David N Beratan

50160630, May 14, 1991

Aug 14, 1989

7/393176

David N. Beratan - South Pasadena CA
Jose N. Onuchic - Sao Carlos, BR

The United States of America as represented by the Administrator of the
National Aeronautics and Space Administration - Washington DC

H01L 2928

357 8

An electronic shift register memory (20) at the molecular level is described. The memory elements are based on a chain of electron transfer molecules (22) and the information is shifted by photoinduced (26) electron transfer reactions. Thus, multi-step sequences of charge transfer reactions are used to move charge with high efficiency down a molecular chain. The device integrates compositions of the invention onto a VLSI substrate (36), providing an example of a "molecular electronic device" which may be fabricated. Three energy level schemes, molecular implementation of these schemes, optical excitation strategies, charge amplification strategies, and error correction strategies are described.

50626930, Nov 5, 1991

Feb 15, 1990

7/480385

David N. Beratan - South Pasadena CA
Joseph W. Perry - South Pasadena CA

The United States of America as represented by the Administrator of the
National Aeronautics and Administration - Washington DC

G02B 523
G02B 101
G02B 112

359241

A single material (not a multi-element structure) spatial light modulator (50) may be written to (30), as well as read out from (80), using light (20). The device has tailorable rise and hold times dependent on the composition and concentration of the molecular species used as the active components. The spatial resolution of this device is limited only by light diffraction as in volume holograms. The device may function as a two-dimensional mask (transmission or reflection) or as a three-dimensional volume holographic medium. This device, based on optically-induced electron transfer, is able to perform incoherent to coherent image conversion or wavelength conversion over a wide spectral range (ultraviolet, visible, or near-infrared regions).