Microwave seminar | 19 July 2021

Here, I investigate a heterostructure supporting embedded eigenstates (EEs) governed by phonon-polariton resonances in anisotropic quasi-2D MoO3 layers in the IR spectral range tuned with a relative rotation of the layers. I demonstrate that the structure can be tuned from an almost perfect reflector to an almost perfect absorber and back near the EE state. The approach paves the way to reconfigurable absorbers, quasi-coherent thermal emitters and other active photonic elements.

Main paper/arXiv, related to the seminar, and other references

1. A. Krasnok, D. Baranov, H. Li, M.-A. Miri, F. Monticone, and A. Alú, “Anomalies in light scattering,” Adv. Opt. Photonics, vol. 11, no. 4, p. 892, Dec. 2019, doi: 10.1364/AOP.11.000892.
2. G. Hu et al., “Topological polaritons and photonic magic angles in twisted α-MoO3 bilayers,” Nature, vol. 582, no. 7811, pp. 209–213, Jun. 2020, doi: 10.1038/s41586-020-2359-9.
3. D. C. Marinica, A. G. Borisov, and S. V. Shabanov, “Bound States in the Continuum in Photonics,” Phys. Rev. Lett., vol. 100, no. 18, p. 183902, May 2008, doi: 10.1103/PhysRevLett.100.183902.
4. N. C. Passler and A. Paarmann, “Generalized 4 × 4 matrix formalism for light propagation in anisotropic stratified media: study of surface phonon polaritons in polar dielectric heterostructures,” J. Opt. Soc. Am. B, vol. 34, no. 10, p. 2128, Oct. 2017, doi: 10.1364/JOSAB.34.002128.