WO2004006009A1 - Logical optical device and procedure for generating a logical optical signal - Google Patents
Logical optical device and procedure for generating a logical optical signal Download PDFInfo
- Publication number
- WO2004006009A1 WO2004006009A1 PCT/IB2003/002482 IB0302482W WO2004006009A1 WO 2004006009 A1 WO2004006009 A1 WO 2004006009A1 IB 0302482 W IB0302482 W IB 0302482W WO 2004006009 A1 WO2004006009 A1 WO 2004006009A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- logical
- electric field
- optical
- molecules
- molecule
- Prior art date
Links
Classifications
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/355—Non-linear optics characterised by the materials used
- G02F1/361—Organic materials
- G02F1/3615—Organic materials containing polymers
- G02F1/3616—Organic materials containing polymers having the non-linear optical group in the main chain
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/35—Non-linear optics
- G02F1/3515—All-optical modulation, gating, switching, e.g. control of a light beam by another light beam
-
- G—PHYSICS
- G02—OPTICS
- 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
- G02F3/00—Optical logic elements; Optical bistable devices
Definitions
- the present invention relates to a logical optical device, as well as to a procedure for generating a logical optical signal .
- a logical port is a device capable of switching into one or more physical statuses based on an external pulse ⁇ , which for simplicity of the discussion we shall call gate signal, or simply gate.
- the variation of the refractive index perturbs the path of another light pulsing beam ⁇ with wavelength ⁇ , such that ⁇ ⁇ ⁇ ' and ⁇ ⁇ ⁇ ' . More in particular, the variation of the refractive index can be obtained using the Pockels effect, the Kerr effect and the effect of optical bi-refraction on molecules exhibiting a non-linear optical activity (NLO) of the second and third order .
- NLO non-linear optical activity
- ⁇ (2) is second order polarisation
- ⁇ (3) is third order polarisation
- ⁇ is first order molecular polarisation
- ⁇ is second order molecular polarisation
- ⁇ is third order molecular polarisation.
- the Pockels, Kerr and optical bi-refraction effects occur if the NLO molecules are immersed in an electrical field such as, for example, that generated in a Mach-Zender device, rather than by a separation of charges photo- generated in a photo-refractive material. From the discussion above it is evident that in order to obtain effects changing the refractive index it is necessary to introduce the molecules in an electric field, for example in a Mach-Zender device, or in any case to set up complex operating conditions to obtain the generation of the electric field.
- object of the present invention is that of solving the problems mentioned above by realising a logical optical device which should work without requiring further elements for the generation of the electric field.
- Another object of the present invention is that of realising a logical optical device which should be connected in series to other similar optical devices.
- a further object of the present invention is that of realising a logical optical device which should be connected to other similar optical devices to form logical ports or complex logical circuits.
- a further object of the present invention is that of realising a logical optical device which should be connected to other similar optical devices to form substantially planar and multilayer configurations.
- the claimed invention also comprises a procedure for generating a logical optical signal.
- Figure 1 is a schematic view of an exemplificative embodiment of the logical optical device according to the present invention
- FIG. 2 is a schematic view illustrating the operation of the present invention
- Figure 3 is a schematic view of another preferred embodiment of the invention.
- Figure 4 is a schematic view of yet another preferred embodiment of the invention.
- FIG. 5 shows an example of molecule intended to generate the electric field according to the teachings of the invention
- Figure 7 shows a molecular example of the invention according to the diagram of Figure 1;
- Device 10 consists of two molecules intended to generate the electric field (CG) , indicated with reference numeral 11, where the above molecules 11 are connected in series to a third molecule provided with non-linear optical properties (NLO) , in turn indicated with reference numeral 12.
- the molecules intended to generate the electric field are characterised in that they exhibit a separate-charge orbital representation of the excited state or fundamental status.
- the electric field is generated by the separation of charges produced or annulled by the passage to the excited state (HOMO ? LUMO) , caused by the absorption of the gate, in molecules connected in an ordered manner with the NLO molecule, as in Figure 1.
- Figure 5 illustrates an example of molecule intended to generate the electric field (CG) .
- Figure 6 illustrates an example of molecule exhibiting a non-linear optical effect (NLO)
- Figure 7 illustrates a molecular example of the invention according to the diagram of Figure 1.
- the gate consists of a light pulsing beam ⁇ ' and consequent wavelength ⁇ ' .
- the variation of the refractive index perturbs the path of another light pulsing beam ⁇ and consequent wavelength ⁇ , such that ⁇ ⁇ ⁇ ' and ⁇ ⁇ ⁇ ' .
- This other light beam where the device suitably inserted in the proper configuration, such as for example the typical configuration of a Mach-Zender, acts as signal.
- the device of the invention can work as a logical port NOT, without for this reason limiting the invention described for this use.
- the ordered system as represented in Figure 1, can be dispersed or anchored to a polymer transparent to radiations ⁇ and ⁇ ' .
- the different molecules can be differently connected in order to obtain a polymer consisting of the same molecules, as shown in Figure 3.
- the different molecules can be anchored to a surface and form a SAM (Self Assembling Multilayers), as shown in Figure 4.
- the inventive concepts described also allow the definition of a procedure for generating a logical optical signal.
- the procedure at least comprises the step of connecting two molecules intended to generate the electric field to a third molecule provided with non-linear optical properties, and the step of using a first light beam as optical gate signal for generating such electric field as to change the optical properties of the above third molecule with non-linear optics, so as to perturb the path of a second light beam acting as logical signal.
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- Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- General Physics & Mathematics (AREA)
- Optics & Photonics (AREA)
- Optical Modulation, Optical Deflection, Nonlinear Optics, Optical Demodulation, Optical Logic Elements (AREA)
Abstract
The object of the invention is a logical optical device comprising at least two molecules (11) intended to generate the electric field, connected to a third molecule (12) provided with non-linear optical properties, wherein a first light beam working as optical gate signal generates such electric field as to change the optical properties of the third molecule, so as to perturb the path of a second light beam working as logical signal. Another object of the invention is a procedure for generating a logical optical signal.
Description
TITLE
"LOGICAL OPTICAL DEVICE AND PROCEDURE FOR GENERATING A
LOGICAL OPTICAL SIGNAL"
FIELD OF THE INVENTION
The present invention relates to a logical optical device, as well as to a procedure for generating a logical optical signal .
BACKGROUND ART As known, a logical port is a device capable of switching into one or more physical statuses based on an external pulse ω, which for simplicity of the discussion we shall call gate signal, or simply gate.
Moreover, it is known that it is possible to change the refractive index of molecules exhibiting a non-linear optical activity.
The variation of the refractive index perturbs the path of another light pulsing beam ω with wavelength λ, such that ω ≠ ω' and λ ≠ λ' . More in particular, the variation of the refractive index can be obtained using the Pockels effect, the Kerr effect and the effect of optical bi-refraction on molecules exhibiting a non-linear optical activity (NLO) of the second and third order . Typically, the NLO activity appears as a polarisation,
induced by the electrical field of the incident light ω, characterised at the material level by the constants %{2 ) xjk (- ω, ω, 0) and
(-co, ω, 0, 0) and at the molecular level by the constants ijk (ω) , jijk (ω) and δα(ω) = αZ2 (ω) - 1/2 (αxx (ω) + otγγ (ω) ) .
As known, χ(2) is second order polarisation, χ(3) is third order polarisation, α is first order molecular polarisation, β is second order molecular polarisation and γ is third order molecular polarisation. As known, the Pockels, Kerr and optical bi-refraction effects occur if the NLO molecules are immersed in an electrical field such as, for example, that generated in a Mach-Zender device, rather than by a separation of charges photo- generated in a photo-refractive material. From the discussion above it is evident that in order to obtain effects changing the refractive index it is necessary to introduce the molecules in an electric field, for example in a Mach-Zender device, or in any case to set up complex operating conditions to obtain the generation of the electric field.
SUMMARY OF THE INVENTION
Therefore, object of the present invention is that of solving the problems mentioned above by realising a logical optical device which should work without requiring further elements for the generation of the electric field.
Another object of the present invention is that of realising a logical optical device which should be connected in series to other similar optical devices.
A further object of the present invention is that of realising a logical optical device which should be connected to other similar optical devices to form logical ports or complex logical circuits.
A further object of the present invention is that of realising a logical optical device which should be connected to other similar optical devices to form substantially planar and multilayer configurations.
Such objects are achieved, according to the present invention, by a logical optical device, according to claim 1, to which reference shall be made for shortness. Further features of the invention are illustrated in the dependent claims.
The claimed invention also comprises a procedure for generating a logical optical signal.
The invention is described in more detail hereinafter, by way of a non-limiting example, with reference to the attached drawings .
DESCRIPTION OF THE DRAWINGS
In such drawings :
Figure 1 is a schematic view of an exemplificative embodiment of the logical optical device according to the
present invention;
- Figure 2 is a schematic view illustrating the operation of the present invention;
Figure 3 is a schematic view of another preferred embodiment of the invention;
Figure 4 is a schematic view of yet another preferred embodiment of the invention;
- Figure 5 shows an example of molecule intended to generate the electric field according to the teachings of the invention;
- Figure 6 shows an example of molecule exhibiting a nonlinear optical effect, an effect to be used according to the teachings of the invention;
Figure 7 shows a molecular example of the invention according to the diagram of Figure 1;
- Figure 8 shows the molecule of Figure 6, in an excited state; and
- Figure 9 shows the molecule of Figure 7 in an excited state . DETAILED DESCRIPTION OF THE INVENTION
With initial reference to Figure 1, the logical optical device is globally indicated with reference numeral 10. Device 10 consists of two molecules intended to generate the electric field (CG) , indicated with reference numeral 11, where the above molecules 11 are connected in series to a
third molecule provided with non-linear optical properties (NLO) , in turn indicated with reference numeral 12. The molecules intended to generate the electric field are characterised in that they exhibit a separate-charge orbital representation of the excited state or fundamental status.
In such logical optical device 10, the electric field is generated by the separation of charges produced or annulled by the passage to the excited state (HOMO ? LUMO) , caused by the absorption of the gate, in molecules connected in an ordered manner with the NLO molecule, as in Figure 1.
By way of a non-exhaustive exemplification of the inventive concepts expressed herein, let's now consider Figure 5, which illustrates an example of molecule intended to generate the electric field (CG) . On the other hand, Figure 6 illustrates an example of molecule exhibiting a non-linear optical effect (NLO) , whereas Figure 7 illustrates a molecular example of the invention according to the diagram of Figure 1. To better understand the operation of the invention, reference shall now be made to Figure 2.
In the present invention, the gate consists of a light pulsing beam ω' and consequent wavelength λ' .
The variation of the refractive index perturbs the path of another light pulsing beam ω and consequent wavelength λ, such that ω ≠ ω' and λ ≠ λ' .
This other light beam, where the device suitably inserted in the proper configuration, such as for example the typical configuration of a Mach-Zender, acts as signal. It should also be noted that the device of the invention can work as a logical port NOT, without for this reason limiting the invention described for this use.
This means that more similar devices can be combined, according to the Boole algebraic rules, to form different logical ports, as well as more complex circuits. Of course, as the signal (radiation ω) must not be absorbed by molecule CG and by molecule NLO, in the same way the gate (radiation ω' ) must only be absorbed by molecule CG. To exemplify the present invention at a molecular level, Figure 8 illustrates the molecule of Figure 6 in an excited state, and Figure 9 illustrates the molecule of Figure 7, that is the logical optical port 10, in an excited state. Nothing prevents the use of different molecules NLO, different molecules CG, as well as different orders in the connection of the molecules and different radiations according to their function for the purposes of the present invention.
For this reason, the materials with which the system is realised can be different but it must meet the four requirements identified above. By way of an example of the multiple and considerable
possibilities offered by this finding, some variants of the invention are reported below.
The ordered system, as represented in Figure 1, can be dispersed or anchored to a polymer transparent to radiations ω and ω' .
The different molecules can be differently connected in order to obtain a polymer consisting of the same molecules, as shown in Figure 3. The different molecules can be anchored to a surface and form a SAM (Self Assembling Multilayers), as shown in Figure 4.
The inventive concepts described also allow the definition of a procedure for generating a logical optical signal. The procedure at least comprises the step of connecting two molecules intended to generate the electric field to a third molecule provided with non-linear optical properties, and the step of using a first light beam as optical gate signal for generating such electric field as to change the optical properties of the above third molecule with non-linear optics, so as to perturb the path of a second light beam acting as logical signal.
The present invention can be subject to several modifications and variants, all falling within the inventive concept expressed in the attached claims, whereas the technical details can change according to the requirements. In particular, in the above discussion reference is made to a
separate charge form in the excited state, but it should be noted that the system is absolutely valid also with systems with an inverted behaviour; in fact, what is more important is the variation between the two physical statuses rather than the absolute status.
Claims
1. Logical optical device, characterised in that it comprises at least two molecules intended to generate the electric field, where the above molecules intended to generate the electric field are connected to a third molecule provided with non-linear optical properties, wherein a first light beam, working as optical gate signal, generates such electric field as to modify the optical properties of said third molecule, so as to perturb the path of a second light beam working as logical signal.
2. Logical optical device according to claim 1 or 2, characterised in that said electric field is generated by the separation of charges produced or annulled by the passage to the excited state, caused by the absorption of the above optical gate signal, in the above molecules intended to generate the electric field and connected to said third nonlinear optical molecule.
3. Logical optical device according to claim 1, characterised in that said molecules intended to generate the electric field are connected in series to said third molecule provided with non-linear optical properties.
4. Logical optical device according to the previous claims, characterised in that said molecules intended to generate the electric field exhibit a separate-charge molecular orbital representation of the excited state or of the fundamental state.
5. Logical optical device according to claims 1 to 4, characterised in that said device is dispersed or anchored to a polymer transparent to radiations ω and ω' .
6. Logical optical device according to the previous claims, characterised in that said molecules are connected to one another in order to obtain a polymer consisting of the same molecules .
7. Logical optical device according to the previous claims, characterised in that said different molecules are anchored to a surface and a self-assembling multilayer structure is formed on said surface .
8. Procedure for generating a logical optical signal, characterised in that it comprises at least the step of connecting two molecules intended to generate the electric field to a third molecule provided with non-linear optical properties, and the step of using a first light beam as optical gate signal for generating such electric field as to change the optical properties of the above third molecule with non-linear optics, so as to perturb the path of a second light beam acting as logical signal.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| AU2003239259A AU2003239259A1 (en) | 2002-07-02 | 2003-06-26 | Logical optical device and procedure for generating a logical optical signal |
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| ITMI2002A001456 | 2002-07-02 | ||
| IT2002MI001456A ITMI20021456A1 (en) | 2002-07-02 | 2002-07-02 | OPTICAL LOGICAL DEVICE AND PROCEDURE FOR THE GENERATION OF AN OPTICAL LOGICAL SIGNAL |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| WO2004006009A1 true WO2004006009A1 (en) | 2004-01-15 |
Family
ID=11450128
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| PCT/IB2003/002482 WO2004006009A1 (en) | 2002-07-02 | 2003-06-26 | Logical optical device and procedure for generating a logical optical signal |
Country Status (3)
| Country | Link |
|---|---|
| AU (1) | AU2003239259A1 (en) |
| IT (1) | ITMI20021456A1 (en) |
| WO (1) | WO2004006009A1 (en) |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| EP0482920A2 (en) * | 1990-10-24 | 1992-04-29 | Kabushiki Kaisha Toshiba | Organic optical element |
| US5156774A (en) * | 1989-02-22 | 1992-10-20 | Flamel Technologies | Thiophene-related compounds active in nonlinear optics, materials and devices containing them |
| US5670090A (en) * | 1993-08-05 | 1997-09-23 | California Institute Of Technology | Nonlinear optical materials with reduced aromaticity and bond length alternation |
-
2002
- 2002-07-02 IT IT2002MI001456A patent/ITMI20021456A1/en unknown
-
2003
- 2003-06-26 WO PCT/IB2003/002482 patent/WO2004006009A1/en not_active Application Discontinuation
- 2003-06-26 AU AU2003239259A patent/AU2003239259A1/en not_active Abandoned
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5156774A (en) * | 1989-02-22 | 1992-10-20 | Flamel Technologies | Thiophene-related compounds active in nonlinear optics, materials and devices containing them |
| EP0482920A2 (en) * | 1990-10-24 | 1992-04-29 | Kabushiki Kaisha Toshiba | Organic optical element |
| US5670090A (en) * | 1993-08-05 | 1997-09-23 | California Institute Of Technology | Nonlinear optical materials with reduced aromaticity and bond length alternation |
Non-Patent Citations (2)
| Title |
|---|
| BELFIELD K D ET AL: "Synthesis of polyurethanes and polyimides for photorefractive applications", POLYMER, ELSEVIER SCIENCE PUBLISHERS B.V, GB, vol. 41, no. 13, June 2000 (2000-06-01), pages 5011 - 5020, XP004190974, ISSN: 0032-3861 * |
| YU LUPING ET AL: "Photorefractive polymers. 2. Structure design and property characterization", MACROMOLECULES;MACROMOLECULES APR 26 1993 PUBL BY ACS, WASHINGTON, DC, USA, vol. 26, no. 9, 26 April 1993 (1993-04-26), pages 2216 - 2221, XP002254992 * |
Also Published As
| Publication number | Publication date |
|---|---|
| ITMI20021456A0 (en) | 2002-07-02 |
| AU2003239259A1 (en) | 2004-01-23 |
| ITMI20021456A1 (en) | 2004-01-02 |
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