Amplitude- and phase-resolved nano-imaging and nano-spectroscopy of polaritons in liquid environment
arXiv:2010.06229 · doi:10.1021/acs.nanolett.0c04108
Abstract
Localized and propagating polaritons allow for highly sensitive analysis of (bio)chemical substances and processes. Nanoimaging of the polaritons evanescent fields allows for critically important experimental mode identification and for studying field confinement. Here we describe two setups for polariton nanoimaging and spectroscopy in liquid, which is an indispensable environment for (bio)chemical samples. We first demonstrate antenna mapping with a transflection infrared scattering-type scanning near-field optical microscope (s-SNOM), where the tip acts as a near-field scattering probe. We then demonstrate a total internal reflection (TIR) based setup, where the tip is both launching and probing ultra-confined polaritons in van der Waals materials, here phonon polaritons in hexagonal boron nitride (h-BN) flakes. This work lays the foundation for s-SNOM based polariton interferometry in liquid, which has wide application potential for in-situ studies of chemical reactions at the bare or functionalized surface of polaritonic materials, including (bio)chemical recognition analogous to the classical surface plasmon resonance spectroscopy.
References in corpus (9)
- Gate-tuning of graphene plasmons revealed by infrared nano-imaging
- Optical nano-imaging of gate-tuneable graphene plasmons
- Mid-Infrared Plasmonic Biosensing with Graphene
- Boron nitride nanoresonators for phonon-enhanced molecular vibrational spectroscopy at the strong coupling limit
- Ultrafast single-nanowire multi-terahertz spectroscopy with sub-cycle temporal resolution
- Refractive Index-Based Control of Hyperbolic Phonon-Polariton Propagation
- Molecular Sensing with Tunable Graphene Plasmons
- Graphene-Based Platform for Infrared Near-Field Nanospectroscopy of Water and Biological Materials in an Aqueous Environment
- Probing Mid-Infrared Phonon Polaritons in the Aqueous Phase