ELFT HÍRADÓ

[Szeminárium koordinátor <sem-admin AT szfki.hu>]

SZFI SeminarNémeth GergelyWigner RCP SZFIReal-space observation of 
ultrastrong coupling between carbon nanotube plasmons and substrate 
phononsTuesday, 26 April 2022, 10:00, Bldg 1, auditorium, 
https://wigner-hu.zoom.us/j/86517517678?pwd=WWVhSE1KMzhWa20zWWw1Z0ZlL3J4UT09  
 Meeting ID: 865 1751 7678  Passcode: 650334Strong and ultrastrong coupling 
(SC and USC) between light and matter creates a plethora of new possibilities 
like induced transparency, polariton lasing, changing of the rate of chemical 
reactions, or enhanced sensitivity in infrared and Raman spectroscopy. 
However, the strong coupling is very challenging to achieve in the 
mid-infrared spectral range due to the low oscillator strengths of molecular 
vibrations and long wavelengths. The recently visualized Luttinger-liquid 
plasmons in carbon nanotubes feature very long plasmonic lifetimes and 
extreme field localization making them ideal candidates to realize strong or 
even ultrastrong coupling at infrared frequencies. We applied scanning 
near-field polariton interferometry to examine the interaction between 
propagating Luttinger-liquid plasmons in individual carbon nanotubes and 
surface phonon polaritons of silica and hexagonal boron nitride. We extracted 
the dispersion relation of the hybrid Luttinger-liquid plasmon–phonon 
polaritons (LPPhPs) and explained the observed phenomena by the classical 
coupled harmonic oscillator model. The dispersion shows pronounced mode 
splitting, and the obtained value for the normalized coupling strength shows 
that we reached the ultrastrong coupling regime with both native silica and 
hBN phonons. Our findings predict future applications to exploit the 
extraordinary properties of carbon nanotube plasmons, ranging from nanoscale 
plasmonic circuits to ultrasensitive molecular sensing. Minden 
érdeklődőt szívesen látunk! - Everyone is welcome to attend.Róbert 
Juhászsem-admin AT szfki.hu