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Second-harmonic generation is described by the second-order nonlinear susceptibility χ(2) which, in the\udelectric-dipole approximation, requires a noncentrosymmetric medium. It is very challenging and of high\udtechnological interest to search whether it is possible to find away to break inversion symmetry in centrosymmetric\udcrystals in order to induce second-order nonlinearities. A new intriguing way to observe second-order nonlinear\udphenomena is strain. Here, we present a detailed analysis of the correlation between the strain and the χ(2) in\udboth centrosymmetric and noncentrosymmetric materials. We considered Si and SiC as test materials and we\udstudied different types of strain (tensile/compressive), in different directions (uniaxial/biaxial) and for different\udlight-polarization directions.We found which is the type of strain necessary in order to induce, tune, and enhance\udsecond-harmonic generation in different energy regions for centrosymmetric and noncentrosymmetric materials

Strain-designed strategy to induce and enhance second-harmonic generation in centrosymmetric and noncentrosymmetric materials