California Institute of Technology

Alexander D White

Seyed Ali Hajimiri

Parham Porsandeh Khial

Seyed Mohammadreza Fatemi

Aroutin Khachaturian

A lens-less imaging device, includes, in part, a multitude of pixels each having a light detector and an associated optical element adapted to cause the pixel to be responsive to a different direction of light received from a target. Each pixel has a field of view that overlaps with a field of view of at least a subset of the remaining pixels. The optical element may be a transparent dielectric element, a transparent MEMS component, a transparent microlens, or include one or more metallic walls. The optical element may be a continuous mapping layer formed over the pixels. Each pixel may or may not have a Gaussian distribution response. The lens-less imaging device forms an image of a target in accordance with an optical transfer functions of the pixels as well as responses of the pixels to the light received from the target.

Ultra-thin planar lens-less camera

A lens-less 3-D imaging device includes, in part, a multitude of optical receiving elements positioned along a concave or flat surface defining a focal zone of the imaging device. Each optical receiving element has a field of view that overlaps with a field of view of a number of other optical receiving elements. The optical receiving elements may optionally be grating couplers or photo detectors. The optical receiving elements may be disposed on a circuit board. The circuit board may be flexible and include control circuitry configured to form the image in accordance with the received responses of the optical receiving elements and further in accordance with the optical transfer functions of the of optical receiving elements. The circuit boards may include one or more flex sensors or strain gauges adapted to determine their curvatures.

Lensless 3-dimensional imaging using directional sensing elements

An optical gyroscope includes, in part, an optical switch, a pair of spiral optical rings and a pair of photodetectors. The optical switch supplies a laser beam. The first spiral optical ring delivers a first portion of the beam in a clockwise direction during the first half of a period, and a first portion of the beam in a counter clockwise direction during the second half of the period. The second spiral optical ring delivers a second portion of the beam in a counter clockwise direction during the first half of the period, and a second portion of the beam in a clockwise direction during the second half of the period. The first photodetector receives the beams delivered by the first and second optical rings during the first half of the period. The second photodetector receives the beams delivered by the first and second optical rings during the second half of the period.

Interlaced spiral optical gyroscope

A communicate device includes transmitters and a receiver. The first transmitter is coupled to a first 90&#xb0; phase shifter that is also coupled to a first antenna, and to a second 90&#xb0; phase shifter that is also coupled to a first node. The second transmitter is coupled to a third 90&#xb0; phase shifter that is also coupled to a second antenna, and to a fourth 90&#xb0; phase shifter that is also coupled to the first node. The receiver is coupled to a fifth 90&#xb0; phase shifter that is also coupled to the first antenna, and to a sixth 90&#xb0; phase shifter that is also coupled to the second antenna. A non-reciprocal element, coupled between the receiver and the first node, provides a 90&#xb0; phase shift from the receiver to the first node and a &#x2212;90&#xb0; phase shift from the first node to the receiver.

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Pasadena, CA, United States of America

Alexander D White