Various lacunary polyoxometalates: cluster molecule crystals as new designable inorganic, nonlinear materials for the second harmonic generation

Summary form only given. We report on the large inorganic, design-flexible, cluster-molecule materials, lacunary polyoxometalates. We found that these molecules have higher optical nonlinearity than KDP on using the powder second-harmonic-generation (SHG) method. We will also explain the basic criteria to design the high nonlinearity.