Organic nonlinear optical materials

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Organic materials are expected to have relatively strong nonlinear optical properties due to delocalized electrons at π−π* orbitals. This expectation explains the extensive search for better NLO materials among organic crystals.

## L-arginine maleate dihydrate

L-arginine is one of the essential amino acids widely distributed in biological substances. It forms a number of salts with organic and inorganic acids showing non-linear optical properties. L-Arginine maleate dihydrate (C6H14N4O2,C4H4O4,2H2O) is one of these L-arginine salts which is a complex of strongly basic amino acid, carboxylic acid and provides useful information in relation to molecular interaction in present-day biological systems and to prebiotic self-organisms.[1] It is also a nonlinear optical material with a second-harmonic generation efficiency 1.68 times that of KDP.[2] L-arginine maleate dihydrate crystals are grown from solution by solvent evaporation; they belong to the triclinic space group P1.

## L-methionine L-methioninium hydrogen maleate

L-methionine L-methioninium hydrogen maleate also belongs to the amino acid family. Crystals are grown by slow evaporation of an aqueous solution containing L-methionine and maleic acid, resulting in centimeter-large crystals of a non-centrosymmetric space group.[3] They were applied for second-harmonic generation (SHG) of an Physics:Nd:YAG laser (wavelength 1064 nm), and SHG efficiency equal to that of KDP has been obtained.

## References

1. ↑ S.L. Miller, E.L. Orgel, "The Origins of Life on the Earth", Prentice-Hall, New Jersey, 1974.
2. ↑ Mallik, Tapati; Kar, Tanusree; Bocelli, Gabriele; Musattib, Amos (March 2005). "Synthesis, crystal structure and solubility of C6H14N4O2,C4H4O4,2H2O". Science and Technology of Advanced Materials 6 (5): 508–512. doi:10.1016/j.stam.2005.01.001. Bibcode: 2005STAdM...6..508M.
3. ↑ Natarajan, Subramanian; Devi, Neelamagam Rajan; Dhas, Sathiya; Dhas, Martin Britto; Athimoolam, Shanmuganarayanan (July 2008). "Crystal growth and structure of L-methionine L-methioninium hydrogen maleate—a new NLO material". Science and Technology of Advanced Materials 9 (2). doi:10.1088/1468-6996/9/2/025012. PMID 27877987. Bibcode: 2008STAdM...9b5012N.

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