No abstract

Inductive grid filters are metallic mesh structures, which reject long wavelengths but transmit short wavelengths. Our interest is in filters with the rejection cut-off at around 1mm. In this region the finite conductivity of metals must be considered. An extensive theoretical investigation is carried out by rigorous diffraction theory to determine the best choice of metal and the influence of the grid parameters on the spectral transmittance of the filter. Experimental results with nickel and gold grids fabricated on dielectric substrates are presented. Their fabrication process involves thin-film deposition, electron beam lithography, reactive ion etching and electroplating. The optical characterization results performed with spectrophotometry are in reasonable agreement with the theoretical predictions.

Design and manufacturing of diffractive optical elements (DOEs) are presented. Mass replication methods for DOEs are explained including UV-replication, micro-injection moulding and reel-to-reel production. Novel applications of diffractive optics including spectroscopic surface relief gratings, antireflection surfaces, infrared light rejection gratings, and light incoupling into thin waveguides are presented.

Inductive grid filters are metallic mesh structures, which reject long wavelengths but transmit short wavelengths. Our interest is in filters with the rejection cut-off at around lpm. In this region the finite conductivity of metals must be considered. An extensive theoretical investigation is carried out by rigorous diffraction theory to determine the best choice of metal and the influence of the grid parameters on the spectral transmittance of the filter. Experimental results with nickel and gold grids fabricated on dielectric substrates are presented. Their fabrication process involves thin-film deposition, electron beam lithography, reactive ion etching and electroplating. The optical characterization results performed with spectrophotometry are in reasonable agreement with the theoretical predictions.

Inductive grid filters are analyzed and designed with the aim to reject infrared radiation with wavelength larger than one micrometer and to transmit shorter wavelengths. Experimental results on nickel and gold grids are presented. The grids are fabricated by a process involving electron beam lithography, reactive ion etching, and electroplating. Optical characterization results were compared to the calculations.