Highly Sensitive and Robust Ultrahigh-Q Nanocavity on a Multiheterostructure Photonic Crystal
arXiv:1804.01842
Abstract
An ultrahigh-Q hybrid cavity using a graded multiheterostructure and space modulation is designed in this work. Two high Q resonant modes exist in the cavity and follow separate confinement mechanisms. We have demonstrated an analytical method for designing the desired multiheterostructure. Space modulation was used to create a robust and sensitive nanocavity. The confinement mechanism and resonant characteristics of the resonant modes are studied using the finite difference time domain method. We have shown that the modes of the cavity are highly robust with respect to fabrication error. We have also demonstrated that the nanocavity can act as a highly sensitive refractive index sensor.
10 Pages, 10 Figures, 3 Tables