A new type of infrared polaritons. Free Technical Library News

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A new type of infrared polaritons

28.08.2021

An international team of scientists have reported the first observation of ghost polaritons, which are a new form of surface waves that carry nanoscale light, are strongly coupled to material vibrations and have highly collimated propagation properties. The research team observed these phenomena in a common material - calcite - and showed how ghost polaritons can facilitate superior control of infrared nanolight for sensing, signal processing, energy harvesting and other technologies.

In recent years, infrared and terahertz nanophotonics have become important for highly sensitive, ultra-compact, low-loss technologies for biomolecular and chemical diagnostics, sensors, communications, and other applications. Nanomaterial platforms, which can facilitate enhanced light matter interactions at these frequencies, have become important to these technologies.

Recent work has used low-dimensional van der Waals materials such as graphene, hexagonal boron nitride, and alpha-phase molybdenum trioxide (alpha-MoO3) due to their highly exotic response to limited light at the nanoscale. However, these emerging nanomaterials require complex nanomanufacturing techniques that hinder large-scale nanophotonic technologies.

Polaritonics is the science and technology of exploiting the strong interactions of light with matter, and has revolutionized the optical sciences over the past few years.

"We used scattering-type scanning near-field optical microscopy (s-SNOM) to investigate these ghost polaritons," said first author Weiliang Ma, Ph.D., Ph.D. which is the record distance for polariton waves at room temperature."

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