# US 5,349,464 A · Nonlinear optical element > Agents: this data is available as JSON from the patentgrep API and MCP server — see https://patentgrep.com/llms.txt - Number: US 5,349,464 A - Document ID: US5349464A - Status: Granted - Kind: A - Application number: 07/941,730 - Filed: 1992-09-08 - Granted: 1994-09-20 - Earliest claimed: 1991-09-11 - Assignees: Mitsubishi Denki Kabushiki Kaisha - Inventors: Hajime Ishihara; Yoshinori Nomura; Kikuo Cho - Web page: https://patentgrep.com/patent/US5349464A ## CPC - G02F 1/3556: {Semiconductor materials, e.g. quantum wells} - B82Y 20/00: Nanooptics, e.g. quantum optics or photonic crystals - G02F: OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS - B82Y: SPECIFIC USES OR APPLICATIONS OF NANOSTRUCTURES; MEASUREMENT OR ANALYSIS OF NANOSTRUCTURES; MANUFACTURE OR TREATMENT OF NANOSTRUCTURES ## Abstract A nonlinear optical element for use in a light-light switching element or optical memory element of an optical information system which is controlled by a control light. The nonlinear optical element comprises an optical active layer having dielectric samples or semiconductor samples which cause a nonlinear optical effect, wherein their shapes and sizes are selected so that the electric field of exciton resonance energy in the sample increases in resonance with the size of the sample. ## Claims ### Claim 1 A nonlinear optical element for receiving an input light and a control light and producing an output light comprising: a plurality of quantum members of a predetermined shape which cause a nonlinear optical effect on the output light; and a plurality of barrier portions, each barrier portion separating a quantum member from another quantum member; wherein the size of each quantum member is selected to be within a specific range such that an internal electric field is maximized, the specific range having a center point approximately equal to a twice when the electric field is at a peak value and the specific range having a width being approximately equal to twice that of the width of a size range when the internal electric field is equal to or greater than half of the peak value. ### Claim 2 (depends on 1) A nonlinear optical element of claim 1 wherein said quantum members are comprised of dielectric samples. ### Claim 3 (depends on 1) A nonlinear optical element of claim 1 wherein said quantum members are comprised of semiconductor samples, ### Claim 4 (depends on 1) A nonlinear optical element of claim 1 wherein said quantum members are comprised of CuCl. ### Claim 5 (depends on 1) A nonlinear optical element of claim 1 wherein said quantum members are comprised of ZnSe. ### Claim 6 (depends on 1) A nonlinear optical element of claim 1 wherein each of the quantum, members is comprised of a thin film shape sample. ### Claim 7 (depends on 1) A nonlinear optical element of claim 1 wherein each of the quantum members is comprised of a sphere shape sample. ### Claim 8 (depends on 1) A nonlinear optical element of claim 1 wherein each of said quantum members is comprised of a bar shape sample. ### Claim 9 (depends on 1) A nonlinear optical element of claim 1 wherein each of the quantum members is comprised of a box shape sample. ### Claim 10 A nonlinear optical element comprising: a barrier portion; a plurality of quantum members embedded in the barrier portion and receiving an input light and a control light and producing an output light having a nonlinear optical effect, wherein the element includes an internal electric field which varies as a function of the size of each quantum member, each quantum member is selected to be within a predetermined size range having a center point approximately equal to a size at which the internal electric field is substantially at a pear value, and the range having a width being 2 times that of a half-peak width, the half-peak width being equal to a size range when the electric field is equal to or greater than half of peak value. ### Claim 11 A nonlinear optical element comprising: a barrier portion; a plurality of quantum members embedded in the barrier potion and receiving an input light and a control light and producing an output light having a nonlinear optical effect, wherein the element has an internal electric field which varies as a function of the size of each quantum member, and wherein the shape of each of the quantum members is such that there are two sizes in two different directions, a first size in a first direction is selected to maximize the internal electric field and a second size in a second direction is selected to quantum-mechanically confine the relative motion of excitons so that oscillator strength and binding energy of excitons in quantum material become larger than those of excitons in non-quantum natural material. ### Claim 12 A nonlinear optical element comprising: a barrier member; and a plurality of optical active members dispersed substantially evenly within the barrier member; wherein the optical active members cause a nonlinear optical effect, and each optical active member has a predetermined size so that an electric field of exciton resonance energy, which varies as function of the size of the optical active members, in the element is maximized, the size of each optical active member being within a range having a width which is twice that of the width of a size range when the internal electric field is at least as great as half of its peak value. ### Claim 13 (depends on 12) A nonlinear optical element of claim 12 wherein said optical active members are comprised of dielectric samples. ### Claim 14 (depends on 12) A nonlinear optical element of claim 12 wherein said optical active members are comprised of semiconductor samples. ### Claim 15 (depends on 12) A nonlinear optical element of claim 12 wherein said optical active members are comprised of CuCl. ### Claim 16 (depends on 12) A nonlinear optical element of claim 12 wherein said optical active members are comprised of ZnSe. ### Claim 17 (depends on 12) A nonlinear optical element of claim 12 wherein each of said optical active members is comprised of a thin film shape sample. ### Claim 18 (depends on 12) A nonlinear optical element of claim 12 wherein each of said optical active members is comprised of a sphere shape sample. ### Claim 19 (depends on 12) A nonlinear optical element of claim 12 wherein each of said optical active members is comprised of a bar shape sample. ### Claim 20 (depends on 12) A nonlinear optical element of claim 12 wherein each of said optical active members is comprised of a box shape sample. ### Claim 21 A nonlinear optical element comprising: a barrier portion; at least one Optical active member embedded within the barrier portion; and wherein the optical active member causes a nonlinear optical effect, wherein an internal electric field varies as a function of the size of the quantum member, the quantum member is selected to be within a predetermined size range having a center point approximately equal to a size at which the internal electric field is substantially at a peak value, and the range having a width being 2 times that of a width of a size range of the quantum member when the electric field is equal to or greater than half of the peak value. ### Claim 22 A nonlinear optical element comprising: a barrier portion; a plurality of optical active members dispersed substantially evenly within the substrate; and wherein the optical active members cause a nonlinear optical effect, and wherein the shape of each of the quantum members is such that there are two sizes in two different directions, a first size in a first direction is selected to maximize the internal electric field and a second size in a second direction is selected to quantum-mechanically confine the relative motion of excitons so that oscillator strength and binding energy of excitons in quantum material become larger than those of excitons in non-quantum natural material. ### Claim 23 A method for producing a non-linear optical element comprising the steps of: providing a barrier portion; embedding a plurality of optical active members substantially evenly within the barrier portion; wherein each barrier portion separates an optical active member from another optical active member; and selecting a size of each optical active member to be within a range having a width which is twice the width of a size range of an optical active member when an internal electric field is at least as great as half of its peak value. ### Claim 24 (depends on 23) A method as claimed in claim 23 wherein the step of selecting includes the step of selecting the shape of each optical active member such that each optical active member is in the shape of a bar. ### Claim 25 (depends on 23) A method as claimed in claim 23 wherein the step of selecting includes the step of selecting the shape of each optical active member such that each optical active member is in the shape of a box.