Observing light trapped in graphene nanostructures
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Observing light trapped in graphene nanostructures
CIC nanoGUNE Seminars
- Speaker
-
Alexey Nikitin, Nanooptics Group
- When
-
2016/09/12
13:00
- Place
- nanoGUNE seminar room, Tolosa Hiribidea 76, Donostia - San Sebastian
- Add to calendar
-
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Graphene-based technologies enable extremely small optical nanodevices. We
will demonstrate how infrared light can be captured by nanostructures made of
graphene. This happens when light couples to charge oscillations in the
graphene. The resulting mixture of light and charge oscillations - called
plasmon - can be squeezed into record-small volumes - millions times smaller
than in conventional dielectric optical cavities. This process can be
visualized with the help of near-field optical microscopy. The theory helps to
explain the near-field images and recognize two different types of plasmons -
edge and sheet modes - propagating either along the sheet or along the sheet
edges. The edge plasmons are unique for their ability to channel
electromagnetic energy in one dimension. This opens new opportunities for
ultra-small and efficient photodetectors, sensors and other photonic and
optoelectronic nanodevices. The discussed results also provide novel insights
into the physics of near-field microscopy, which could be very useful for
interpreting near-field images of other light-matter interactions in two-
dimensional materials.