# Helicity-selective Raman scattering from in-plane anisotropic α-MoO3

@article{Ali2021HelicityselectiveRS,
title={Helicity-selective Raman scattering from in-plane anisotropic $\alpha$-MoO3},
author={Shahzad Akhtar Ali and Abdullah Irfan and Aishani Mazumder and Sivacarendran Balendhran and Taimur Ahmed and Sumeet Walia and Ata Ulhaq},
journal={Applied Physics Letters},
year={2021}
}
Hyperbolic crystals like α-MoO3 can support large wavevectors and photon density as compared to the commonly used dielectric crystals, which makes them a highly desirable platform for compact photonic devices. The extreme anisotropy of the dielectric constant in these crystals is intricately linked with the anisotropic character of the phonons, which along with photon confinement leads to the rich physics of phonon polaritons. However, the chiral nature of phonons in these hyperbolic crystals…

## References

SHOWING 1-10 OF 47 REFERENCES
In-plane anisotropic and ultra-low-loss polaritons in a natural van der Waals crystal
Observation of the anisotropic propagation of polaritons along the surface of layered, semiconducting α-MoO3 confirms the existence of this phenomenon in natural materials.
Highly Confined and Tunable Hyperbolic Phonon Polaritons in Van Der Waals Semiconducting Transition Metal Oxides.
• Zebo Zheng, +8 authors N. Xu
• Materials Science, Medicine
• 2018
The results demonstrate α-MoO3 as a new platform for studying hyperbolic PhPs with tunability, which enable switchable mid-infrared nanophotonic devices.
Helicity-resolved Raman scattering of MoS₂, MoSe₂, WS₂, and WSe₂ atomic layers.
• Chemistry, Physics
Nano letters
• 2015
H helicity-resolved Raman scattering of the TMDC atomic layers is performed and new light is shed on the connection between photon helicity and valley polarization.
Routing a Chiral Raman Signal Based on Spin-Orbit Interaction of Light.
• Medicine, Physics
Physical review letters
• 2019
The spin-orbit interaction of light to the Raman scattering regime is extended and a new perspective for the remote readout of local optical chirality, helicity-related directional sorting, and quantum information processing is proposed.
Intervalley scattering by acoustic phonons in two-dimensional MoS2 revealed by double-resonance Raman spectroscopy
A multiple energy excitation Raman study in conjunction with density functional theory calculations that unveil the double-resonance Raman scattering process in monolayer and bulk MoS2 and highlights the underlying physics of intervalley scattering of electrons by acoustic phonons, which is essential for valley depolarization in MoS 2.
Sub-diffractional volume-confined polaritons in the natural hyperbolic material hexagonal boron nitride.
Three-dimensionally confined 'hyperbolic polaritons' in boron nitride nanocones that support four series (up to the seventh order) modes in two spectral bands are reported on.
Observation of chiral phonons
It is shown that phonons can exhibit intrinsic chirality in monolayer tungsten diselenide, and the chiral phonons are important for electron-phonon coupling in solids, phonon-driven topological states, and energy-efficient information processing.
Chiral phonons at high-symmetry points in monolayer hexagonal lattices.
• Physics, Medicine
Physical review letters
• 2015
The chiral phonons, together with phonon circular polarization, phonon pseudoangular momentum, selection rules, and valley phonon Hall effect will extend the basis for valley-based electronics and phononics applications in the future.
Polaritons in layered two-dimensional materials.
The emerging field of 2D material polaritonics and their hybrids provide enticing avenues for manipulating light-matter interactions across the visible, infrared to terahertz spectral ranges, with new optical control beyond what can be achieved using traditional bulk materials.
A mid-infrared biaxial hyperbolic van der Waals crystal
It is shown that thin flakes of a van der Waals crystal, α-MoO3, can support naturally in-plane hyperbolic polariton guided modes at mid-infrared frequencies without the need for patterning.