Eliminating Angular Dispersion in Microcavity by Employing Metamaterials With Hyperbolic Dispersion as Reflectors

Microcavity typically exhibits a blue shift of the resonance with the angle increasing, which may bring disadvantages in related applications. Herein, we propose a design concept of eliminating the angular dispersion in microcavity by employing metamaterials with hyperbolic dispersion as reflectors. By exploiting optimal constitutive parameters of the metamaterials, the reflection phase from the cavity upon both metamaterial reflectors increases drastically with the incident angle, and can nearly compensate the decrement of the phase accumulation inside the cavity for each angle. A microcavity without angular dispersion is therefore established, in which the metamaterials may be realized by employing metal-dielectric multilayered structures in practice.