Abstract:
Configurations for an optical system used for guiding light and reducing back-reflection back in an output waveguide is disclosed. The optical system may include an output waveguide defined in a slab waveguide. The output waveguide may terminate before an output side of the slab waveguide, which may reduce the back-reflection of light from the output side back into the output waveguide. The output side may define an optical element that may steer the output light. The optical element may collimate the output light, cause the output light to converge, or cause the output light to diverge.
Abstract:
An electromagnetic radiation detector pixel includes a set of epitaxial layers and a lens. The set of epitaxial layers defines an electromagnetic radiation absorber. The lens is directly bonded to the set of epitaxial layers.
Abstract:
Various embodiments disclosed herein describe optical measurement systems for characterizing a sample. The optical measurement systems may selectively emit light from different numbers of launch groups, and may include a multi-stage optical switch network that may be controlled to route light to a desired number of launch groups. The optical measurement systems may further measure light using a corresponding number of detector groups. The optical measurement systems may perform measurements using a plurality of different wavelengths, where different groups of these wavelengths may be measured using different numbers of launch groups (as well as corresponding detector groups).
Abstract:
A photonic integrated circuit as discussed herein may include one or more multimode waveguide interfaces that define a corresponding transition between a waveguide and a free propagation region of a photonic integrated circuit. Specifically, a multimode waveguide interface may include an input waveguide that is connected to an interferometric waveguide, and a slab waveguide connected to the interferometric waveguide. The input waveguide and interferometric waveguide are positioned and configured to convert a portion of a first mode of light into a second mode of light, such that the first and second modes interfere within the interferometric waveguide. The interferometric waveguide is configured such that these modes are in phase for a first target wavelength and out of phase for a second target wavelength at an interface between the interferometric waveguide and the slab waveguide.
Abstract:
An illuminator/collector assembly can deliver incident light to a sample and collect return light returning from the sample. A sensor can measure ray intensities as a function of ray position and ray angle for the collected return light. A ray selector can select a first subset of rays from the collected return light at the sensor that meet a first selection criterion. In some examples, the ray selector can aggregate ray intensities into bins, each bin corresponding to rays in the collected return light that traverse within the sample an estimated optical path length within a respective range of optical path lengths. A characterizer can determine a physical property of the sample, such as absorptivity, based on the ray intensities, ray positions, and ray angles for the first subset of rays. Accounting for variations in optical path length traversed within the sample can improve accuracy.
Abstract:
Embodiments are directed to optical measurement systems that utilize multiple emitters to emit light during a measurement, as well as methods of performing measurements using these optical measurement systems. The optical measurement systems may include a light generation assembly that is configured to generate light via a light source unit, and a photonic integrated circuit that includes a launch group having a plurality of emitters. Each of these emitters is optically coupled to the light generation assembly to receive light generated from the light generation assembly, and may emit this light from a surface of the photonic integrated circuit. The optical measurement system may perform a measurement in which the light generation assembly generates light and each of the plurality of emitters simultaneously emit light received from the light generation assembly.
Abstract:
Various embodiments disclosed herein describe optical measurement systems for characterizing a sample. The optical measurement systems may selectively emit light from different numbers of launch groups, and may include a multi-stage optical switch network that may be controlled to route light to a desired number of launch groups. The optical measurement systems may further measure light using a corresponding number of detector groups. The optical measurement systems may perform measurements using a plurality of different wavelengths, where different groups of these wavelengths may be measured using different numbers of launch groups (as well as corresponding detector groups).
Abstract:
An illuminator/collector assembly (104) can deliver incident light (106) to a sample (102) and collect return light (112) returning from the sample (102). A sensor (114) can measure ray intensities as a function of ray position and ray angle for the collected return light (112). A ray selector (116) can select a first subset of rays from the collected return light (112) at the sensor (114) that meet a first selection criterion. In some examples, the ray selector (116) can aggregate ray intensities into bins, each bin corresponding to rays in the collected return light (112) that traverse within the sample (102) an estimated optical path length within a respective range of optical path lengths. A characterizer can determine a physical property of the sample (102), such as absorptivity, based on the ray intensities, ray positions, and ray angles for the first subset of rays. Accounting for variations in optical path length traversed within the sample (102) can improve accuracy.
Abstract:
The disclosure relates to embodiments of optical measurement systems that are configured to perform spectroscopic measurements. The optical measurement systems are configured to provide compact arrangements for introducing light into a sample and collecting light returned from the sample. Reducing the size of the launch and/or collection architecture of an optical measurement system may make the overall optical measurement system smaller, thereby providing flexibility in integrating an optical measurement system into various form factors.