70 results about "Waveguide (optics)" patented technology

Optical systems such as image display systems include a freeform optical waveguide prism and a freeform compensation lens spaced therefrom by a gap of air or index cement. The compensation lens corrects for aberrations which the optical waveguide prism will introduce in light or images from an ambient real-world environment. The optical waveguide prism receives actively projected images at an entry location, and emits the projected images at an exit location after internally reflecting the images along an optical path therein. The image display system may include an image source and coupling optics. The approach permits design of an optical viewing device, for example in optical see-through HMDs, achieving an eyeglass-form appearance and a wide see-through field of view (FOV).

A linear optical sampling apparatus, temporally samples a modulated optical signal using the amplitude of the interference of its electric field with the electric field of a laser pulse. The apparatus includes a 90° optical hybrid that combines the optical signal and laser pulse in order to generate two quadratures interference samples S_A and S_B. A processor compensates for optical and electrical signal handling imperfections in the hybrid, balanced detectors, and A/D converters used in the optical sampling apparatus. The processor numerically scales the two quadratures interference samples S_A and S_B over a large collection of samples by imposing that the average <S_A>=<S_B>=0 and <S_A²>=<S_B²> and then minimizes 2<S_A·S_B>/(<S_A²>+<S_B²>)=cos(φ_B−φ_A)). This is done by adjusting the phase between the two quadratures (ideally either −π/2 or +π/2) so that cos(φ_B−φ_A)) is zero. The processor then generates a demodulated sample signal using the quadratures interference samples S_A and S_B. According to one feature, the hybrid sets the relative phase between two quadratures of their interferometric component so that the phase sensitivity inherent to linear optics is removed. A variety of hybrid arrangements is disclosed that can be implemented using integrated waveguide technology. The apparatus enables sampling of picosecond pulses up to 640 Gb/s with high sensitivity and temporal resolution.

An optical concentrator having a concentrating element for collecting input light, a redirecting element for receiving the light and also for redirecting the light, and a waveguide including a plurality of incremental portions enabling collection and concentration of the light onto a receiver. Other systems replace the receiver by a light source so the optics can provide illumination.

A hybrid integration process for fabrication of an optical cross-connect switching apparatus. The switching element is based on the deflection of light beam in electro-optic materials by applying electric field across electrodes of an appropriate configuration. The integration process includes fabrication of a substrate (e.g. silicon substrate) with 2D imaging optics from polymeric materials (or silica), fabrication of the light deflecting element, and assembly of the deflecting element on the substrate with imaging optics. The fabrication of the light deflecting element includes fabrication of a LN (lithium niobate) block. The LN block assembled in an optical switching apparatus includes a two-dimensional waveguide formed on a surface of the LN block and an electrode on a surface of the LN block.

An imaging light guide has waveguide for conveying image-bearing light beams from an image source to an eyebox within which a virtual image can be viewed. First and second in-coupling diffractive optics direct first and second sets of the image-bearing light beams into the waveguide along different first and second paths. First and second turning diffractive optics disposed along the respective paths expand the image-bearing light beams of the first and second sets in a first dimension and direct the expanded image-bearing light beams of the first and second sets to first and second out-coupling diffractive optics. The first and second out-coupling diffractive optics further expand the image-bearing light beams of the two sets in a second dimension and direct the further expanded image-bearing light beams of the two sets from the waveguide toward the eyebox.

The embodiment of the invention relates to the technical field of optics, and in particular relates to an optical waveguide and a near-to-eye display system. The optical waveguide provided by the embodiment of the invention comprises a waveguide substrate, a coupling-in region, a coupling-out region and a light return region; the coupling-in region, the coupling-out region and the light return region are arranged on the waveguide substrate; the coupling-in region is used for coupling in a light beam with image information; the coupling-out region is used for coupling out the light beam with the image information; the light return region is used for reversely returning the light beam with the image information to the coupling-out region; the coupling-out region comprises at least three sideedges; at least one side edge of the coupling-out region is provided with the light return region; when an image light beam is propagated to the edge of the coupling-out region, part of the image light beam can be reversely propagated back to the coupling-out region due to the action of the light return region and then is coupled out to human eyes through the coupling-out region, and therefore the energy utilization rate of the two-dimensional expansion diffraction optical waveguide is increased.

The invention provides an image display method, near-to-eye display equipment and device, and relates to the technical field of optics. The image display method comprises the steps that a first FOV corresponding to each optical waveguide lens in multiple optical waveguide lenses of the near-to-eye display equipment is determined, and a second FOV of the near-to-eye display equipment is composed of first FOVs of the multiple optical waveguide lenses; for each optical waveguide lens, a grating parameter of a grating assembly of the optical waveguide lens is determined according to the first FOV; when an image source is displayed, incident light corresponding to the image source is diffracted according to the grating parameters, a plurality of first images are obtained, and the field angle of the image source is a second FOV; and the plurality of first images are spliced to obtain the second image corresponding to the image source, so that the plurality of first FOVs have no overlapped part by optimizing the grating parameters, the second image is ensured to have no ghosting, the uniformity of the second image is improved, and the eye movement range of the near-eye display equipment is expanded.

Display devices include waveguides with in-coupling optical elements that mitigate re-bounce of in-coupled light to improve overall in-coupling efficiency and/or uniformity. A waveguide receives light from a light source and/or projection optics and includes an in-coupling optical element that in-couples the received light to propagate by total internal reflection in a propagation direction within the waveguide. Once in-coupled into the waveguide the light may undergo re-bounce, in which the light reflects off a waveguide surface and, after the reflection, strikes the in-coupling optical element. Upon striking the in-coupling optical element, the light may be partially absorbed and/or out-coupled by the optical element, thereby effectively reducing the amount of in-coupled light propagating through the waveguide. The in-coupling optical element can be truncated or have reduced diffraction efficiency along the propagation direction to reduce the occurrence of light loss due to re-bounce of in-coupled light, resulting in less in-coupled light being prematurely out-coupled and/or absorbed during subsequent interactions with the in-coupling optical element.

The embodiment of the invention relates to the technical field of optics, in particular to a two-dimensional grating, an optical waveguide and AR glasses. The embodiment of the invention provides a two-dimensional grating, an optical waveguide and AR glasses. The two-dimensional grating comprises at least one period, on one hand, the proportion of the long side size to the short side size of the two-dimensional grating in each period increases the diversity of the light beam expansion propagation direction, and on the other hand, the grating structure and the size can be freely designed in each period, so that the design diversity is increased, the designed grating structure is applied to the optical waveguide and the AR glasses, and the problems of exit pupil uniformity and view field uniformity in the optical waveguide and the AR glasses are solved.

The invention belongs to quantum optics and optical communication systems, and particularly relates to a topological photonic crystal composite structure for realizing one-way transmission of light waves based on energy band inversion. A topological photonic crystal composite structure for realizing unidirectional transmission of light waves based on energy band inversion comprises two kinds of two-dimensional photonic crystals PhC1 and PhC2 with the same crystal lattice and the same type, and unidirectional transmission of light is realized on an interface of the two kinds of two-dimensionalphotonic crystals. According to the invention, the structure can realize unidirectional transmission of TM mode light, is immune to defects and impurities, and can provide a new thought for designinga novel optical waveguide for an efficient optical transmission problem.

The invention belongs to the technical field of optics, and discloses an infrared, laser and millimeter wave common-caliber three-mode seeker optical system. The system is composed of a hood, a primary mirror, a secondary mirror, a feed source, a waveguide, a millimeter wave transceiver module, an infrared channel, a laser channel and the like. The hood and the secondary mirror are designed to beequal in thickness, and the thickness values of the hood and the secondary mirror are optimized and calculated to ensure the lowest loss of millimeter waves. The secondary mirror is plated with a wide-spectrum medium reflecting film to reflect infrared and laser and transmit millimeter waves. The primary mirror is made of aluminum alloy, and the reflecting surface of the primary mirror is a paraboloid. The millimeter wave feed source is located between the secondary mirror and the hood, and the millimeter wave transceiver module is located at the rear end of the primary mirror and connected with the feed source through four waveguides. The infrared channel and the laser channel are located at the rear end of the primary mirror. Only the millimeter wave feed source is arranged at the secondary mirror so that the load can be reduced, and the stability of the system imaging quality can be effectively enhanced.

The present disclosure provides an optical waveguide design of a fiber modified with a thin layer of epsilon-near-zero (ENZ) material. The design results in an excitation of a highly confined waveguide mode in the fiber near the wavelength where permittivity of thin layer approaches zero. Due to the high field confinement within thin layer, the ENZ mode can be characterized by a peak in modal loss of the hybrid waveguide. Results show that such in-fiber excitation of ENZ mode is due to the coupling of the guided fundamental core mode to the thin-film ENZ mode. The phase matching wavelength, where the coupling takes place, varies depending on the refractive index of the constituents. These ENZ nanostructured optical fibers have many potential applications, for example, in ENZ nonlinear and magneto-optics, as in-fiber wavelength-dependent filters, and as subwavelength fluid channel for optical and bio-photonic sensing.

A waveguide apparatus for conveying a virtual image has first and second parallel planar surfaces. A first in-coupling diffractive optic on the first planar surface directs a first subset of image-bearing light beams into the waveguide and a second in-coupling diffractive optic on second planar surface directs a second subset of the image-bearing light beams into the waveguide. The first and second in-coupling diffractive optics are offset with respect to each other along the first and second parallel planar surfaces to independently direct the respective first and second subsets of the image-bearing light beams into the waveguide.

An augmented reality device includes a projector, projector optics optically coupled to the projector, and an eyepiece optically coupled to the projector optics. The eyepiece includes an eyepiece waveguide characterized by lateral dimensions and an optical path length difference as a function of one or more of the lateral dimensions.

The embodiment of the invention relates to the technical field of optics, and particularly relates to a grating structure, an optical waveguide and a near-to-eye display system. The embodiment of theinvention provides the grating structure which is applied to the optical waveguide and the near-to-eye display system. The grating structure comprises a grating body. A through hole is formed in the grating body, and compared with a cylindrical structure grating and a rhombus structure grating, the grating structure is more in adjustable parameters, high in design freedom degree and easy to adjustdiffraction efficiency of the grating so that the grating structure provided by the embodiment of the invention is better in diffraction efficiency.

An embodiment of the invention relates to the technical field of optics, in particular to a manufacturing method of a meta-structure surface coupling element. The manufacturing method of the meta-structure surface coupling element provided by the embodiment of the invention comprises the following steps of: matching the phase distribution of a required meta-structure surface coupling element witha preset structure database to obtain a target nano-structure unit, and acquiring a processing layout of the meta-structure surface coupling element according to the target nano-structure unit, wherein the preset structure database comprises at least two nanostructure units and phase response distribution diagrams corresponding to the nanostructure units; providing a substrate, and plating a layerof metal or dielectric material film on the substrate; coating a layer of photoresist on the film; performing photoetching, etching and photoresist removing according to the processing layout to obtain a template of the meta-structure surface coupling element; and impressing the template to the waveguide substrate to obtain the meta-structure surface coupling element. The meta-structure surface coupling element manufactured through adopting the manufacturing method can be applied to an optical waveguide, achromatism can be achieved, and the machining difficulty is low.

The embodiment of the invention relates to the technical field of optics. The invention discloses a depth-of-field adjusting method and device capable of achieving multiple depths of field and binocular near-to-eye display equipment. The device comprises a display device used for outputting a display image and a waveguide sheet used for receiving the display image and outputting a virtual image visible to human eyes according to the display image. The display image is coupled into the waveguide sheet in the form of light; the virtual image is coupled out from the optical waveguide in the formof light. The method comprises the steps of firstly obtaining a preset adjustment value of the depth of field of a virtual image, calculating a binocular center sight included angle of the binocular near-to-eye display equipment according to the preset adjustment value, determining an included angle between coupled-out light and the waveguide sheet according to the binocular center sight includedangle to determine an included angle between coupled-in light and the waveguide sheet, and finally adjusting the included angle between the coupled-in light and the waveguide sheet to enable the depthof field of a virtual image to be adjusted to the preset adjustment value.

The invention provides a micro-nano optical fiber-waveguide-superconducting nanowire single-photon detector and a preparation method thereof. A micro-nano optical fiber fixed in a V-shaped groove can realize high-precision optical coupling alignment with a waveguide, and the transition section, which becomes thin from thick, of the micro-nano optical fiber is suspended, so that light is prevented from leaking to a substrate, and the loss in the optical transmission process is further reduced; the waveguide type superconducting nanowire structure can completely absorb light on a chip; due to the design of the corner waveguide, an optical coupling area of the micro-nano optical fiber-waveguide can be completely separated from an optical detection area of the waveguide type superconducting nanowire structure, dark counting caused by background radiation propagating along the optical fiber can be effectively reduced, and the influence of the background dark counting on optical detection is reduced; according to the invention, a single-photon detector integrating high detection efficiency, high counting rate, low time jitter and low dark counting can be realized, and the detector is expected to play a role in the fields of light quantum information processing, quantum optics and the like.

Exemplary apparatus, systems, methods of making, and methods of using a rotary junction are provided. A rotary junction having multiple channels is provided herein. The rotary junction has a first coupling optic and a second coupling optic where the rotating optical fiber or other waveguide comping from the first coupling optic passes through the second coupling optics.

The invention discloses a rod-shaped microstructure optical fiber, and belongs to the technical field of optics and laser photoelectrons. An anti-resonance cladding, an air region, an outer cladding and a fiber core region are included. The anti-resonance cladding is formed by axially and parallelly enclosing a plurality of hollow-core capillaries into a circle, the inner part of the anti-resonance cladding is a fiber core region, the outer part of the anti-resonance cladding is an outer cladding, each hollow-core capillary of the anti-resonance cladding is parallelly connected with the inner side surface of the outer cladding, and the inner part of each hollow-core capillary is the air region; and gaps are formed among the hollow-core capillaries. The thickness of the outer cladding is millimeter-scale thickness, and the high mechanical strength can be achieved by omitting the process step of coating in a drawing process so that the optical fiber can provide a stable and perfect waveguide system which is not influenced by bending and an external stress. And more structures are additionally arranged in the external cladding so that different functions are realized.