Twisted Pi-Electron System Chromophore Compounds with Very Large Molecular Hyperpolarizabilities and Related Compositions and Devices

Tobin Marks (Inventor)

Research output: Patent

Abstract

Organic Electro-Optic Chromophores with Superior Hyperpolarizability NU 2005-019 Inventors Hu Kang Tobin Marks* Abstract Northwestern researchers have developed a series of unconventional twisted ?-electron system electro-optic (EO) chromophores with ultra-large first hyperpolarizabilities. Molecule-based EO materials are of great interest for optoelectronic and photonic applications. EO response is governed by the second-order susceptibility tensor, which in turn is determined by contributions from both the net polar order and microscopic molecular first hyperpolarizability tensor (?). Synthetic efforts to maximize ? have generally employed conjugated ? donor-acceptor (D/A) end-capped systems of increasing complexity. This new technology utilizes a new structural model in order to create material with significantly greater ? in a direct synthetic scheme. They developed a direct route to synthesize organic molecular chromophores that have the largest known electric field-induced second harmonic generation nonresonance values. More specifically, they created zwitterionic twisted ?-electron systems joining D/A substituents with tunable hyperpolarizability and linear optical energy. These compounds exhibited high thermal stability (Td >300°C), zwitterionic ground states and extraordinary molecular hyperpolarizability properties. These unusually large values portend significant performance enhancements in optoelectronic and photonic devices utilizing molecular hyperpolarizability. The synthetic scheme employed provides wide molecular variation and property modification. Applications o High-speed optical communications o Integrated optics o Optical data processes and storage Advantages o Possesses largest known electric field-induced second harmonic generation nonresonance values o Tunable molecular hyperpolarizability o Linear optical energy o High thermal stability IP Status Issued US Patents No. 7,968,016 and 7,824,582
Original languageEnglish
Patent number7824582
StatePublished - Nov 2 2010

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