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We present the results of our project for the design and construction andon-sky test of silicon grisms. The fabrication of such devices is a complex andcritical process involving litho-masking, anisotropic etching and directbonding techniques. After the successful fabrication of the silicon grating, wehave optimized the bonding of the grating onto the hypotenuse of a siliconprism to get the final prototype. After some critical phases during theexperimentation a silicon grism with 363 grooves/mm and a blaze angle of 14degrees has been eventually fabricated. The application of an A/R coating onboth the surfaces has been the last step: this procedure is critical because ofthe groove geometry of the diffraction grating, whose performace might becompromised by the coating. Then, the grism was inserted in the filter wheel ofthe Near Infrared camera NICS, at the focal plane of the National GalileoTelescope (TNG), the 3.5 m Italian facility in the Canary Islands (E). Theresult of the on-sky tests are given in detail.

On-Sky Tests of an A/R Coated Silicon Grism on board NICS@TNG