Such tapered hyperbolic structures are excellent for broadband absorption; the incident light with various wavelengths can be effectively captured at different positions due to the tapered cross section [18]. However, the sophisticated fabrication processes of these arrays and their high optical losses ...
van der Waals crystalsα-MoO\n3Highly confined and low-loss hyperbolic phonon polaritons (HPhPs) sustained in van der Waals crystals exhibit outstanding potential to concentrate the long-wave electromagnetic fields deep into the subwavelength region. However, precise tuning on the HPhP propagation ...
In contrast to the origin of the modified electronic band structure in moiré superlattices, the polariton twisting configuration is attributed to the electromagnetic interaction of highly anisotropic hyperbolic polaritons in stacked α-MoO3 slabs. These results indicate twisted α-MoO3 to be a ...
摘要:Twisted two-dimensional bilayer materials exhibit many exotic electronic phenomena. Manipulating the ‘twist angle’ between the two layers enables fine control of the electronic band structure, resulting in magic-angle flat-band superconductivity1,2, the formation of moiré excitons3,4,5,6,7,8...
We experimentally observe tunable topological transitions from open (hyperbolic) to closed (elliptical) dispersion contours in bilayers of α-phase molybdenum trioxide (α-MoO3), arising when the rotation between the layers is at a photonic magic twist angle. These transitions are induced by ...
Highly confined and low-loss hyperbolic phonon polaritons (HPhPs) sustained in van der Waals crystals exhibit outstanding potential to concentrate the long-wave electromagnetic fields deep into the subwavelength region. However, precise tuning on the HPhP propagation characteristics is a critical challenge...
Here we consider the natural planar hyperbolic polar van der Waals (vdW) nanomaterials α-MoO3. Through experimental measurement, the complex permittivity of α-MoO3 is obtained, as shown in Figure 2. Figure 2: The relation between the (a) real and (b) imaginary part of the permittivity ...
Greatly Enhanced Radiative Transfer Enabled by Hyperbolic Phonon Polaritons inα‐MoO3 The study first determines the temperature‐dependent permittivity of α‐MoO3from polarized Fourier‐Transform Infrared (FTIR) spectroscopy measurements and then... Y Chen,MAS Pacheco,H Salihoglu,... - 《Adv.funct...
The emergence of a topological transition of the polaritonic dispersion in twisted bilayers of anisotropic van der Waals materials at a given twist angle—the photonic magic angle—results in the diffractionless propagation of polaritons with deep-subwav
Highly Confined and Tunable Hyperbolic Phonon Polaritons in Van Der Waals Semiconducting Transition Metal Oxides. Adv. Mater. 2018, 30, e1705318. [CrossRef] 18. De Castro, I.A.; Datta, R.S.; Ou, J.Z.; Castellanos-Gomez, A.; Sriram, S.; Daeneke, T.; Kalantar-Zadeh, K. ...