ONLINE - PhD Mid-term Seminar Series: Tuning the coupling strength between hexagonal boron nitride phonons and photonic modes in infrared microcavities
CIC nanoGUNE Seminars
- Speaker
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Maria Barra, Nanodevices Group
- When
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2020/10/05
13:00 - Place
- nanoGUNE online Webinar
- Add to calendar
-
iCal
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**Tuning the coupling strength between hexagonal boron nitride phonons and
photonic modes in infrared microcavities**
Maria Barra
Nanodevices Group, CIC nanoGUNE
Strong coupling between molecular vibrations and microcavity modes has been
recently demonstrated to modify physical and chemical properties of the
molecular material. Here, we study experimentally and theoretically the much
less explored coupling between lattice vibrations (phonons) and microcavity
modes. Embedding thin layers of the polar van der Waals crystal hexagonal
boron nitride (hBN) into classical microcavities (formed by two planar
mirrors), we demonstrate the evolution from weak to ultra-strong phonon-photon
coupling when the hBN thickness is increased from a few nanometers to a fully
filled the cavity. Remarkably, strong coupling is achieved for hBN layers as
thin as 10 nm, corresponding to 1/140 of the photon wavelength. On the other
hand, the ultra-strong coupling observed in fully filled cavities yields a
cavity polariton dispersion matching that of phonon polaritons in bulk hBN,
pointing out that the maximum light-matter coupling in a classical
microcavities is limited to the coupling strength between photons and bulk
materials. The tunable cavity phonon polaritons could become a versatile
platform for studying how the coupling strength between photons and phonons
may modify physical and chemical properties of polar crystals.
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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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**Please join my meeting from your computer, tablet or smartphone. **
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