Berlin 2018 – wissenschaftliches Programm
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O: Fachverband Oberflächenphysik
O 30: Focus Session: Phonon Polaritons: Opportunities for THz Nanooptics I
O 30.3: Hauptvortrag
Dienstag, 13. März 2018, 11:30–12:00, HE 101
Boron nitride nanoresonators for phonon-enhanced molecular vibrational spectroscopy at the strong coupling limit — •Marta Autore1, Peining Li1, Irene Dolado1, Francisco J. Alfaro-Mozaz1, Ruben Esteban2,3, Ainhoa Atxabal1, Fèlix Casanova1,3, Luis E. Hueso1,3, Pablo Alonso-González4, Javier Aizpurua2,5, Alexey Y. Nikitin1,3, Saül Vélez1,6, and Rainer Hillenbrand1,3 — 1CIC nanoGUNE, San Sebastián, Spain — 2Donostia International Physics Center, San Sebastián, Spain — 3IKERBASQUE, Basque Foundation fro Science, Bilbao, Spain — 4Departamento de Física, Universidad de Oviedo, Spain — 5Centro de Física de Materiales, San Sebastián, Spain — 6Department of Materials, ETH Zürich, Switzerland
Surface enhanced infrared spectroscopy is a powerful strategy to increase the vibrational signature of molecules in FTIR spectroscopy, by means of the confined and enhanced field on the surface of plasmonic objects. Another option to enhance and confine IR light into subwavelength scale is to use phonon-polaritons (PhPs) in polar crystals or layered materials. In particular, the van der Waals material hexagonal boron nitride (hBN) hosts low-loss and high-momenta hyperbolic PhPs in the reststrahlen band (1360-1610 cm-1). We employ phononic antennas, hBN ribbons, to detect small amounts of organic molecules via IR transmission. The interaction between PhPs and molecular vibrations reaches the onset of the strong coupling regime. PhP nanoresonators thus could become a viable platform for sensing and active control of chemical reactivity and IR quantum cavity optics experiments.