Fig. 4: Experimental polarization-dependent absorption spectra of α-MoO3.
From: Lithography-free IR polarization converters via orthogonal in-plane phonons in α-MoO3 flakes
Polarization-dependent absorption spectra of fabricated samples with different Ge and α-MoO3 thickness (tGe and tMO, respectively), schematically illustrated in Fig. 1d with thick Au, (a) S1, tGe = 0.42 μm and tMO = 0.15 μm, (b) S2, tGe = 0.42 μm and tMO = 0.95 μm, and (c) S3, tGe = 0.85 μm and tMO = 1.1 μm. Incident polarization (ϕi) is varied (bottom to top) from 0° to 180° in 22.5° revolution and illumination angle θ = 25° from FTIR. The green, red and blue arrows in (a) emphasize, respectively the OPhz, OPhx, and OPhy. The peaks observed in each sample are marked on Fig. 3a, b.
