Publications by authors named "Fabian Gaussmann"
Hyperbolic materials exhibit sub-diffractional, highly directional, volume-confined polariton modes. Here we report that hyperbolic phonon polaritons allow for a flat slab of hexagonal boron nitride to enable exciting near-field optical applications, including unusual imaging phenomenon (such as an enlarged reconstruction of investigated objects) and sub-diffractional focusing. Both the enlarged imaging and the super-resolution focusing are explained based on the volume-confined, wavelength dependent propagation angle of hyperbolic phonon polaritons.
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- Scattering-type scanning near-field optical microscopy (SNOM) provides a new approach to examining material properties, such as strain in crystals, at the nanoscale.
- The paper introduces a SNOM setup using a novel tunable broadband laser that enables optical analysis of gallium nitride (GaN) crystal structures at nanometer scales by exciting phonon resonance.
- The methodology allows for 2D visualization of stress-induced deviations in the GaN structure and quantifies stress levels through complex near-field spectra, demonstrating the technology's capability in analyzing crystal relaxation at nanometer resolution.