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The future missions for astrophysical studies in the submillimeter regionwill need detectors with very high sensitivity and large field of view.Bolometer arrays can fulfill these requirements over a very broad band. Wedescribe a technique that enables bolometer arrays that use quarter wavecavities to have a high spectral response over most of the submillimeter band.This technique is based on the addition on the front of the array of ananti-reflecting dielectric layer. The optimum parameters (layer thickness anddistance to the array) are determined by a 2D analytic code. This generalprinciple is applied to the case of the Herschel PACS bolometers (optimized forthe 60 - 210 micron band). As an example, we demonstrate experimentally that aPACS array covered by a 138 micron thick silicon layer can improve the spectralresponse by a factor 1.7 in the 450 micron band.

Enhancing the spectral response of filled bolometer arrays for submillimeter astronomy