![]() In this way, we can easily obtain ultra-fine single-crystalline DAST NWs with good NLO properties. We separate crystal seeds preparation and growth process by substrate-supported rapid evaporation crystallization (SSREC) and saturated vapor cultivation respectively. In this study, we develop an environmentally friendly one-drop self-assembling method for DAST NWs fabrication. Although many organic materials have been successfully employed to synthesize second harmonic generation (SHG) active 1D crystalline nanostructures, their second-order susceptibilities are still far lower than those of organic NLO crystals with large dipole moments. For organic materials, the self-assembly driving forces can originate from interactions such as coordination bonding, aromatic π−π stacking, hydrogen bonding, Van der Waals forces, and electrostatic interactions. Meanwhile, self-assembly, a bottom-up technique, is becoming a powerful method for fabricating micro/nanoscale one-dimensional (1D) structures and is promising for the production of miniaturized integrated electronic, optoelectronic, and photonic devices. ![]() However, the applications of DAST crystals are limited due to their deficient quality and the difficulty of fabricating DAST crystal optical waveguides using the traditional “top-down” approach. Organic ionic 4-N, N-dimethylamino-4′-N′-methyl-stilbazolium tosylate (DAST) crystals are recognized as benchmark organic NLO crystals due to their electro-optic coefficients γ 11 = 55 ± 80pm/V at 1315 nm , high-NLO susceptibilities χ (2)(−2 ω, ω, ω) = 580 ± 30pm/V at 1535 nm, and low-dielectric constants (5.2, 10 3–10 5 kHz) and consequently are researched intensively. Second-order organic nonlinear optical (NLO) materials have ultra-fast electro-optic response times as well as very large bandwidths and NLO coefficients, and therefore, have been intensively researched for a wide range of applications related to electrical/optical signal transduction, optical switching, phased-array radar, analogue/digital conversion, terahertz signal generation, and digital signal processing.
0 Comments
Leave a Reply. |
AuthorWrite something about yourself. No need to be fancy, just an overview. ArchivesCategories |