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Programmable Bloch polaritons in graphene. | LitMetric

AI Article Synopsis

  • Researchers combined infrared photons with graphene electrons to create new quasi-particles called surface plasmon polaritons (SPPs) that can be controlled in unique ways.
  • By introducing periodic changes in the carrier density, they transformed standard SPPs into Bloch polaritons, allowing for distinct energy bands and manipulation of their behavior.
  • The study demonstrated that by adjusting the gate voltage, they could direct these Bloch polaritons, highlighting potential advancements for on-chip photonic circuits in future technology.

Article Abstract

Efficient control of photons is enabled by hybridizing light with matter. The resulting light-matter quasi-particles can be readily programmed by manipulating either their photonic or matter constituents. Here, we hybridized infrared photons with graphene Dirac electrons to form surface plasmon polaritons (SPPs) and uncovered a previously unexplored means to control SPPs in structures with periodically modulated carrier density. In these periodic structures, common SPPs with continuous dispersion are transformed into Bloch polaritons with attendant discrete bands separated by bandgaps. We explored directional Bloch polaritons and steered their propagation by dialing the proper gate voltage. Fourier analysis of the near-field images corroborates that this on-demand nano-optics functionality is rooted in the polaritonic band structure. Our programmable polaritonic platform paves the way for the much-sought benefits of on-the-chip photonic circuits.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC8104864PMC
http://dx.doi.org/10.1126/sciadv.abe8087DOI Listing

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