Giant non-linear susceptibility of hydrogenic donors in silicon and germanium.

ABSTRACT: Implicit summation is a technique for the conversion of sums over intermediate states in multiphoton absorption and the high-order susceptibility in hydrogen into simple integrals. Here, we derive the equivalent technique for hydrogenic impurities in multi-valley semiconductors. While the absorption has useful applications, it is primarily a loss process; conversely, the non-linear susceptibility is a crucial parameter for active photonic devices. For Si:P, we predict the hyperpolarizability ranges from χ ⁽³⁾/n _3D = 2.9 to 580 × 10^-38 m⁵/V² depending on the frequency, even while avoiding resonance. Using samples of a reasonable density, n _3D, and thickness, L, to produce third-harmonic generation

SUBMITTER: Le NH 

PROVIDER: S-EPMC6804565 | biostudies-literature | 2019

REPOSITORIES: biostudies-literature