Optical defect mode with tunable Q factor in a one-dimensional anisotropic photonic crystal
URI (for links/citations):https://link.aps.org/doi/10.1103/PhysRevB.97.024306
Тимофеев, И. В.
Maksimov, Dmitrii N.
Sadreev, Almas F.
Институт инженерной физики и радиоэлектроники
Кафедра теоретической физики и волновых явлений
Journal Name:PHYSICAL REVIEW B
Journal Quartile in Scopus:Q1
Journal Quartile in Web of Science:Q2
Bibliographic Citation:Тимофеев, И. В. Optical defect mode with tunable Q factor in a one-dimensional anisotropic photonic crystal [Текст] / И. В. Тимофеев, Dmitrii N. Maksimov, Almas F. Sadreev // PHYSICAL REVIEW B. — 2018. — Т. 97 (№ 2). — С. 024306
We consider a one-dimensional photonic crystal composed of alternating layers of isotropic and anisotropic dielectricmaterials.Such a system has different band structures for different polarizations of light.We demonstrate that if a defect layer is inserted into the structure, the crystal can support a polarized optical defect mode that is a bound state in the continuum (BIC). In the case of an anisotropic defect layer, by tilting the principle dielectric axes of the defect layer relative to those of the photonic crystal the BIC is transformed to a quasi-BIC.We derive an analytical expression for the decay rate of the resonance. An experimental setup with a liquid crystal defect layer is proposed to tune theQfactor of the quasi-BIC through applying an external electric field.We speculate that the setup provides a simple and robust platform for observing optical bound states in the continuum in the form of resonances with tunableQfactor