7results 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.

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.

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.

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 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.

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 includes: a first unit including an electronic circuit that generates a plurality of modulator control signals; a processing unit comprising: a light source providing a plurality of light outputs having a plurality of wavelengths; a plurality of light modulators comprising: a group of light modulators coupled to the light source and the first unit, generating a plurality of light input vectors or matrices by modulating a plurality of light outputs provided by the light source based on a plurality of modulator control signals; and an optical multiplexer combining the plurality of optical input vectors or matrices into a combined optical input vector or matrix comprising a plurality of wavelengths, an optical matrix multiplication unit coupled to the plurality of optical modulators, converting the combined optical input vector or matrix into an optical output vector or matrix based on a plurality of weights; the photoelectric detection unit is coupled to the optical matrix multiplication unit and generates a plurality of analog output voltages corresponding to the optical output vectors or matrixes; and a second unit comprising an electronic circuit coupled to the optical matrix multiplication unit and converting the analog output voltage into a digital output vector or matrix.