ONLINE - PhD Mid-term Seminar Series: Real-space observation of vibrational strong coupling between propagating phonon polaritons and organic molecules
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ONLINE - PhD Mid-term Seminar Series: Real-space observation of vibrational strong coupling between propagating phonon polaritons and organic molecules
CIC nanoGUNE Seminars
- Speaker
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Andrei Bylinkin, Nanooptics Group
- When
-
2020/10/05
13:00
- Place
- nanoGUNE online Webinar
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-
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**
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**Real-space observation of vibrational strong coupling between propagating
phonon polaritons and organic molecules**
Andrei Bylinkin
Nanooptics Group, CIC nanoGUNE
Phonon polaritons (PPs) in van der Waals (vdW) materials can strongly enhance
light-matter interactions at mid-infrared frequencies, owing to their extreme
infrared field confinement and long lifetimes. PPs thus bear potential for
achieving vibrational strong coupling (VSC) with molecules. Although the onset
of VSC has recently been observed spectroscopically with PP nanoresonators, no
experiments so far have resolved VSC in real space and with propagating modes
in unstructured layers. Here, we demonstrate by real-space nanoimaging that
VSC can be achieved between propagating PPs in thin vdW crystals (specifically
h-BN) and molecular vibrations in adjacent thin molecular layers. To that end,
we performed near-field polariton interferometry, showing that VSC leads to
the formation of a propagating hybrid mode with a pronounced anti-crossing
region in its dispersion, in which propagation with negative group velocity is
found. Numerical calculations predict VSC for nanometer-thin molecular layers
and PPs in few-layer vdW materials, which could make propagating PPs a
promising platform for ultra-sensitive on-chip spectroscopy and strong
coupling experiments.
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PhD Mid-term Seminar Series: Maria Barra & Andrei Bylinkin
Mon, Oct 5, 2020 11:00 AM - 12:30 PM (CEST)
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