Abstract:
A fiber optic sensor for detecting the presence or concentration of particular chemical or biological species in a zone to be monitored has light-emitting and detecting elements such as a gallium arsenide light-emitting diode and a Schottky diode light detector provided in a semiconductor body, and has an optical fiber formed in situ on a surface of the body to conduct light from the light-emitting diode to the detector. The fiber has a long light-transmitting core of a material such as silicon dioxide deposited on a semiconductor body surface and defined by photolithographic techniques and has a cladding deposited over and around the core of a material of relatively lower refractive index than the core. The cladding material reacts when contacted by the particular chemical or biological species to produce measurable changes in transmission of light through the fiber so that the detector provides an electrical signal representative of the presence or concentration of the species.
Abstract:
A method may include determining a thermal signal for a thermal analysis of a rock sample. The method may further include transmitting various commands to various thermal sources to produce various heat emissions. A respective command among the commands may cause a respective thermal source among the thermal sources to produce a respective heat emission based on the thermal signal. The method further includes determining distributed temperature data of the rock sample using various distributed temperature sensors in response to producing the heat emissions. The distributed temperature sensors may be coupled to the rock sample on a first rock surface and a second rock surface. The first rock surface may be on an opposite side of the rock sample from the second rock surface. The method may further include determining predicted thermal property data of the rock sample using the distributed temperature data and a machine-learning model.
Abstract:
A lab-on-a-chip system (100) comprises an optical detection waveguide (122) that has an at least partially periodic structure (123, 501, 502, 503, 504) that is configured to couple light (152) from surroundings of the optical detection waveguide (122) into the optical detection waveguide (122). The lab-on-a-chip system (100) furthermore also comprises a microfluidic network (212), wherein the microfluidic network (212) has multiple lines and at least one reaction chamber (211, 211-1, 211-2, 211-3).
Abstract:
A semiconductor structure includes a first optical waveguide and a second optical waveguide located on a sapphire substrate. The first optical waveguide and the second optical waveguide each include a core portion of gallium nitride (GaN), and a cladding layer laterally surrounding the core portion. The cladding layer includes a material having a refractive index less than a refractive index of the sapphire substrate.
Abstract:
Arrays of integrated analytical devices and their methods for production are provided. The arrays are useful in the analysis of highly multiplexed optical reactions in large numbers at high densities, including biochemical reactions, such as nucleic acid sequencing reactions. The devices allow the highly sensitive discrimination of optical signals using features such as spectra, amplitude, and time resolution, or combinations thereof. The devices include an integrated diffractive beam shaping element that provides for the spatial separation of light emitted from the optical reactions.
Abstract:
Arrays of integrated analytical devices and their methods for production are provided. The arrays are useful in the analysis of highly multiplexed optical reactions in large numbers at high densities, including biochemical reactions, such as nucleic acid sequencing reactions. The integrated devices allow the highly sensitive discrimination of optical signals using features such as spectra, amplitude, and time resolution, or combinations thereof. The arrays and methods of the invention make use of silicon chip fabrication and manufacturing techniques developed for the electronics industry and highly suited for miniaturization and high throughput.
Abstract:
A chip-scale, reusable sensor can detect aromatic hydrocarbons, such as benzene, toluene, ethylbenzene, and xylenes (BTEX), rapidly in water without sample preparation. The device is capable of real-time, continuous monitoring for BTEX solutes, which diffuse into a film, such as a polymer, on the sensors surface. In operation, BTEX analytes concentrate in the film, causing an increase in refractive index, which modulates evanescent coupling into the chips integrated photodetector array. Integration of the photodetector array simplifies system instrumentation and permits incorporation of an on-chip photocurrent reference region in the immediate vicinity of the sensing region, reducing drift due to temperature fluctuations. In some examples, the chip responds linearly for BTEX concentrations between 1 ppm and 30 ppm, with a limit of detection of 359 ppb, 249 ppb, and 103 ppb for benzene, toluene, and xylene in water, respectively.
Abstract:
A method of forming a semiconductor structure includes forming a first optical waveguide and a second optical waveguide on a sapphire substrate. The first optical waveguide and the second optical waveguide each include a core portion of gallium nitride (GaN), and a cladding layer laterally surrounding the core portion. The cladding layer includes a material having a refractive index less than a refractive index of the sapphire substrate. The method further includes etching a portion of the cladding layer to form a microfluidic channel therein and forming a capping layer on a top surface of the first optical waveguide, the second optical waveguide and the microfluidic channel.
Abstract:
A method of forming a semiconductor structure includes forming a first optical waveguide and a second optical waveguide on a sapphire substrate. The first optical waveguide and the second optical waveguide each include a core portion of gallium nitride (GaN), and a cladding layer laterally surrounding the core portion. The cladding layer includes a material having a refractive index less than a refractive index of the sapphire substrate. The method further includes etching a portion of the cladding layer to form a microfluidic channel therein and forming a capping layer on a top surface of the first optical waveguide, the second optical waveguide and the microfluidic channel.
Abstract:
Arrays of integrated analytical devices and their methods for production are provided. The arrays are useful in the analysis of highly multiplexed optical reactions in large numbers at high densities, including biochemical reactions, such as nucleic acid sequencing reactions. The integrated devices allow the highly sensitive discrimination of optical signals using features such as spectra, amplitude, and time resolution, or combinations thereof. The arrays and methods of the invention make use of silicon chip fabrication and manufacturing techniques developed for the electronics industry and highly suited for miniaturization and high throughput.