WIKIPEDIA dictionary defined the so-called meta-materials as artificial materials engineered to have properties that may not be found in nature. They are assemblies of multiple individual elements fashioned from conventional microscopic materials such as metals or plastics, but usually arranged in pre-designed periodic patterns. During the last two decades, many scientists in different fields have donated a lot of effort to tailor the novel properties of meta-materials, in particular the optical ones. The most specific feature of meta-material is the designable optical response at a certain frequency range. Different sub-wavelength structures produce various optical effects appearing at the range from several THz (far-infrared) to several eV (visible and UV). Therefore, a flexible spectrometer covering wide spectral range is very necessary for meta-material research.
As a pioneer FTIR spectrometer manufacture offering peak performance, Bruker has witnessed these exciting revoluti- ons of meta-material. For instance, in Ref.2, Prof. Giessen and his team had manufactured metallic split-ring-resonator (SRR) metamaterial nanoantennas using hole-mask colloi- dal nanolithography, and the resonance frequencies can be adjusted easily by changing SRR geometries. For each sample, the resonance frequency with its polarization dependence has been successfully measured using Bruker VERTEX 80 spectrometer attached with a Bruker HYPE- RION microscope. As examples shown in Fig.1(a)(b), the sample has clear enhancement in refl ectance at 2800 nm (3570 cm-1 ) for incident electric fi eld polarized parallel to the ring gap, and 1750 nm (5710 cm-1) for incident electric fi eld polarized orthogonal to the ring gap, respectively. The agreement between experiment and numerical simulation is extraordinarily good.
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