Hyperbolic phonon-polaritons in boron nitride for near-field optical imaging and focusing
RWTH Aachen University · Fraunhofer Institute for Laser Technology · +3 more institutions
Abstract
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. With advanced infrared nanoimaging techniques and state-of-art mid-infrared laser sources, we have succeeded in demonstrating and visualizing these unexpected…
Citation impact
- FWCI
- 73.38
- Percentile
- 100%
- References
- 44
Authors
9Topics & keywords
- Polariton
- Phonon
- Hexagonal boron nitride
- Optics
- Field (mathematics)
- Boron nitride
- Materials science
- Infrared