CN115128881B - Multifunctional photoelectric logic gate based on single light source and single detector - Google Patents

Multifunctional photoelectric logic gate based on single light source and single detector Download PDF

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CN115128881B
CN115128881B CN202210661152.0A CN202210661152A CN115128881B CN 115128881 B CN115128881 B CN 115128881B CN 202210661152 A CN202210661152 A CN 202210661152A CN 115128881 B CN115128881 B CN 115128881B
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gate
polarized light
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CN115128881A (en
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曹国洋
李孝峰
桑田
吴绍龙
王跃科
黄杨
边志浩
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Suzhou University
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    • 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
    • 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
    • G02F1/01—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 for the control of the intensity, phase, polarisation or colour 
    • G02F1/0136—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 for the control of the intensity, phase, polarisation or colour  for the control of polarisation, e.g. state of polarisation [SOP] control, polarisation scrambling, TE-TM mode conversion or separation

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Abstract

The invention discloses a multifunctional photoelectric logic gate based on a single light source and a single detector, and belongs to the field of photoelectric information. The photoelectric logic gate based on the single light source and the single detector provided by the invention has the advantages that bipolar current response is realized by regulating and controlling the polarization direction of light, logic judgment is further carried out by the polarity of signal current, and the AND, OR, NOT and NOT basic logic functions can be completed by realizing a single architecture, so that the space and the functional integration level of the photoelectric logic gate are greatly improved, the complexity of a device is reduced, the photoelectric logic gate is strongly promoted to develop towards the directions of high integration, high precision, low power consumption and multiple functions, and the photoelectric logic gate based on the single light source and the single detector provided by the invention carries out logic judgment by the polarity rather than the magnitude of the signal current, the on-off ratio of the photoelectric logic gate tends to infinity, and the accuracy of logic judgment is ensured. The invention realizes multiple logic functions by utilizing the polarization beam splitting of the same light source, and the operation of the photoelectric logic gate is not influenced by the limited fluctuation of the power of the light source.

Description

Multifunctional photoelectric logic gate based on single light source and single detector
Technical Field
The invention relates to a multifunctional photoelectric logic gate based on a single light source and a single detector, and belongs to the field of photoelectric information.
Background
With the explosive growth of data volume and data processing demands and the continuous extension of chip molar period, the full-electronic logic gate chip is more and more difficult to meet the demands of future social development. Therefore, the development and the development of a novel logic operation platform with faster calculation speed and lower power consumption have great scientific significance and application value. The seamless integration of photons and electrons on the nanoscale into a single platform is considered a next generation technology [ Cahoon J f. Letting photons out of the gate [ J ]. Nature Nanotechnology,2017,12 (10): 938-939 ].
Optoelectric logic gates have been attracting attention in recent years as one of the core components. And the photoelectric logic gate has wide application prospect in the aspects of calculation, interconnection, communication, novel diagnosis and the like [ Chen H, liu H, zhang Z, et al, nanostructured photodetectors: from ultraviolet to terahertz [ J ] Advanced Materials,2016,28 (3): 403-433 ]. The photoelectric logic gate is basically a serial-parallel combined device of two or more detectors and realizes a single photoelectric logic function under the irradiation of light with single or two wavelengths [ Kim J, lee H C, kim K H, et al photon-triggered nanowire transistors [ J ]. Nature nanotechnology,2017,12 (10): 963-968; li M, xu J, zhu K, et al, the fabrication of a self-powered CuInS 2/TiO 2heterojunction photodetector and its application in visible light communication with ultraviolet light encryption[J ]. Journal of Materials Chemistry C,2021,9 (41): 14613-14622; ding L, liu N, li L, et al graphic-skin heat-coordinated and nanoamorphous-surface-state controlled pseudo-negative-photoconductivity of tiny SnO2 nanoparticles [ J ]. Advanced Materials,2015,27 (23): 3525-3532; gao Yihua, ding Longwei, liu Nishuang, etc. A photoelectric logic gate based on tin dioxide nanoparticles and its preparation method are described in CN104849940A [ P.2015 ].
However, the implementation of only one logic function by one device architecture is obviously disadvantageous for multifunctional integrated operations. Although researchers have implemented single device based multifunctional logic gates [ Prasad M, roy s.optoelectronics logic gates based on photovoltaic response of bacteriorhodopsin protein thin films [ C ]//2012 International Conference on Fiber Optics and Photonics (PHOTONICS) ], IEEE 2012:1-3 ], using the superposition of the photovoltaic device's photoelectric response, the logic functions remain incomplete. The device is limited by unipolar signals, the logic function is changed by setting different thresholds, and the different logic functions are realized by the different thresholds, so that on one hand, the logic judgment precision is lower due to fluctuation of input power, and on the other hand, the signals cannot be kept [ Gao Yihua, ding Longwei, liu Nishuang, and the like ] due to severe attenuation, the photoelectric logic gate based on tin dioxide nano particles and the preparation method thereof are disclosed in CN104849940A [ P ].2015 ].
Recently, researchers have utilized spectral bipolar response of back-to-back PN structures to realize single device based multifunctional optoelectric logic gates [ Kim W, kim H, yoo T J, et al Perovski multifunctional logic gates via bipolar photoresponse of single photodetector [ J ]. Nature communications,2022,13 (1): 1-8.], however, on the one hand, this back-to-back configuration (i.e., p+ -i-n-p-p+) is based on two vertically stacked perovskite diodes, requiring complex energy band engineering and doping processes, and the fabrication process is complex and difficult; on the other hand, when the pixel unit size of the detection device is reduced from hundreds of micrometers to tens of micrometers, the response performance is fast attenuated, and the high-space integration of the device is not facilitated. In addition, the device requires power modulation using two wavelength light sources to implement multi-function logic, resulting in a more complex optical end.
Therefore, the novel multifunctional photoelectric logic gate based on a single light source and a single device, which has simple structure, small size and high performance, has great value and significance.
Disclosure of Invention
In order to solve the problems of the conventional single-device-based multifunctional logic gate, the invention provides the single-light-source single-detector-based multifunctional photoelectric logic gate, bipolar current response is realized by regulating and controlling the polarization direction of light, logic judgment is further carried out by the polarity of signal current, and five basic logic functions of AND, OR, NOT and NOT are realized by realizing a single architecture, so that the space and the functional integration level of the photoelectric logic gate are greatly improved, the complexity of devices is reduced, and the photoelectric logic gate is strongly pushed to develop towards the directions of high integration, high precision, low power consumption and multiple functions.
A first object of the present application is to provide a multifunctional optoelectronic logic gate based on a single light source and a single detector, the multifunctional optoelectronic logic gate comprising: linear polarized light source, first polarization beam splitter PBS 1 An electrically modulated half wave plate HWP, a second polarizing beam splitter PBS 2 50% beam splitter BS 1 And BS 2 Three total reflection mirrors, four optical on-off controllers, a beam combiner and a bipolar self-driven polarization photodetector;
linearly polarized lightThe light beam emitted by the source passes through the first polarization beam splitter PBS 1 The wave is divided into P wave and S wave; p wave passes through a second polarization beam splitter PBS after the polarization direction of the P wave is regulated by an electric modulation half wave plate HWP 2 The light beam is decomposed into P wave and S wave which are respectively called TM wave and TE wave, and the TE wave direction is changed through a total reflection mirror so that the TE wave and the TM wave continue to propagate in the same direction;
the TM wave and TE wave respectively pass through 50% to 50% of beam splitter BS 1 And BS 2 Is decomposed to obtain four beams of light, respectively called TM 1 、TM 2 、TE 1 、TE 2 The directions of the two beams of light are changed through a total reflection mirror respectively, so that the four beams of light continue to propagate along the same direction;
TM 1 、TM 2 、TE 1 、TE 2 after each beam passes through an on-off controller, a beam combiner synthesizes a beam of light to irradiate the bipolar self-driven polarization photodetector;
the multifunctional photoelectric logic gate regulates and controls the polarization direction through electrically modulating the half wave plate HWP, and combines the on-off of four optical on-off controllers to realize the AND, OR, NOT AND or NOT five basic logic functions.
Optionally, the bipolar self-driven polarization photodetector is a detector capable of realizing opposite positive and negative response currents of the device under TE/TM polarized light irradiation without an external bias.
Optionally, the bipolar self-driven polarization photodetector is a nested grating structure, and includes: the silicon dioxide/silicon substrate, the metal nanowire grating array arranged on the substrate, the semiconductor layer coated outside the metal nanowire grating array and the transparent conductive layer coated outside the semiconductor layer.
Optionally, in the metal nanowire grating array, the metal nanowire material is silver, and the cross section is rectangular or square; the side length of the metal nanowire is 55+/-5 nm, the length is 3-10 mu m, and the period is 750nm.
Optionally, the semiconductor layer is made of perovskite material, and the shell thickness of the semiconductor layer is set to 94+/-5 nm.
Optionally, the transparent conductive layer is prepared from transparent conductive oxide ITO, and the thickness is 80nm.
Optionally, the metal nanowires at one end of the metal nanowire grating array are connected through a section of metal nanowire with the width of 50+/-20 nm; the transparent conductive layer at the other end is correspondingly connected.
Optionally, one end of the metal nanowire grating array connected with the transparent conducting layer is connected with a conducting wire to serve as one end electrode, the other end of the metal nanowire grating array connected with the transparent conducting layer is connected with the conducting wire to serve as the other end electrode, and the conducting wires led out from the two ends of the metal nanowire grating array are connected with each other by an ammeter or connected with a load.
Optionally, the linearly polarized light source is a single visible light laser, and the wavelength range of the visible light laser is 440-550 nm.
A second object of the present application is to provide a method for implementing a logic function by using the multifunctional photoelectric logic gate based on a single light source and a single detector, where the method includes:
determining the ratio of photocurrents of the bipolar self-driven polarized light detector at equal power of TM and TE polarized light incidence, assuming-k (where k > 0), then:
when the logic function to be realized is AND gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be in the range of 0.6k to 0.9k, TE is 1 And TE (TE) 2 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 1 And TM 2 The logic light input is defined as two paths of logic light input, the response current of the bipolar self-driven polarization photodetector is defined as one path of logic electric output, and the logic function of the AND gate can be realized;
when the logic function to be implemented is OR gate logic, the electrically modulated half-wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be in the range of 0.6k to 0.9k, TE is 1 The corresponding optical on-off controller is set to be in an on state to enable TE 2 The corresponding optical on-off controller is set to be in an off state, and TM is set to be in an off state 1 And TM 2 The logic optical input is defined as two paths, and the response current of the bipolar self-driven polarization photodetector is defined as one path of logic electric output, so that the OR gate logic function can be realized.
The logic function to be implemented is NAND gate logicWhen editing, the electric modulation half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensity of linear polarized light after passing through it be between 1.2k and 1.8k, and TM is added 1 And TM 2 The corresponding optical on-off controller is set to be in an on state to enable TE 1 And TE (TE) 2 The dual-polarity self-driven polarized light detector is defined as two paths of logic light input, and the response current of the dual-polarity self-driven polarized light detector is defined as one path of logic electric output, so that the NAND gate logic function can be realized;
when the logic function to be realized is NOR gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be 1.2k to 1.8k, and TM is added 1 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 2 The corresponding optical on-off controller is set to be in an off state to enable TE 1 And TE (TE) 2 The bipolar self-driven polarized light detector is defined as two paths of logic light input, and the response current of the bipolar self-driven polarized light detector is defined as one path of logic electric output, so that the NOR gate logic function can be realized;
when the logic function to be realized is NOT gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be 1.2k to 1.8k, and TM is used for regulating the output of the light source 1 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 2 The corresponding optical on-off controller is set to be in an off state to enable TE 1 The corresponding optical on-off controller is set to be in an off state to enable TE 2 The logic light input is defined as one path, and the response current of the bipolar self-driven polarized light detector is defined as one path of logic electric output, so that the NOT gate logic function can be realized.
Alternatively, the method would be to TM 1 、TM 2 、TE 1 、TE 2 Two or one of the two paths is used as logic light input, the on state of the light input is defined as logic 1, and the off state is defined as logic 0; the response current signal of the bipolar self-driven polarization photodetector is used as logic electric output, and the response current signal is defined to be output as logic 1 when the response current is positive value, and is output as logic 0 when the response current is negative value.
The invention has the beneficial effects that:
the photoelectric logic gate with the novel structure has the advantages that bipolar current response is achieved through regulating and controlling the polarization direction of light, logic judgment is conducted through the polarity of signal current, and the AND, OR, NOT and NOT five basic logic functions can be achieved through a single architecture, so that the space and the functional integration level of the photoelectric logic gate are greatly improved, the complexity of a device is reduced, and the photoelectric logic gate is strongly pushed to develop towards the high integration, high precision, low power consumption and multifunctional directions. The photoelectric logic gate based on the single light source and the single detector provided by the invention carries out logic judgment through the polarity of signal current instead of the magnitude, the on-off ratio of the photoelectric logic gate tends to infinity, and the accuracy of logic judgment is ensured. In addition, the invention utilizes the polarization beam splitting of the same light source to realize a plurality of logic functions, and the operation of the photoelectric logic gate is not influenced by the limited fluctuation of the power of the light source.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings required for the description of the embodiments will be briefly described below, and it is apparent that the drawings in the following description are only some embodiments of the present invention, and other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a multifunctional optoelectronic logic gate provided in accordance with one embodiment of the present invention;
FIG. 2 is a schematic diagram of a bipolar self-driven polarization photodetector according to an embodiment of the present invention.
FIG. 3 is a truth table and corresponding output current response simulation diagram for various logic functions of a logic gate provided in accordance with one embodiment of the present invention.
Detailed Description
For the purpose of making the objects, technical solutions and advantages of the present invention more apparent, the embodiments of the present invention will be described in further detail with reference to the accompanying drawings.
Embodiment one:
the present embodiment provides a multifunctional photoelectric logic gate based on a single light source and a single detector, referring to fig. 1, the multifunctional photoelectric logic gate based on a single light source and a single detector includes: linear polarized light source, first polarization beam splitter PBS 1 An electrically modulated half wave plate HWP, a second polarizing beam splitter PBS 2 50%:50% beam splitter BS 1 And BS 2 Three total reflection mirrors, four optical on-off controllers, a beam combiner and a bipolar self-driven polarization photodetector;
the light beam emitted by the linear polarized light source passes through the first polarization beam splitter PBS 1 The wave is divided into P wave and S wave; p wave passes through a second polarization beam splitter PBS after the polarization direction of the P wave is regulated by an electric modulation half wave plate HWP 2 The light beam is decomposed into P wave and S wave which are respectively called TM wave and TE wave, and the TE wave direction is changed through a total reflection mirror so that the TE wave and the TM wave continue to propagate in the same direction;
TM wave and TE wave pass 50%:50% beam splitter BS 1 And BS 2 Is decomposed to obtain four beams of light, respectively called TM 1 、TM 2 、TE 1 、TE 2 The directions of the two beams of light are changed through a total reflection mirror respectively, so that the four beams of light continue to propagate along the same direction;
TM 1 、TM 2 、TE 1 、TE 2 after passing through one on-off control device, the light is combined into a beam by a beam combiner to irradiate on the bipolar self-driven polarized light detector;
the photoelectric logic gate realizes AND, OR, NOT AND or NOT five basic logic functions by regulating polarization direction through an electrically-modulated half-wave plate HWP and combining on-off of four optical on-off control devices.
The bipolar self-driven polarization photodetector is a detector capable of realizing opposite positive and negative response current of the device under TE/TM polarized light irradiation without external bias.
As shown in fig. 2, the bipolar self-driven polarization photodetector has a nested grating structure, and comprises: the silicon dioxide/silicon substrate, the metal nanowire grating array arranged on the substrate, the semiconductor layer coated outside the metal nanowire grating array and the transparent conductive layer coated outside the semiconductor layer.
In the metal nanowire grating array, the metal nanowire material is silver, and the cross section is rectangular or square; the side length of the metal nanowire is 55+/-5 nm, the length is 3-10 mu m, and the period is 750nm.
The semiconductor layer is made of perovskite material, and the shell thickness of the semiconductor layer is set to 94+/-5 nm.
The transparent conductive layer is prepared from transparent conductive oxide ITO with thickness of 80nm.
The metal nanowires at one end of the metal nanowire grating array are connected through a section of metal nanowire with the width of 50+/-20 nm; the transparent conductive layer at the other end is correspondingly connected.
One end of the metal nanowire grating array is connected with a lead as one end electrode, the other end of the metal nanowire grating array is connected with a transparent conducting layer connected with the lead as the other end electrode, and the leads led out from the two ends of the metal nanowire grating array are connected with each other by an ammeter or connected with a load.
The light on-off control device can adopt an aperture (Aperture) for controlling light on-off, wherein the aperture is defined as logical 1, and the aperture is defined as logical 0; the current signal of the detector is used as logic electric output, and is defined to be output as logic 1 when the current is positive value, and is output as logic 0 when the current is negative value.
The linearly polarized light source is a single visible light laser, and the wavelength range of the visible light laser is 440-550 nm.
Embodiment two:
the present embodiment provides a method for implementing a logic function by using the multifunctional photoelectric logic gate based on a single light source and a single detector according to the first embodiment, referring to fig. 3, the method includes:
determining the ratio of photocurrents of the bipolar self-driven polarized light detector under equal power of TM and TE polarized light incidence, assuming-k, where k >0, then:
when the logic function to be realized is AND gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be in the range of 0.6k to 0.9k, TE is 1 And TE (TE) 2 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 1 And TM 2 The logic light input is defined as two paths of logic light input, the response current of the bipolar self-driven polarization photodetector is defined as one path of logic electric output, and the logic function of the AND gate can be realized;
when the logic function to be realized is OR gate logic, the electricity is regulated in advanceModulating the half wave plate HWP such that the ratio of the intensity of TE and TM components of the linearly polarized light after passing therethrough is in the range of 0.6k to 0.9k, converting TE 1 The corresponding optical on-off controller is set to be in an on state to enable TE 2 The corresponding optical on-off controller is set to be in an off state, and TM is set to be in an off state 1 And TM 2 The bipolar self-driven polarization photodetector response current is defined as one logic electric output, and the OR gate logic function can be realized;
when the logic function to be realized is NAND gate logic, the electrically modulated half-wave plate HWP is regulated in advance to make the ratio of TE and TM components of linear polarized light after passing through it be 1.2k to 1.8k, and TM is fed 1 And TM 2 The corresponding optical on-off controller is set to be in an on state to enable TE 1 And TE (TE) 2 The dual-polarity self-driven polarized light detector is defined as two paths of logic light input, and the response current of the dual-polarity self-driven polarized light detector is defined as one path of logic electric output, so that the NAND gate logic function can be realized;
when the logic function to be realized is NOR gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be 1.2k to 1.8k, and TM is added 1 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 2 The corresponding optical on-off controller is set to be in an off state to enable TE 1 And TE (TE) 2 The bipolar self-driven polarized light detector is defined as two paths of logic light input, and the response current of the bipolar self-driven polarized light detector is defined as one path of logic electric output, so that the NOR gate logic function can be realized;
when the logic function to be realized is NOT gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be 1.2k to 1.8k, and TM is used for regulating the output of the light source 1 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 2 The corresponding optical on-off controller is set to be in an off state to enable TE 1 The corresponding optical on-off controller is set to be in an off state to enable TE 2 The logic light input is defined as one path, and the response current of the bipolar self-driven polarized light detector is defined as one path of logic electric output, so that the NOT gate logic function can be realized.
Embodiment III:
the present embodiment provides a method for implementing a logic function by using the multifunctional photoelectric logic gate based on a single light source and a single detector according to the first embodiment, where the method includes:
generating monochromatic light with the wavelength of 500nm by using a single visible light laser;
when 500nm wavelength monochromatic light is incident, the ratio of photocurrent of the bipolar self-driven polarized light detector under the incidence of equal-power TM and TE polarized light is measured to be 1: -1;
to implement AND gate logic, the HWP is pre-conditioned such that the ratio of the TE and TM components of linearly polarized light passing therethrough is 3:4. Then control TE 1 And TE (TE) 2 Is opened by opening the aperture of TM 1 And TM 2 The detector current is defined as one logic electric output, and the AND gate logic function can be realized;
further, without changing the HWP, only the TE will be controlled 2 Is closed to control TE 1 Is kept open, still TM 1 And TM 2 And determining two paths of logic light input, and realizing an OR gate logic function.
To implement the inverse logic gate, the HWP is controlled such that the ratio of the TE and TM components of linearly polarized light passing therethrough is 4:3. Then control TM 1 And TM 2 Is opened to let TE 1 And TE (TE) 2 The NAND gate logic function can be realized by determining two paths of logic optical inputs;
further, without changing the HWP, only the TM will be controlled 2 Is closed by controlling TM 1 Is kept open, TE is still 1 And TE (TE) 2 The NOR gate logic function can be realized by determining two paths of logic light input; then control TM 1 Is kept open, control TM 2 Keep the aperture closed, and then re-apply TE 1 Closing the aperture to only TE 2 The logic optical input is set as one path, and the NOT gate logic function can be realized.
The current response of fig. 3 corresponding to the logic truth table verifies that the and, or, not, nand, or not basic logic functions are implemented.
It should be noted that, in the description of the present invention, it should be understood that the directions or positional relationships indicated by the terms "middle", "upper", "lower", "front", "rear", "left", "right", "vertical", "horizontal", "top", "bottom", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific direction, be configured and operated in a specific direction, and thus should not be construed as limiting the present invention.
The foregoing description of the preferred embodiments of the invention is not intended to limit the invention to the precise form disclosed, and any such modifications, equivalents, and alternatives falling within the spirit and scope of the invention are intended to be included within the scope of the invention.

Claims (9)

1. A multifunctional optoelectronic logic gate based on a single light source and a single detector, the multifunctional optoelectronic logic gate comprising: linear polarized light source, first polarization beam splitter PBS 1 An electrically modulated half wave plate HWP, a second polarizing beam splitter PBS 2 50% beam splitter BS 1 And BS 2 Three total reflection mirrors, four optical on-off controllers, a beam combiner and a bipolar self-driven polarization photodetector;
the light beam emitted by the linear polarized light source passes through the first polarization beam splitter PBS 1 The wave is divided into P wave and S wave; p wave passes through a second polarization beam splitter PBS after the polarization direction of the P wave is regulated by an electric modulation half wave plate HWP 2 The light beam is decomposed into P wave and S wave which are respectively called TM wave and TE wave, and the TE wave direction is changed through a total reflection mirror so that the TE wave and the TM wave continue to propagate in the same direction;
the TM wave and TE wave respectively pass through 50% to 50% of beam splitter BS 1 And BS 2 Is decomposed to obtain four beams of light, respectively called TM 1 、TM 2 、TE 1 、TE 2 The directions of the two beams of light are changed through a total reflection mirror respectively, so that the four beams of light continue to propagate along the same direction;
TM 1 、TM 2 、TE 1 、TE 2 each via an optical on-off controllerThen a beam of light is synthesized by a beam combiner and irradiated on the bipolar self-driven polarized light detector;
the multifunctional photoelectric logic gate regulates and controls the polarization direction through electrically modulating the half wave plate HWP, and combines the on-off of four optical on-off controllers to realize the AND, OR, NOT AND or NOT five basic logic functions.
2. The optoelectronic logic gate of claim 1 wherein the bipolar self-driven polarized light detector is a detector capable of achieving opposite polarity of the response current of the device in the absence of an applied bias under TE/TM polarized light illumination.
3. The electro-optical logic gate according to claim 2, wherein the bipolar self-driven polarization photodetector is a nested grating structure comprising: the silicon dioxide/silicon substrate, the metal nanowire grating array arranged on the substrate, the semiconductor layer coated outside the metal nanowire grating array and the transparent conductive layer coated outside the semiconductor layer.
4. A gate according to claim 3, wherein in the metal nanowire grating array, the metal nanowire material is silver, and the cross section is rectangular or square; the side length of the metal nanowire is 55+/-5 nm, the length is 3-10 mu m, and the period is 750nm.
5. The optoelectronic logic gate of claim 4, wherein the metal nanowires at one end of the metal nanowire grating array are connected by a length of metal nanowires having a width of 50±20 nm; the transparent conductive layer at the other end is connected.
6. The optoelectronic logic gate of claim 5 wherein the linearly polarized light source is a single visible laser with a visible laser wavelength range of 440-550 nm.
7. A method for implementing logic functions using the single light source single detector based multifunctional optoelectronic logic gate of any one of claims 1-6, the method comprising:
determining the ratio of photocurrents of the bipolar self-driven polarized light detector at equal power of TM and TE polarized light incidence, assuming-k (where k > 0), then:
when the logic function to be realized is AND gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be in the range of 0.6k to 0.9k, TE is 1 And TE (TE) 2 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 1 And TM 2 The logic light input is defined as two paths of logic light input, the response current of the bipolar self-driven polarization photodetector is defined as one path of logic electric output, and the logic function of the AND gate can be realized;
when the logic function to be implemented is OR gate logic, the electrically modulated half-wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be in the range of 0.6k to 0.9k, TE is 1 The corresponding optical on-off controller is set to be in an on state to enable TE 2 The corresponding optical on-off controller is set to be in an off state, and TM is set to be in an off state 1 And TM 2 The logic optical input is defined as two paths, and the response current of the bipolar self-driven polarization photodetector is defined as one path of logic electric output, so that the OR gate logic function can be realized.
8. A method for implementing logic functions using the single light source single detector based multifunctional optoelectronic logic gate of any one of claims 1-6, the method comprising:
determining the ratio of photocurrents of the bipolar self-driven polarized light detector at equal power of TM and TE polarized light incidence, assuming-k (where k>0) Then: when the logic function to be realized is NAND gate logic, the electrically modulated half-wave plate HWP is regulated in advance to make the ratio of TE and TM components of linear polarized light after passing through it be 1.2k to 1.8k, and TM is fed 1 And TM 2 The corresponding optical on-off controller is set to be in an on state to enable TE 1 And TE (TE) 2 The response current of the bipolar self-driven polarized light detector is defined as one logic electric outputThe NAND gate logic function can be realized;
when the logic function to be realized is NOR gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be 1.2k to 1.8k, and TM is added 1 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 2 The corresponding optical on-off controller is set to be in an off state to enable TE 1 And TE (TE) 2 The bipolar self-driven polarized light detector is defined as two paths of logic light input, and the response current of the bipolar self-driven polarized light detector is defined as one path of logic electric output, so that the NOR gate logic function can be realized;
when the logic function to be realized is NOT gate logic, the electrically modulated half wave plate HWP is regulated in advance to make the ratio of TE and TM component intensities of linear polarized light after passing through it be 1.2k to 1.8k, and TM is used for regulating the output of the light source 1 The corresponding optical on-off controller is set to be in an on state, and TM is set to be in an off state 2 The corresponding optical on-off controller is set to be in an off state to enable TE 1 The corresponding optical on-off controller is set to be in an off state to enable TE 2 The logic light input is defined as one path, and the response current of the bipolar self-driven polarized light detector is defined as one path of logic electric output, so that the NOT gate logic function can be realized.
9. The method of claim 7 or 8, wherein the method comprises bringing TM 1 、TM 2 、TE 1 、TE 2 Two or one of the two paths is used as logic light input, the on state of the light input is defined as logic 1, and the off state is defined as logic 0; the response current signal of the bipolar self-driven polarization photodetector is used as logic electric output, and the response current signal is defined to be output as logic 1 when the response current is positive value, and is output as logic 0 when the response current is negative value.
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