Electro-optical and nonlinear optical coefficients of ordered group IV semiconductor alloys

Miller’s delta δ14(2ω) of 0.0172 m2/C is found for β-SiC at 1.1 μm from the measured Pockels coefficient r41 [Appl. Phys. Lett. 59, 1938 (1991)]. Assuming δ is constant, we estimate that r41 for zincblende SiC, GeC, SiGe, SiSn, GeSn, and SnC is in the range 2.7 to 11.3 pm/V. For these binary materials, the optical second-harmonic coefficient d14(2ω) is estimated to be 30 to 1160 pm/V. Similar coefficients are expected for the ordered alloys GeSiC, SnSiC, SiGeSn, SnGeC, and SiGeCSn.