Aplanarfour-portchanneldropfilterinthe three-dimensionalwoodpilephotoniccrystal DanielStieler, 1,*AnthonyBarsic, 1RanaBiswas, 1,2GaryTuttle, 1andKai-MingHo 2 1AmesLaboratoryandDepartmentofElectricalandComputerEngineeringandMicroelectronicsResearchCenter, IowaStat