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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 Esteban^2,3, Ainhoa Atxabal¹, Fèlix Casanova^1,3, Luis E. Hueso^1,3, Pablo Alonso-González⁴, Javier Aizpurua^2,5, Alexey Y. Nikitin^1,3, Saül Vélez^1,6, and Rainer Hillenbrand^1,3 — 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.