Light concentrating device for optical sensing systems
AssigneeBeijing Voyager Technology Co., Ltd.
InventorsYue Lu, Youmin Wang
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Abstract
Embodiments of the disclosure provide an optical sensing device for a receiver in an optical sensing system. The optical sensing device includes a light concentrator configured to collect a light beam. The light concentrator includes an input aperture configured to collect the light beam, an output aperture configured to output the light beam, and a side surface in contact with the input aperture and the output aperture. The side surface is configured to reflect the collected light beam towards the output aperture. The optical sensing device also includes a photodetector placed behind the light concentrator. The photodetector is configured to receive the light beam collected through the output aperture and convert the light beam to an electrical current.
Claims17
An optical sensing device for a receiver in an optical sensing system, comprising:
- a light concentrator configured to collect a light beam, wherein the light concentrator comprises:
- an input aperture configured to collect the light beam;
- an output aperture configured to output the light beam;
- and
- a side surface in contact with the input aperture and the output aperture, configured to reflect the collected light beam towards the output aperture,
- wherein a gain number of the light concentrator is in a range between about 1.5 and about 2.5, the gain number being equal to a ratio of an area of the input aperture over an area of the photodetector;
- and
- a single photon avalanche diode (SPAD) chip comprising a photodetector, wherein the photodetector is placed behind the light concentrator, wherein the photodetector is configured to receive the light beam collected through the output aperture and convert the light beam to an electrical current, and wherein the light concentrator is bonded to the SPAD chip through eutectic bonding.
An optical sensing device for a receiver in an optical sensing system, comprising:
- an array of light concentrators configured to collect a light beam for an array of photodetectors, each of the light concentrators being over a respective photodetector, wherein each light concentrator comprises:
- an input aperture configured to collect the light beam,
- a side surface surrounding the input aperture, configured to reflect the light beam towards an output aperture, and
- an output aperture configured to output the light beam,
- wherein a gain number of each of the light concentrators is in a range between about 1.5 and about 2.5, the gain number being equal to a ratio of an area of the input aperture over an area of the photodetector, and
- a single photon avalanche diode (SPAD) chip comprising an array of photodetectors, wherein the array of photodetectors are placed behind the array of light concentrators, wherein the photodetectors are each configured to receive the light beam collected through the output aperture and convert the light beam to an electrical current, and wherein the array of light concentrators is bonded to the SPAD chip through eutectic bonding.
An optical sensing system, comprising:
- a transmitter configured to transmit a light beam towards an object;
- and
- a receiver configured to receive the light beam returned from the object and convert the light beam to an electric current, wherein the receiver comprises:
- an array of light concentrators configured to collect a light beam for an array of photodetectors, each of the light concentrators being over a respective photodetector, wherein each light concentrator comprises:
- an input aperture configured to collect the light beam,
- a side surface surrounding the input aperture, configured to reflect the light beam towards an output aperture, and
- an output aperture configured to output the light beam,
- wherein a gain number of each of the light concentrators is in a range between about 1.5 and about 2.5, the gain number being equal to a ratio of an area of the input aperture over an area of the photodetector, and
- a single photon avalanche diode (SPAD) chip comprising an array of photodetectors, wherein the array of photodetectors are placed behind the light concentrators, wherein the photodetectors are each configured to receive the light beam collected through the output aperture, and wherein the array of light concentrators is bonded to the SPAD chip through eutectic bonding.
Dependencies are inferred from the claim text.