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Probing Mid-Infrared Phonon Polaritons in the Aqueous Phase | | Haomin Wang
; Eli Janzen
; Le Wang
; James H. Edgar
; Xiaoji G. Xu
; | | Date: |
18 Mar 2020 | | Abstract: | Phonon polaritons (PhPs), the collective phonon oscillations with hybridized
electromagnetic fields, concentrate optical fields in the mid-infrared
frequency range that matches the vibrational modes of molecules. The
utilization of PhPs holds the promise for chemical sensing tools and
polariton-enhanced nanospectroscopy. However, investigations and innovations on
PhPs in the aqueous phase remains stagnant, because of the lack of in situ
mid-infrared nano-imaging methods in water. Strong infrared absorption from
water prohibits optical delivery and detection in the mid-infrared for
scattering-type near-field microscopy. Here, we present our solution: the
detection of photothermal responses caused by the excitation of PhPs by liquid
phase peak force infrared (LiPFIR) microscopy. Characteristic interference
fringes of PhPs in 10B isotope-enriched h-BN were measured in the aqueous phase
and their dispersion relationship extracted. LiPFIR enables the measurement of
mid-infrared PhPs in the fluid phase, opening possibilities, and facilitating
the development of mid-IR phonon polaritonics in water. | | Source: | arXiv, 2003.8463 | | Services: | Forum | Review | PDF | Favorites | |
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