Mechanically robust amino acid crystals as fiber-optic transducers and wide bandpass filters for optical communication in the near-infrared

Organic crystals are emerging as mechanically compliant, light-weight and chemically versatile alternatives to the commonly used silica and polymer waveguides. However, the previously reported organic crystals were shown to be able to transmit visible light, whereas actual implementation in telecommunication devices requires transparency in the near-infrared spectral range. Here we demonstrate that single crystals of the amino acid L-threonine could be used as optical waveguides and filters with high mechanical and thermal robustness for transduction of signals in the telecommunications range. On their (00 $$(1) over bar) face, crystals of this material have an extraordinarily high Young's modulus (40.951.03GPa) and hardness (1.98 +/- 0.11GPa) for an organic crystal. First-principles density functional theory calculations, used in conjunction with analysis of the energy frameworks to correlate the structure with the anisotropy in the Young's modulus, showed that the high stiffness arises as a consequence of the strong charge-assisted hydrogen bonds between the zwitterions. The crystals have low optical loss in the O, E, S and C bands of the spectrum (1250-1600nm), while they effectively block infrared light below 1200nm. This property favors these and possibly other related organic crystals as all-organic fiber-optic waveguides and filters for transduction of information.

Automated summary

Organic crystals, such as single crystals of the amino acid L-threonine, show high mechanical and thermal robustness, making them suitable as optical waveguides and filters for transduction of signals in the telecommunications range. These crystals have high Young's modulus and hardness, indicating potential for use as all-organic fiber-optic waveguides and filters.