72results about "Optical bistable devices" patented technology

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.

Systems and methods are disclosed for making a quantum network node. A plurality of scoring function F values are calculated for an array of at least two photonic crystal cavity unit cells, each having a lattice constant α and a hole having a length Hx and a width Hy. A value of α, a value of Hx, and a value of Hy are selected for which a scoring function value is at a maximum. A waveguide region and the array of at least two photonic crystal cavity unit cells based on the selected values are formed on a substrate. At least one ion between a first photonic crystal cavity unit cell and a second photonic crystal cavity unit cell are implanted and annealed into a quantum defect. A coplanar microwave waveguide is formed on the substrate in proximity to the array of at least two photonic crystal cavity unit cells.

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.

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.

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

The invention discloses a signal generating device which comprises a laser, an optical modulator, a Fabry-Perot ultra-stable cavity, a controlled signal generator, a radio frequency source and a photoelectric detector. The laser modulated by the light modulator is input into the Fabry-Perot ultra-stable cavity; the photoelectric detector detects transmission light of the Fabry-Perot ultra-stable cavity and converts an optical signal into a detection signal; the detection signal is divided into two paths, the first path of detection signal and a first target locking signal generate a first control signal, so that the laser is locked on a first target locking frequency; and the second path of detection signal and the second target locking signal generate a second control signal, so that the first frequency of the first signal generated by the controlled signal generator is locked on the second target locking frequency. The signal generating device does not need to use a femtosecond optical frequency comb and only uses the laser and the ultra-stable cavity, so that the cost, the system complexity and the system size can be remarkably reduced.

The system includes a controller configured to reconstruct the continuous waveform into a discrete analog version. The system includes a numerical optimizer configured to determine the frequency of the pulse sequence. The numerical optimizer uses the radial motion mode frequency and the desired gate time. The numerical optimizer generates the pulse sequence by closing phase space trajectories, disentangling spin and motion, and constraining Rabi frequencies for motional sideband transitions. The system also includes a display configured to depict the discrete frequency-modulated pulse sequence based on the determined frequency.

The present invention provides an all-optical switch based on Period-Doubling photonic crystal, which belongs to the technical field of all-optical communication. It includes a plurality of first dielectric layers, a plurality of second dielectric layers and two graphene monolayers, the first dielectric layer is denoted as H, the second dielectric layer is denoted as L, and the graphene monolayer is denoted as G. The layered structure of the all-optical switch is represented as: HL1GL2HH1GH1HL2GL1HL, wherein L1GL2 and L2GL1 both represent a three-layer structure formed by a graphene monolayer embedded in the second dielectric layer, H1GH1 represents a three-layer structure formed by a graphene monolayer embedded in the middle of the first dielectric layer, the thickness of the first dielectric layer and the second dielectric layer are 1 / 4 of their respective optical wavelengths, and the first dielectric layer and the second dielectric layer are two uniform dielectric sheets with high and low refractive indices, respectively. The present invention can be applied to all-optical switches.

An optical computing device includes an image sensor including one or more light receiving cells, one or more optical modulation elements each including cells that each have a phase-modulation amount, an optical splitter element that splits signal light into monitoring signal light entering the image sensor and computing signal light entering the one or more optical modulation elements, and a controller that independently sets the phase-modulation amount of each of the cells in accordance with an intensity of the monitoring signal light detected by a corresponding one of the light receiving cells of the image sensor.

The present invention provides a composite structure based on a double-periodic graphene array, which belongs to the field of all-optical communication technology. It includes a plurality of periodic composite units, each of which includes a first dielectric layer, a second dielectric layer and a single-layer graphene. The composite units are arranged in the following manner: a single-layer graphene, a first dielectric layer, a single-layer graphene, and a second dielectric layer are sequentially arranged from one side of the incident direction of the composite structure to the other side; the thickness of the first dielectric layer is less than that of the second dielectric layer; and a layer of graphene is arranged on the exit side. The present invention has the advantages of strong resonance of the resonant state and the like.

Some embodiments in the present disclosure relate to an apparatus and methods to excite a trapped ion. A first laser beam and a second laser beam pass through at least one common lens of an objective. The two laser beams are focused by said objective at the position of the trapped ion. A moving standing wave is generated at the position of the trapped ion, which induces a force on the trapped ion. Two ions may be entangled by generating such moving standing wave at the respective positions of both of said ions.

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.

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.

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.