Abstract:
Provided are optical modulators and devices including the optical modulators. The optical modulator may include an optical modulation layer that includes a phase change material. A first electrode may be provided on a first surface of the optical modulation layer. A second electrode may be provided on a second surface of the optical modulation layer. A first phase controlling layer may be provided, the first electrode being disposed between the first phase controlling layer and the optical modulation layer. A second phase controlling layer may be provided, the second electrode being disposed between the second phase controlling layer and the optical modulation layer. Each of the first and the second phase controlling layers may have an optical thickness corresponding to an odd multiple of λ/4, where λ is a wavelength of incident light to be modulated by the optical modulator. The optical modulator may further include at least one reflective layer. The optical modulation layer may have a thickness of about 10 nm or less. An operating voltage of the optical modulator may be about 10 V or less.
Abstract:
Provided are non-uniform light-emitting lidar (light detection and ranging) apparatuses and autonomous robots including the same. A lidar apparatus may include a light source configured to emit light, an optical unit arranged on an optical path of light emitted from the light source and configured to change an optical profile of the light to be non-uniform, and a 3D sensor configured to sense location of an object by receiving reflection light from the object.
Abstract:
A method of acquiring distance information is provided. The method includes determining a projecting order of different projected lights to be sequentially projected onto an object, based on a position of the object and/or an external input, sequentially projecting the different projected lights onto the object in the determined projecting order, obtaining modulated reflected lights by modulating the reflected lights reflected by the object; and acquiring information about a distance between the device and the object based on the modulated reflected lights.
Abstract:
An apparatus and a method for acquiring depth information are disclosed. To acquire depth information, illumination light of which an amount of light has been modulated by a modulation signal is emitted towards a subject, and an image is captured using an image sensor. An image signal is sequentially acquired from a plurality of rows while shifting a phase of the illumination light at a start exposure time of a row belonging to an intermediate region of a pixel array region of the image sensor. Depth information is calculated from image signals acquired during a plurality of frames while shifting a phase of the modulation signal.
Abstract:
A depth image measuring camera includes an illumination device configured to irradiate an object with light, and a light-modulating optical system configured to receive the light reflected from the object. The depth image measuring camera includes an image sensor configured to generate an image of the object by receiving light incident on the image sensor that passes through the light-modulating optical system. The light-modulating optical system includes a plurality of lenses having a same optical axis, and an optical modulator configured to operate in two modes for measuring a depth of the object.
Abstract:
A three-dimensional (3D) image sensor device and an electronic apparatus including the 3D image sensor device are provided. The 3D image sensor device includes: a shutter driver that generates a driving voltage of a sine wave biased with a first bias voltage, from a loss-compensated recycling energy; an optical shutter that varies transmittance of reflective light reflected from a subject, according to the driving voltage, and modulates the reflective light to generate at least two optical modulation signals having different phases; and an image generator that generates 3D image data for the subject which includes depth information calculated based on a phase difference between the at least two optical modulation signals.
Abstract:
A depth image acquisition apparatus and a method of acquiring depth information are provided. The method of acquiring depth information includes: sequentially projecting, to a subject, N different beams of light emitted from a light source for a time period including an idle time for each of the N different beams of transmitted light, where N is a natural number that is equal to or greater than 3; modulating, using a light modulation signal, beams of reflected light that are obtained by reflection of the N different beams from the subject; obtaining N phase images corresponding to the N different beams of light by capturing, using a rolling shutter method, the modulated beams of reflected light; and obtaining depth information by using the obtained N phase images.
Abstract:
Disclosed is a light modulating apparatus. The light modulating apparatus includes a pixel array including a plurality of pixels, a light modulating device that absorbs or transmit light incident on the pixel array according to an applied voltage, a flip-flop circuit that outputs a first voltage based on a device driving signal indicating a level of a second voltage applied to be applied to the light modulating device, and an amplifier that amplifies the first voltage to generate the second voltage and applies the second voltage to the light modulating device.
Abstract:
A transmissive optical shutter and a method of fabricating the same are provided. The transmissive optical shutter includes a first contact layer, an epitaxial layer disposed over the first contact layer, the epitaxial layer being configured to modulate intensity of incident light having a specific wavelength, a second contact layer disposed on the epitaxial layer, a first electrode disposed on the first contact layer, at least one second electrode disposed on the second contact layer, and a substrate disposed under the first contact layer.
Abstract:
An optical device includes an active layer that includes at least two outer barriers and at least one coupled quantum well that is inserted between the at least two outer barriers. Each coupled quantum well includes at least three quantum well layers and at least two coupling barriers that are respectively provided between the at least three quantum well layers. Thicknesses of two quantum well layers disposed at opposite end portions of the at least three quantum well layers are less than a thickness of the other quantum well layer disposed between the two quantum well layers disposed at the opposite end portions. A bandgap of the two quantum well layers disposed at the opposite end portions may be higher than a bandgap of the other quantum well layer disposed between the two quantum well layers.