Three-Dimensional Photonic Metamaterials by Direct Laser Writing and Advanced Metallization Techniques

We have utilized a novel fabrication concept, i.e., direct laser writing in combination with chemical vapor deposition of silver, to realize three-dimensional metamaterials for optical frequencies. Some of the fabricated structures give rise to bianisotropy resulting in a cross-coupling of the electric and magnetic fields of an incident light wave. We have also presented two unit cell designs which show a negative refractive index at infrared frequencies.