In quantum systems, those hovering particles can create quantum entanglement between them. 

Another thing. That can make things interesting are polaritons. Surface polaritons are like stickers. With standing waves above the surface. Those things can make it possible. To control light and other electromagnetic radiation over the layer. 

The Dirac Plasmon Polaritons (DPP) are one way to control light in 2D metamaterials. That thing makes it possible to create quantum entanglements between those quantum dots. Another thing that the DPP can make. It is to control the light on the material's surface. The DPP polariton is the quasiparticle. That forms from the wrapped and standing light waves, those polaritons can make the system. Which makes it possible. To adjust the reflecting light wavelengths. This thing means. That the DPP polritons can form the virtual surface that acts like a surface. With the physical waveform. The DPP polariton makes it possible. To make a reflection that scatters around. This makes the structure harder to see. There is also a possibility. To create a system that can adjust the wavelength of the radiation. 

The thing that the DPP polariton- or some other quasiparticle can make it to stretch or warp the wave movement, and that can make it possible to transform IR-radiation into radio waves. Or in the most interesting model, the polariton can transform things like gamma rays. into radio or IR waves. And if that technology is possible someday, researchers can create a system. That can transform other radiation types. Into gravitational waves. Theoretically, that is possible by adjusting the wavelength of the radiation. 

https://en.wikipedia.org/wiki/Exciton

https://en.wikipedia.org/wiki/Polariton

https://en.wikipedia.org/wiki/Quasiparticle

https://en.wikipedia.org/wiki/Surface_plasmon

https://en.wikipedia.org/wiki/Surface_plasmon_polariton