An optic having a refractive-index gradient comprises first and second materials. The first material includes at least one nanoparticle species and has a first volume-fraction profile and a first refractive index n.sub.1(λ) varying in dependence on wavelength λ. The second material includes at least one polymer species and has a second volume-fraction profile and a second refractive index n.sub.2(λ) varying in dependence on the wavelength λ. The first and second volume-fraction profiles define the refractive-index gradient of the optic, where, for a longer wavelength λ.sub.R and a shorter wavelength λ.sub.B: n.sub.1(λ.sub.B)−n.sub.2(λ.sub.B) and n.sub.1(λ.sub.R)−n.sub.2(λ.sub.R) differ by less than a threshold T that limits optical power in the optic.

A transparent ultrasound transducer device for multi-mode optical imaging on a target is provided. The device includes a transparent piezoelectric transducer, one or more wires, and an optical lens. The transparent piezoelectric transducer of a first acoustic impedance is configured to receive acoustic waves from the target. The transparent piezoelectric transducer has a first surface and a second surface. The first surface and the second surface are coated with transparent electrically conductive coatings. The optical lens is contacted with and optically coupled to the first surface of the transparent piezoelectric transducer. The optical lens is made of a material with a second acoustic impedance, and the first and second acoustic impedances are substantially similar to minimize an acoustic impedance mismatch such that sensitivity of the device is improved.

A restraint system (10) for helping to protect an occupant (60) of a vehicle (20) having a seat (50) for the occupant (60) includes a primary airbag (70) having a stored condition within the roof (32) and being inflatable to a deployed condition extending into the cabin (40) on a first side of the seat (50). A support airbag (76) has a stored condition within the roof (32) and is inflatable to a deployed condition on a second side of the seat (50) opposite the first side. Tethers (120) connect the primary airbag (70) and the support airbag (76) such that occupant (60) penetration into the primary airbag (70) pulls the support airbag (76) into engagement with the seat (50).

An optical imaging lens assembly includes at least one optical lens element. The optical lens element includes an anti-reflective coating, and the anti-reflective coating is arranged on at least one surface of the optical lens element. The anti-reflective coating includes a high-low refractive coating and a gradient refractive coating, and the high-low refractive coating is arranged between the optical lens element and the gradient refractive coating. The high-low refractive coating includes at least one high refractive coating layer and at least one low refractive coating layer, which are stacked in alternations. The low refractive coating layer is in contact with the optical lens element. The gradient refractive coating includes a plurality of holes, and the holes away from the optical lens element are relatively larger than the holes close to the optical lens element.

An embodiment apparatus comprises an optically transparent substrate having first and second surfaces; a piezoelectric membrane, arranged at the first surface, that oscillates in response to a light beam propagated through the substrate; at least one reflective facet facing the substrate and arranged at the piezoelectric membrane; and an optical element receiving the light beam at an input end and guiding the light beam towards an output end coupled to the second surface. The optical element incorporates a light focusing path focusing the light beam at a focal point at the piezoelectric membrane, and at least one light collimating path collimating the light beam onto the at least one reflective facet. The optical element guides light reflected from the at least one reflective facet to the input end, the reflected light indicating a position of the optical element with respect to the focal point.

An optical tissue imaging system includes a probe for insertion into a transparent cylindrical capillary. The capillary includes an internal cylindrical channel that extends along a central axis. The capillary is inserted into tissue of a subject, and the probe may rotate and translate within the capillary. The probe may include a mirror configured to reflect light to the tissue outside of the cylindrical capillary.

A nanocomposite ink refractive gradient optic with variable focus optic comprising a first optical element, a second optical element, each the optical elements comprised of a cured nanocomposite ink wherein the first and second optical element have a cubic volumetric gradient complex optical index such that when arranged in tandem along an optical axis the optical power varies based on linear translation with respect to another.

A time of flight (ToF) camera according to embodiments of the present invention includes a light source unit including an infrared light-emitting device array and configured to generate a light signal; a lens unit disposed on the light source unit and including a plurality of lenses; and an adjustment unit configured to adjust the lens unit such that a light pattern of the light signal, which has passed through the lens unit, becomes a surface lighting or a spot lighting including a plurality of spot patterns, wherein the lens unit has a distortion aberration in the form of barrel distortion in which irradiance of the light pattern decreases in a direction away from a central portion.

The present disclosure discloses an optical ink matrix comprising a UV polymerizable monomer, at least a first multifunctional monomer. The optical ink matrix may further comprise a second multifunctional monomer. The present disclosure further discloses a method of manufacturing non-axially symmetric GRIN lens using 3D printing.

System, methods, and other embodiments described herein relate to an improved camera system including directional optics to estimate the depth of grayscale and color images. In one embodiment, a camera system includes a graded lens to receive light associated with a scene and resolve multiple angles of the light according to parameters of the graded lens. The camera system also includes a detector that senses the light from the graded lens per pixel to integrate multiple views of the scene into a single image to estimate depth associated with objects and the single image includes data for views of the objects that overlap having resolved angles in association with the parameters.