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Diffractive 11-phase-level Si microlens arrays are fabricated by a special method, i.e. part-etching. The method can increase focal length of diffractive microlens arrays. By using this method, the microlens arrays on the back side of the Si substrate and PtSi IR focal plane arrays(FPAs) on the front side of the same wafer are monolithically integrated together. The IR response characteristics of the integrated devices are improved greatly.
Diffractive 11-phase-level Si microlens arrays are fabricated by a special method, ie part-etching. The method can increase focal length of diffractive microlens arrays. By using this method, the microlens arrays on the back side of the Si substrate and PtSi IR focal plane arrays (FPAs) on the front side of the same wafer are monolithically integrated together. The IR response characteristics of the integrated devices are improved greatly.