title: Compact air-cavity resonators within a metamaterial waveguide.
abstract: Recent advances in metamaterials have revealed the possibility of overcoming the diffraction limit, opening the door for high-density-integration photonic devices including waveguides and cavities. Here we investigate the condition required to have air cavities within a uniaxial metamaterial clad waveguide. Our work reveals that air-cavity sizes much smaller than the operating wavelength (D2h/λ3=1/(352×100)) are achievable under specific cladding material conditions, which could have a great impact on the miniaturization of electromagnetic devices. Harnessing metamaterials enables engineering of the required condition at a desired wavelength, unlike plasmonic cavities where the condition is reached at a specific wavelength.
authors.forename: Shaghik
authors.initials: S
authors.lastname: Atakaramians
authors.forename: Boris T
authors.initials: BT
authors.lastname: Kuhlmey