Chromophoric self-assembled multilayers. Organic superlattice approaches to thin-film nonlinear optical materials

Investigation of Second-Harmonic Generation and Molecular Orientation in Electrostatically Self-Assembled Thin Films

“…Devices made using this approach may have potential applications in electro-optic and frequency doubling waveguide devices [23][24][25][26][27][28][29][30][31][32]. A method to determine the second-order optical susceptibilities of thin films has been presented.…”

“…The fundamental laser power used is 75 mW. Using the fitted results of Equation (1), as an approximation, let us take n 2ω = n°2 ω = n e 2ω = 1.639, n ω = n°ω = n e ω = 1.488, refractive indices of the optical glass n g ω = 1.513, n g 2ω = 1.516 [29], and neglect the refractive index dispersion of air. Then, the fitted result gives r = χ 333 /χ 311 = 9.07 ± 0.45 after using the normalization method to eliminate I 2 2ω from Equation (1).…”

Artificially structured nonlinear optical and electro-optic materials

“…To achieve optimum molecular p, the orientation of each D-n-A unit should be fixed in nearly the same direction. Therefore, our approach involves the synthesis of a calix [4]arene with a frozen "cone" conformation by substitution at the lower rim with ethoxyethyl groups [2,3]. The upper rim of the calixarene was then functionalized for the incorporation of pyridyl units.…”

“…imine derivative of calix [4]stilbazole is based on the methodologies reported by Li, et d. [4]. A space filling model on the surface is shown in Figure 1 [s].…”

Supramolecular Architecture

“…24 The scanning tunneling microscope allows unprecedented resolution in imaging and direct-writing of nanostructures (B. Parkinson). Surface modification techniques using the STM tip include large voltage pulses to field emit atoms from the tip or disrupt the substrate, deposition of matter from solution or gas phase, and the use of van der Waals forces to move atoms and pattern layered materials.…”