Second Harmonic Generation from Phononic Epsilon-Near-Zero Berreman Modes in Ultrathin Polar Crystal Films

Abstract

Immense optical field enhancement was predicted to occur for the Berreman mode in ultrathin films at frequencies in the vicinity of epsilon near zero (ENZ). Here, we report the first experimental proof of this prediction in the mid-infrared by probing the resonantly enhanced second harmonic generation (SHG) at the longitudinal optic phonon frequency from a deeply subwavelength-thin aluminum nitride (AlN) film. Employing a transfer matrix formalism, we show that the field enhancement is completely localized inside the AlN layer, revealing that the observed SHG signal of the Berreman mode is solely generated in the AlN film. Our results demonstrate that ENZ Berreman modes in intrinsically low-loss polar dielectric crystals constitute a promising platform for nonlinear nanophotonic applications.

References in corpus (16)

• How to face the loss in plasmonics and metamaterials
• Sub-diffractional, volume-confined polaritons in a natural hyperbolic material: hexagonal boron nitride
• Hyperbolic phonon-polaritons in boron nitride for near-field optical imaging
• Subdiffractional focusing and guiding of polaritonic rays in a natural hyperbolic material
• Ultra-low-loss Polaritons in Isotopically Pure Materials: A New Approach
• Epsilon-Near-Zero Al-Doped ZnO for Ultrafast Switching at Telecom Wavelengths: Outpacing the Traditional Amplitude-Bandwidth Trade-Off
• Boron nitride nanoresonators for phonon-enhanced molecular vibrational spectroscopy at the strong coupling limit
• Generalized 4 $\times$ 4 Matrix Formalism for Light Propagation in Anisotropic Stratified Media: Study of Surface Phonon Polaritons in Polar Dielectric Heterostructures
• Perfect Absorption in Ultrathin Epsilon-Near-Zero Metamaterials Induced by Fast-Wave Non-Radiative Modes
• Surface plasmon Fourier optics
• Enhanced third harmonic generation from the epsilon-near-zero modes of ultrathin films
• Directional perfect absorption using deep subwavelength low permittivity films
• Singularity-driven Second and Third Harmonic Generation in a ε-near-zero nanolayer
• Strong Coupling of Epsilon-Near-Zero Phonon Polaritons in Polar Dielectric Heterostructures
• Effects of Crystal Anisotropy on Optical Phonon Resonances in the Mid-Infrared Second Harmonic Response of SiC
• Second Harmonic Generation from Critically Coupled Surface Phonon Polaritons

Cited by in corpus (14)

• Perspective: Phonon polaritons for infrared optoelectronics
• Layer-Resolved Absorption of Light in Arbitrarily Anisotropic Heterostructures
• In-plane hyperbolic polariton tuners in terahertz and long-wave infrared regimes
• Surface Polariton-Like s-Polarized Waveguide Modes in Switchable Dielectric Thin-Films on Polar Crystals
• Nonlocal Scattering Matrix Description of Anisotropic Polar Heterostructures
• Tailoring Infrared Absorption and Thermal Emission with Ultrathin-film Interferences in Epsilon-Near-Zero Media
• Enhanced beam shifts mediated by Bound States in Continuum
• Dependence of the Nonlinear-Optical Response of Materials on their Linear $\epsilon$ and $\mu$
• Five-channel frequency-division multiplexing using low-loss epsilon-near-zero metamaterial waveguide
• Exploring the route from leaky Berreman modes to bound states in continuum
• Hybrid Epsilon-Near-Zero Modes of Photonic Gap Antennas
• Second Harmonic Generation from Grating-Coupled Hybrid Plasmon-Phonon Polaritons
• Experimental observation of Berreman modes in uniaxial anisotropic nanoporous alumina film on aluminium substrate
• Leveraging Epsilon Near Zero phenomena for on-chip photonic modulation