Тип публикации: статья из журнала
Год издания: 2018
Идентификатор DOI: 10.1103/PhysRevB.97.024306
Аннотация: 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 moПоказать полностьюde 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 the Q factor 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 tunable Q factor.
Журнал: PHYSICAL REVIEW B
Выпуск журнала: Vol. 97, Is. 2
Номера страниц: 24306
ISSN журнала: 24699950
Место издания: COLLEGE PK
Издатель: AMER PHYSICAL SOC