Abstract
A new geometry for an avalanche photodiode is presented which allows both a large gain‐bandwidth product (300 GHz) at high frequencies and a high quantum efficiency in the 0.4–1‐μm wavelength range. It is a thin‐silicon‐film double‐mesa‐shaped structure, which utilizes light reflection at the back metallic contact. The advantages of such a structure are discussed, and the fabrication steps and typical electrical and optical data of these diodes are presented.

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