By inducing two-photon absorption within the active layer of a proprietary silicon test chip, we demonstrate here solid-immersion-lens-enhanced nonlinear frequency-variation mapping of a 500-MHz ring oscillator circuit at 1560 nm. This work compares the performance of conventional single-photon linear methodologies against advanced two-photon alternatives and reports a maximum laser-induced change in the oscillator stage-delay of approximately 1 ps, and a signal injection resolution of 260 nm.

Topics
Integrated circuits, Inverters, Oscillators, Transistors, Photon absorption, Geometrical optics, Lenses, Solid immersion lens, Chemical elements, Microscopy
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© 2011 American Institute of Physics.
2011
American Institute of Physics
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