Extremely non-degenerate two photon absorption optical sensing method, apparatus and applications

摘要

An extremely non-degenerate two photon absorption (END-2PA) method and apparatus provide for irradiating a semiconductor material substrate simultaneously with two photons each of different energy less than a bandgap energy of the semiconductor material substrate but in an aggregate greater than the bandgap energy of the semiconductor material substrate. A ratio of a higher energy photon energy to a lower energy photon energy is at least about 3.0. Alternatively, or as an adjunct, the higher energy photon has an energy at least about 75% of the bandgap energy and the lower energy photon has an energy no greater than about 25% of the bandgap energy.

主权项

1. A method, comprising:
providing a semiconductor material substrate having a bandgap energy; and irradiating the semiconductor material substrate simultaneously with two photons of different energy each individually less than the bandgap energy, but in an aggregate greater than the bandgap energy, where: a higher energy photon has an energy at least about 75 percent of the bandgap energy; and a lower energy photon has an energy no greater than about 25 percent of the bandgap energy.