31results 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.

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 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 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.

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.

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.

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.

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.

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.

The invention provides an optical frequency comb control method and system based on a step and bistable effect, and relates to the technical field of integrated photonics, and the method comprises the steps: generating a step and bistable region through adjusting the structure parameters and / or material types of a cavity optical mechanical-thermal system; laser detuning amount scanning is carried out in a stepped and bistable region, and the comb tooth state of the optical frequency comb is controlled by changing the scanning direction to adjust the laser detuning amount of the cavity resonant frequency in the cavity optical mechanical-thermal system. According to the invention, through cooperative work of steps and bistable states, two operations of rapid hopping and low power consumption locking can be completed in the same device, a complete control closed loop of rapid write-nonvolatile maintenance is formed, system delay and energy consumption are significantly reduced, and the control efficiency of the optical frequency comb is improved to a great extent.

Methods and controllers for reading a quantum state of an atomic object and / or qubit using coherent shelving are provided. A controller causes a first beam of a first wavelength and a second beam of a second wavelength to be incident on the qubit and causes a reading beam to be incident on the qubit. The first wavelength and the second wavelength are configured to couple a state of a qubit space of the qubit to a stable state. The stable state has a lifetime that is longer than a length of time required for performing a reading operation. The first beam and the second beam are generated by at least one manipulation source operated by at least one manipulation source driver of and / or in communication with and / or controlled by the controller.

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.

The system and method include: providing input information in electronic format; converting at least a portion of the electronic input information into an optical input vector; optically converting the optical input vector into an optical output vector based on optical matrix multiplication; converting the optical output vector into an electronic format; and electronically applying a nonlinear transformation to the electronically converted optical output vector to provide output information in electronic format. In some examples, a set of multiple input values ​​is encoded on corresponding 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 replication modules divides the subset of one or more optical signals into two or more copies of the optical signal. 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 the results of two or more multiplication modules, a summation module is used to generate an electrical signal representing the sum of the results of the two or more multiplication modules.

The invention relates to the technical field of metal micro-nano optical devices and electro-optical integration, in particular to a multi-band electro-optical NOT gate based on MIM waveguide and VO2 phase change in the technical field of integrated circuit optical networks and on-chip optical computing. The device structure comprises an MIM single waveguide-circular resonator formed by taking metal silver as a substrate, and a VO2 micro-nano ring and an electrode regulation and control unit which are attached to the outside of the circular resonator. The time domain finite difference method (FDTD) and the finite element method (FEM) are adopted for verification, the VO2 electro-insulator-metal phase change characteristic is utilized, the multi-band plasma resonance effect of the MIM circular resonator is combined, and electric control on-off of optical signals is achieved in the nanometer size. The single-input single-output electro-optical NOT logic operation can be realized, and 800-1800nm multi-band work can be supported by depending on the multi-formant characteristic. The method has great application prospects in the fields of on-chip optical communication, ultra-compact photon integration, micro-nano sensing and optical calculation, and provides efficient and flexible information processing capacity for integrated electro-optical logic regulation and control.

The application discloses a flexible bistable light-driven composite beam device and a preparation method thereof, and belongs to the technical field of flexible electronic devices. The composite beam device comprises, from top to bottom, an upper film layer coated with a photo-thermal conversion agent on the upper surface, a heat preservation interlayer, a lower film layer coated with a photo-thermal conversion agent on the lower surface and support frames on both sides. The upper and lower film layers are formed of liquid crystal elastomers, and the surfaces of the upper and lower film layers are coated with photo-thermal conversion agents, so that photo-thermal contraction strain can be generated in response to an external light source (808 nm laser). The heat preservation interlayer is formed of silica aerogel and is located between the two film layers, has excellent heat insulation, is suitable for the contraction movement of the film layers and simultaneously enhances the flexibility and rigidity of the structure. The device has two stable states of upturning and downturn, can realize the switching of the stable states through the stimulation of an 808 nm light source, has a lower switching threshold, higher response efficiency and better stability.

An optical information processing system comprising a nonlinear element selected in relation to input optical pulses to initiate nonlinear optical frequency conversion and a detection unit, the nonlinear element receiving encoded information input in form of pulsed light, pulsed light from the nonlinear element being read-out by the detection unit for spectro-temporal feature extraction, and the readout being used to train the system on a specific target to obtain a task-specific output or re-directed to the nonlinear element to obtain an input-dependent output, yielding processed information comprising selective positions in an output of the system. A method for training an optical system comprises, for each individual optical input information, reading specific optical amplitude or phase features from specific output bins of the system in time or frequency, weighting and evaluating the specific features towards optimizing user-defined fitness function to identify, classify, or fit the input information.

The application discloses an optical Ising model calculation method and system based on wavelength division multiplexing. The application can load any Ising model, greatly increases the adaptability of the system, has the advantages of wide application range, fast information transmission, simple structure, low cost, fast calculation and the like. The application takes a coherent multi-wavelength light source as a signal input, splits the light field by using a light splitting device, then encodes the spin, interaction and magnetic field parameters on the light signals of different wavelengths by using an optical modulator, performs optical Fourier transform by using a lens system, makes the light fields of the same wavelength interfere, and combines the light fields of different wavelengths, finally measures the total light intensity after combination by using a detector, so that the Hamiltonian of the Ising model of optical calculation of any interaction is realized. The method provided by the application has important application prospects in solving optimization problems and Ising model phase transition research and the like, and is convenient to integrate in optical chips and the like specific applications.

The system and method include: providing input information in electronic format; converting at least a portion of the electronic input information into an optical input vector; optically converting the optical input vector into an optical output vector based on optical matrix multiplication; converting the optical output vector into an electronic format; and electronically applying a nonlinear transformation to the electronically converted optical output vector to provide output information in electronic format. In some examples, a set of multiple input values ​​is encoded on corresponding 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 replication modules divides the subset of one or more optical signals into two or more copies of the optical signal. 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 the results of two or more multiplication modules, a summation module is used to generate an electrical signal representing the sum of the results of the two or more multiplication modules.

A method for performing a nonlinear optical operation includes pumping a laser with an optical signal at a pump wavelength and pumping the laser with an electronic or optical bias that acts as a hyperparameter, filtering out optical output at the pump wavelength so that only light at a lasing wavelength exits the laser, and collecting light exiting the laser for further optical processing or detection.

Selectively configurable photonic logic gates, systems, and methods are provided. In at least one example, a photonic logic gate includes first and second inputs. The first input is configured to receive a first light having a first intensity and a first polarization. The second input is configured to receive a second light having a second intensity and a second polarization. The photonic logic gate is configured to generate a logical output based on the first and second intensities and the first and second polarizations of the first and second lights.