Lithography-free IR polarization converters via orthogonal in-plane phonons in α-MoO3 flakes

• DOI: 10.1038/s41467-020-19499-x
• Publication Date: 2020-11-13T11:03:48Z
• Authors: Sina Abedini Dere...; Thomas G. Folland; Akshay A. Murthy; Xianglian Song; Ibrahim Tanriover; Vinayak P. Dravid; Joshua D. Caldwell; Koray Aydin
• Keywords: 0303 health sciences; 03 medical and health sciences; Science; Q; FOS: Physical sciences; Article; Physics - Optics; Optics (physics.optics)

Exploiting polaritons in natural vdW materials has been successful achieving extreme light confinement and low-loss optical devices enabling simplified device integration. Recently, α-MoO3 reported as a semiconducting biaxial material capable of sustaining naturally orthogonal in-plane phonon polariton modes IR. In this study, we investigate the polarization-dependent characteristics cavities formed using to extend degrees freedom design IR photonic components exploiting anisotropy material. Polarization-dependent absorption over 80% multilayer Fabry-Perot structure with is without need for nanoscale fabrication on α-MoO3. We observe coupling between phonons cavity resonances. Using cross-polarized reflectance spectroscopy show that strong birefringence results 15% total power converted into polarization respect incident wave. These findings can open new avenues quest filters low-loss, integrated planar photonics dictating control.