Browse Prior Art Database

Bistable Circuit

IP.com Disclosure Number: IPCOM000098155D
Original Publication Date: 1960-Feb-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 23K

Publishing Venue

IBM

Related People

Cheroff, GC: AUTHOR

Abstract

A bistable circuit is provided which utilizes elements such as BaTiO(3) and ZnS. BaTiO(3) has the property of rotating the plane of polarized light when a voltage is applied to it. ZnS is capable of producing a photovoltage whose magnitude depends upon the wavelength and the angle at which the polarized radiation strikes the crystal.

This text was extracted from a PDF file.
At least one non-text object (such as an image or picture) has been suppressed.
This is the abbreviated version, containing approximately 100% of the total text.

Page 1 of 2

Bistable Circuit

A bistable circuit is provided which utilizes elements such as BaTiO(3) and ZnS. BaTiO(3) has the property of rotating the plane of polarized light when a voltage is applied to it. ZnS is capable of producing a photovoltage whose magnitude depends upon the wavelength and the angle at which the polarized radiation strikes the crystal.

Referring to the drawing, monochromatic plane polarized light lambda (1) of a given intensity and wavelength is incident upon the BaTiO(3) element I which causes a rotation of the plane of the light's polarization. The polarized light thus rotated strikes the ZnS crystal 2 at such an angle that zero photovoltage is produced at 2. Under these conditions essentially zero voltage is produced at point B and the device is in the 0 state.

Thereafter, a light information input signal lambda becomes incident upon 2 such that a photovoltage is produced. This photovoltage is amplified by amplifier 3 and fed back to 1. With this potential applied on 1 the plane of polarized light is further rotated such that the light lambda(1) is able to maintain the output of the crystal 2 when lambda is removed. Under these conditions the device is in the 1 state. Removal of lambda (1) returns the circuit to the 0 state. Alternatively, an electrical signal 4 applied to element 1 may be used to trigger the device into the 1 state.

1

Page 2 of 2

2

[This page contains 1 picture or other non-text object]