SEARCH Articles Figures Tables Methyl second-order material Non-linear optics, organic materials for second-order Nonlinear optical materials second-order effects Ordering materials Organic materials for second-order Photochromic materials second-order nonlinear optical Second order nonlinear optically active materials Second-order NLO materials Second-order current materials Second-order material coefficients Second-order non-linear optical materials Second-order optical nonlinear materials Second-order organic nonlinear optical materials