47results about "Optical bistable devices" patented technology

A photonic random access memory employs series connected photosensors to define switching nodes driving optical modulators, the series connection operating to reduce the effect of photosensor dark current.

The invention relates to a terahertz metamaterial modulator based on lambda-Ti3O5 bistable phase change. The modulator comprises a silicon substrate layer (1); the semiconductor phase beta-Ti3O5 layer (2) grows on the surface of the silicon substrate layer (1); the lambda-Ti3O5 strip (3) of the metal phase is nested in the beta-Ti3O5 layer (2) of the semiconductor phase; and the metal strip (4) grows on the surface of the beta-Ti3O5 layer (2) of the semiconductor phase. The modulator further comprises a space pattern controller which is used for controlling the phase change area of Ti3O5 and achieving erasing and rewriting of the unit structure. Compared with the prior art, the terahertz modulator has the advantages of large modulation depth, dynamic adjustability of multiple functions and the like, has a wide application prospect in the terahertz related technical field, enriches terahertz regulation and control functional devices, and can promote the development of the terahertz technology.

Disclosed are systems and techniques for generating and steering laser beams onto atoms for performing locally addressed quantum gate operations. A system may include (i) a high-speed acousto-optic modulator (AOM) for producing a single input beam, (ii) a phase- only spatial light modulator (SLM) for imprinting a phase pattern on the single input beam, the phase pattern being chosen such that after a lens positioned after the SLM, the single input beam is divided into a pattern of secondary beams that correspond to the positions of the atoms or ions in a quantum computer, the lens after the SLM being positioned so the secondary beams are focused to form an image on a digital micromirror device (DMD) amplitude modulator, (iii) a compensation grating after the DMD, in the path of the secondary beams, and (iv) an objective lens after the compensation grating to image the secondary beams onto an atomic array.

A method for performing computations in a system having a matrix multiplication unit that converts an optical input vector to an analog output vector based on a plurality of weight control signals, the method comprising: receiving a computation request comprising at least one digital input vector and a first plurality of weights; storing the digital input vector and the first plurality of weights in a storage unit; generating a first plurality of modulator control signals based on the digital input vector, generating a first plurality of weight control signals based on the first plurality of weights; generating an optical input vector based on the first plurality of modulator control signals; obtaining a first plurality of digital outputs corresponding to the analog output vector, the first plurality of digital outputs forming a first digital output vector; performing, by the controller, a non-linear conversion on the first digital output vector to produce a first converted digital output vector; storing the first converted digital output vector in a storage unit; an output generated based on the first converted digital output vector is output by the controller.

An example optical system having an electro-optical (EO) logic gate connected to a controller is presented. The controller modulates a first encoded electrical signal and a second encoded electrical signal based on an operation selection input. The EO logic gate includes a first Mach Zehnder interferometer (MZI) coupled between an optical input port and an optical output port; a second MZI optically coupled in parallel with the first MZI; a first phase shifter adjacent to the first MZI and; and a second phase shifter adjacent to the second MZI. The phase shifters apply phase shifts to the optical signals propagating via the first and second MZIs based on the modulated first encoded electrical signal and the modulated second encoded electrical signal to cause an optical output at the optical output port to vary based on the logic operation of the first encoded electrical signal and the second encoded electrical signal.

The invention provides an optical bistable device based on an optical Tamm state and application of the optical bistable device. The optical bistable device comprises a metal substrate layer, a transparent conductive oxide film and a photonic crystal layer, wherein the transparent conductive oxide film and the photonic crystal layer are sequentially arranged on the metal substrate layer; the photonic crystal layer comprises x unit cell structures stacked on the transparent conductive oxide film from bottom to top, and x is greater than or equal to 2; each unit cell structure comprises A Si layers and B SiO2 layers; in each unit cell structure, n (Si) d (Si) = n (SiO2) d (SiO2), so that the band gap of the photonic crystal layer covers the ENZ wavelength of the transparent conductive oxide film; and the surface equivalent impedance of the metal substrate layer and the transparent conductive oxide film is matched with the relative surface impedance of the photonic crystal layer, so that a Tamm state is formed between the interfaces of the transparent conductive oxide film and the photonic crystal layer. According to the invention, the bistable effect is realized under multiple incident angles, two polarizations and different wavelengths, the bistable working wavelength can be moved to an area smaller than the ENZ wavelength of the material, and the optical bistable state is realized.

The subject of the present invention is a method for controlling the spatial arrangement of domains of mesogenic compounds, exhibiting the ability to synchronise chirality by controlled synchronisation of conformational chirality, characterised in that an area of a thin film of a compound forming a conglomerate of domains is heated above the isotropisation temperature of a given compound until a specific chirality is obtained in a given area, and the shape of the heated area corresponds to a selected pattern enabling the control of the crystallisation front, wherein the heating is carried out by means of area illumination with laser light of a wavelength corresponding to the high absorbance of the melted compound and / or area heating of a substrate on which the thin film of the compound is placed and / or by area illumination with laser light of a wavelength corresponding to the high absorbance of a dye added to the film.

To provide a microscope equipped with an exchange device that enables the number of calibration processes to be reduced. The imaging system (100) includes an exchange device (102) having an exchange holder (108) that houses an optical element (106) and thereby positions it in an optical beam path (104) of the imaging system, and an access element (112) that has an open state and a closed state and allows access to the optical element housed in the exchange holder in the open state. The exchange device includes a bistable element (114) that has a first stable state and a second stable state, transitioning from the first stable state to the second stable state when the access element is open and remaining in the second stable state when the access element is closed. A control unit determines whether the first stable state or the second stable state is in place, and, if the second stable state is in place, determines that the access element has been opened and that access to the optical element housed in the exchange holder is enabled.

A photonics reservoir computing system is described. The system is configured for propagating at least one optical signal so as to create resulting radiation signals in the output channels. The photonics reservoir computing system further comprises weighting elements for weighting signals from the output channels, and at least one optical detector for optically detecting signals from the output channels. The system is adapted for estimating signals from the output channels through an output of the optical detector.

The imaging system comprises a replacement device having a replacement holder and an access element, the replacement holder being configured to receive at least one optical element and thereby arrange the optical element in an optical beam path of the imaging system, the access element has an open and closed state and is configured to allow access to the optical element housed in the replacement bracket in the open state. The replacement device further comprises a bistable element having a first stable state and a second stable state and configured to transition from the first stable state to the second stable state when the access element is open and remain in the second stable state when the access element is closed. The imaging system further comprises a control unit configured to determine whether the bistable element is in a first stable state or a second stable state, and to determine that the access element is opened and thereby permit access to the optical element housed in the replacement bracket when the bistable element is in the second stable state.

To provide a microscope equipped with an exchange device capable of reducing the number of times of a calibration process.SOLUTION: An imaging system (100) includes an exchange device (102) having an exchange holder (108) for accommodating an optical element (106) and thereby arranging it in an optical beam path (104) of the imaging system, and an access element (112) having an open state and a closed state and allowing access to the optical element accommodated in the exchange holder in the open state. The exchange device includes a bistable element (114) having a first stable state and a second stable state, the bistable element transitioning from the first stable state to the second stable state upon opening of the access element and remaining in the second stable state upon closing of the access element. The control unit determines whether it is in the first stable state or in the second stable state and, in the second stable state, determines that the access element is opened and access to the optical element accommodated in the exchange holder is enabled.SELECTED DRAWING: Figure 1

Provided is an optical computing device that can carry out a wider variety of optical computing in comparison to a conventional optical computing device. An optical computing device (1) includes: an image sensor (12ai) including a plurality of light receiving cells; an optical modulation element (11ai) including a plurality of cells having respective phase-modulation amounts that are settable independently of each other; an optical splitter element (13ai) that splits signal light into signal light for monitoring which enters the image sensor (12ai) and signal light for computing, the signal light for computing which enters the optical modulation element (11ai); and a control section (14) that sets a phase-modulation amount of each cell of the optical modulation element (11ai) in accordance with an intensity of the signal light for monitoring detected by a light receiving cell of the image sensor (12ai), the light receiving cell corresponding to the cell.

A low-threshold optical bistable switch design method based on a double-layer graphene light power system comprises the following steps that (1) the double-layer graphene light power system is established, the system is subjected to the combined action of pump light with the frequency being omega pu and probe light with the frequency being omega pr, and the amplitude of a pump field is Epu, and the amplitude of a probe field is Epr; the double-layer graphene of the double-layer graphene light power system is arranged in parallel, and an electric field vertically acts on a graphene film plane; 2) deducing a correlation quantity of the optical bistable characteristic; the definition formula of the dimensionless linear optical polarizability is shown as follows: 3) regulating and controlling the phonon-pumping field detuning amount delta n through the applied pumping field frequency; the phonon-exciton coupling strength g is controlled through the length of the graphene film; and the exciton-pumping detuning amount delta ex is regulated and controlled by adjusting the frequency of a pumping field. The invention provides a new method for designing low-threshold, single-channel and dual-channel optical bistable switches.

A system includes a controller configured to reconstruct a continuous waveform into a discrete analog version. The system includes a numerical optimizer configured to determine the frequency of a pulse sequence. The numerical optimizer uses radial motion mode frequencies and desired gate times. The numerical optimizer generates the pulse sequence by disabling phase space trajectories, unwrapping spins and motion, and limiting the Rabi frequencies of motion sideband transitions. The system also includes a display configured to illustrate the discrete-frequency modulated pulse sequence based on the determined frequencies.

A transistor comprises a planar layer of a topological material located between a gate electrode and a dielectric layer. The topological material exhibits a topological phase transition between a trivial state and a non-trivial state at a critical electric field strength on application of an electric field in a direction perpendicular to the planar layer. The topological material exhibits a change in bandgap, in the presence of the electric field, having a Rashba spin-dependent bandgap contribution that is at least three times as large as a non-spin-dependent bandgap contribution.

Examples of the present technology provide “tensorized” integrated coherent Ising machines that improve scalability by leveraging a tensorized optical coupling matrix comprising layers of multi-wavelength photonic tensor-train (TT) cores cascaded together via passive optical cross-connects. A multi-wavelength photonic TT core may comprise a Mach Zehnder interferometer (MZI) mesh (i.e., a lattice / array of interconnected MZIs) that modulates the phase and / or amplitude of optical signals. Tensorized integrated CIMs of the present technology can achieve further scalability optimizations by implementing bistable Ising nodes via one or more multi-wavelength Ising node collections. A multi-wavelength Ising node collection may comprise a bistable Ising nodes implemented on a common MZI, where each bistable Ising node of the multi-wavelength Ising node collection is associated with a separate wavelength of light.

An imaging system (100) comprises a changing device (102) with a changing holder (108) which is designed to receive at least one optical element (106) and thereby to arrange it in an optical beam path (104) of the imaging system (100), and an access element (112) which has an open and a closed state and is designed to enable access to the optical element (106) received in the changing holder (108) in the open state. The changing device (102) further comprises a bistable element (114) which has a first stable state and a second stable state and is designed to transition from the first stable state to the second stable state when the access element (112) is opened and to remain in the second stable state when the access element (112) is closed.The imaging system (100) further comprises a control unit (120) which is designed to determine whether the bistable element (114) is in the first stable state or the second stable state, and to determine that the access element (112) has been opened and thus access to the optical element (106) accommodated in the interchangeable holder (108) has been made possible when the bistable element (114) is in the second stable state.

Methods, circuits, devices, systems and techniques for photonic computing are provided. In one aspect, a method for photonic computing includes; modulating at least one optical source or optical modulator based on an input matrix of a mathematical function to generate at least one modulated input optical signal, modulating at least one of the at least one modulated input optical signal or a plurality of photodetectors based on a weight matrix of the mathematical function, directing at least one modulated optical signal to the plurality of photodetectors, and generating electrical outputs based on outputs of the plurality of photodetectors using a control circuitry. The electrical outputs represent a computation result of the mathematical function corresponding to a multiplication of the input matrix and the weight matrix. An activation function of the mathematical function is implemented by at least one of the control circuitry or the plurality of photodetectors.

A purely optical XOR gate is disclosed, implemented entirely within fiber optic channels and without any electrical control elements. Two digital data light inputs, A and B, are each amplified, split, and partially converted to higher-frequency control light via frequency doublers. The control light from each input is directed into a corresponding right-angle Data Light Extinguisher (DLE) intersecting the opposite channel, where it extinguishes simultaneous “1” pulses by inducing a waveguide cutoff through piezoelectric deformation. The remaining data light pulses, representing conditions where only A or only B is high, are combined into a single output channel. This architecture operates in parallel optical paths without reflections or high voltage, enabling high-speed, low-loss XOR logic entirely in the photonic domain.

The invention discloses a passive multi-throw optical multistable all-optical switch based on an annular cavity system and a control method thereof, and the passive multi-throw optical multistable all-optical switch is characterized in that the passive multi-throw optical multistable all-optical switch comprises a one-way annular optical cavity and a rubidium bubble, the rubidium bubble is a cylindrical glass bubble which is located at the central position of the axis of the left upper cavity mirror and the central position of the axis of the right upper cavity mirror and filled with rubidium 85 atomic gas, and a monochromatic light field in the cavity can penetrate through the left side and the right side of the cylindrical glass bubble. Under the strong coupling condition of an atom-cavity system, the monochromatic cavity mode can excite multiple transition energy levels of rubidium atoms at the same time, so that strong optical nonlinear interaction is caused, and multiple different transmitted light intensity values can be achieved by modulating the light intensity of signal light. The multi-throw all-optical switch disclosed by the invention is based on an optical multistable state excited by signal light, does not need an additional auxiliary light field, a magnetic field and the like, and has the advantages of wide band, passivity, low power consumption, multiple channels, simple structure, easiness in integration and miniaturization and the like.

A photonic circuit that operates as a photonic flip-flop includes a first photonic gate coupled to a second photonic gate. A first input of the first photonic gate receives a first photonic input signal. A second input of the first photonic gate is coupled to an output of the second photonic gate and receives a second photonic output signal generated by the second photonic gate. The first photonic gate generates a first photonic output signal based on the first photonic input signal and the second photonic output signal. A first input of the second photonic gate receives a second photonic input signal. A second input of the second photonic gate is coupled to an output of the first photonic gate and receives the first photonic output signal. The second photonic gate generates the second photonic output signal based on the second photonic input signal and the first photonic output signal.

Circuits and methods that implement multiplexing for photons propagating in waveguides are disclosed, in which an input photon received on a selected one of a set of input waveguides can be selectably routed to one of a set of output waveguides. The output waveguide can be selected on a rotating or cyclic basis, in a fixed order, and the input waveguide can be selected based at least in part on which one(s) of a set of input waveguides is (are) currently propagating a photon.

Systems and methods that include: providing input information in an electronic format; converting at least a part of the electronic input information into an optical input vector; optically transforming the optical input vector into an optical output vector based on an optical matrix multiplication; converting the optical output vector into an electronic format; and electronically applying a non-linear transformation to the electronically converted optical output vector to provide output information in an electronic format.In some examples, a set of multiple input values are encoded on respective optical signals carried by optical waveguides. For each of at least two subsets of one or more optical signals, a corresponding set of one or more copying modules splits the subset of one or more optical signals into two or more copies of the optical signals. For each of at least two copies of a first subset of one or more optical signals, a corresponding multiplication module multiplies the one or more optical signals of the first subset by one or more matrix element values using optical amplitude modulation. For results of two or more of the multiplication modules, a summation module produces an electrical signal that represents a sum of the results of the two or more of the multiplication modules.

An apparatus for combined digital and optical processing of a cryptocurrency data block includes a digital processor that computes a hash vector from the cryptocurrency data block; a laser and splitter that produces optical input signals; optical modulators that binary phase-shift key modulate the optical input signals based on the hash vector; a photonic matrix multiplier circuit that performs an optically perform a discrete matrix-vector product operation on the modulated optical input signals to produce optical output signals, where the discrete matrix-vector product operation is defined by matrix elements limited to K discrete values, where 2≤K≤17; and photodetectors and comparators that perform optoelectronic conversions of the optical output signals to produce corresponding digital electronic output signals. The digital processor performs a second hash computation on an XOR result between the digital electronic output signals and the hash vector to produce a proof of work result.

Systems and method directed to stochastic optical computing architecture with reconfigurable logic and accumulation are disclosed. In one embodiment, an optical logic gate includes a single microring resonator having an input port and an output port; one or more input terminals connected to apply logic signals to the microring resonator; and a tuning component to shift a resonance frequency of the microring resonator, wherein a transmission between the input port and output port of the microring resonator performs a logic operation on signals applied to the one or more input terminals.

The invention provides a magnetic field regulation and control circular polarization light-emitting structure, a preparation method of the magnetic field regulation and control circular polarization light-emitting structure and application of the magnetic field regulation and control circular polarization light-emitting structure in the aspects of visualization, multi-dimensional data coding, anti-counterfeiting, information encryption and the like. The magnetic field regulation and control circular polarization light-emitting structure comprises a dye-doped composite PDMS (Polydimethylsiloxane) film; and the Ag coated Fe3O4 nanowire layer is compounded on the dye doped composite PDMS thin film. Compared with the prior art, the CPL is directly generated through the light-induced polymerization process, and the wavelength and optical rotation of the CPL can be accurately adjusted by regulating and controlling the molecular characteristics of the doped dye or the thermally induced phase change (from blue phase to red phase) of PDA; the strategy supports the preparation of a multi-color CPL microarray, the realization of a switchable logic gate and a multi-level information storage and encryption function; the method provides a new path for in-situ adjustment of fluorescence and CPL distribution in the flexible film, and has a wide application prospect in the fields of multi-dimensional information encryption, advanced anti-counterfeiting and intelligent optical devices.

The application discloses a low-threshold optical bistable switch based on a hybrid superstructure surface and relates to an optical bistable switch device. From bottom to top, the device is sequentially provided with a supporting substrate, a uniform surface plasmon film, a low-refractive Kerr nonlinear medium film and a high-refractive medium disc periodic array. Under the configuration of the hybrid superstructure surface, mirror surface effect of electric dipole resonance and coupling effect of surface plasmon resonance can be simultaneously generated, electric field energy of incident light is localized in the low-refractive Kerr nonlinear medium film, and thus the Kerr effect of the low-refractive Kerr nonlinear medium film is effectively excited. When the intensity of the incident light continuously increases, the low-threshold optical bistable switch can jump from an 'on' state to an 'off' state. Conversely, when the intensity of the incident light continuously decreases, the low-threshold optical bistable switch can jump from the 'off' state to the 'on' state. The low-threshold optical bistable switch has a large switch ratio, is not related to polarization, is simple to prepare and compatible with a complementary metal oxide semiconductor process, and can become a potential all-off switch device.

A device for weight adjustment in an optical neural network is provided. The device includes a first waveguide configured to receive and transmit an input optical signal. The input optical signal is defined by an amplitude and a first wavelength. The device further includes an optical resonator in optical communication with the first waveguide. The optical resonator has a first refractive index and is defined by a first resonance frequency. The amplitude of the input optical signal is modulated by the optical resonator based on the first resonance frequency to obtain a first weighted input optical signal. The device further includes a second waveguide optically coupled with the optical resonator. The second waveguide is configured to transmit a backpropagation optical signal that is defined by a second wavelength. The backpropagation optical signal is partially coupled into the optical resonator to adjust the first resonance frequency to a second resonance frequency. An amplitude of a subsequent input optical signal is modulated by the optical resonator based on the second resonance frequency to obtain a second weighted input optical signal.

This invention discloses a control method and oscillator for a bistable optically driven oscillator, relating to the fields of smart materials and soft robotics. The control method for a bistable optically driven oscillator includes: establishing a light-thermal-mechanical-motion coupling model of an LCE optical fiber; determining, through the coupling model, the mapping relationship between the light intensity acting on the LCE optical fiber, the material parameters of the LCE optical fiber or the geometric parameters of the oscillator, and the oscillation frequency and critical contraction strain of the oscillator; and controlling the oscillation state of the oscillator within its self-oscillation period by adjusting the light intensity acting on the LCE optical fiber, or adjusting the spring stiffness ratio, or adjusting the initial delay distance between the slider and the light-blocking rod. Theoretical modeling reveals the regulation law of the light intensity of the LCE optical fiber, the material parameters of the LCE optical fiber, or the geometric parameters of the oscillator on the critical contraction strain and oscillation frequency, enabling precise control of the oscillator's motion state. The method is simple in structure, flexible in control, and has high assembly tolerance.

The present disclosure relates to a field of photonic computing and provides a photonic computing system including: a photonic computing unit configured to receive a first plurality of optical signals, wherein the first plurality of the optical signals represent a first set of values respectively. The photonic computing unit includes a plurality of weight modules, the weight modules represent a plurality of predetermined values respectively, and each of the weight modules corresponds to one of the predetermined values. Each of the weight modules includes: an optical input part configured to receive one optical signal of the first plurality of the optical signals, and at least one directional coupler. The weight module corresponds to one of the predetermined values to achieve the multiplication operation.