Optical second-harmonic probe for silicon millimeter-wave circuits

Abstract
Electric field‐induced second‐harmonic generation (EFISHG) is shown to be a very powerful method for contactless sampling of high‐speed electrical signals on silicon millimeter‐wave devices. We present picosecond resolution EFISHG measurements of 2 GHz sinusoidal signals on a photoconductive silicon‐on‐sapphire antenna. We further demonstrate the application of the EFISHG technique for spatial mapping of free‐running microwave signals in silicon.

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