Probing interfacial properties by optical second-harmonic generation

Partial Characterization of Different Mixtures of Solids by Measuring the Optical Nonlinear Response

“…Recently, there has been increased interest in using these interactions to characterize material properties. For example the characterization of surfaces using second harmonic generation (SHG) has been studied by Shen 13 and Marrucci et al 14 However, until recently, the use of SHG to quantify the polymorphic composition of a solid material had been limited to observing the formation of seed crystals in an otherwise liquid medium. 15 In 1999, Henson et al 16 published the first results where the polymorphic state of a solid material (octahydro-1,2,3,5,7-tetranitro-1,3,5,7-tetrazocine) was quantified by monitoring the intensity of the generated second harmonic.…”

Optical second-harmonic generation selection rules and resonances in buried oxide interfaces: the case of LaAlO_3/SrTiO_3

“…Second-order nonlinear optical spectroscopy, such as second-harmonic generation (SHG), is highly interfacespecific because it is electric-dipole forbidden in the bulk of centrosymmetric materials [22]. Thus, despite the large penetration depth of light in the material, only the interface (where the symmetry breaking occurs) can contribute significantly to the SHG signal.…”

Towards characterization and identification of solid state pharmaceutical mixtures through second harmonic generation

“…There has been increased interest in using these interactions to characterize material properties. Second harmonic generation (SHG) has been used by Shen8 and Marrucci et al9 in the characterization of surfaces. However, until recently the use of SHG to quantify the polymorph composition of a solid material had been limited to observing the formation of seed crystals in an otherwise liquid medium 10.…”