Abstract: A magnetometer with responsive material is provided that includes a PT symmetric assembly. The PT symmetric assembly includes gain material and responsive material that are positioned to achieve PT symmetry. The responsive material is configured to shift a resonance frequency of point defects in response to a magnetic field. A microwave antenna is configured to generate a microwave field of varying frequencies that engage the responsive material. A controller is configured to adjust a tunable laser source that is input into the PT symmetric assembly based on an output of the PT symmetric assembly to cause a gain generated by the gain material to match a loss caused by the responsive material. The controller is further configured to determine a strength of the magnetic field by determining one of a deviation from the exceptional point and an amplitude of the gain needed to reach the exceptional point.

Abstract: A magnetometer with responsive material is provided that includes a PT symmetric assembly. The PT symmetric assembly includes gain material and responsive material that are positioned to achieve PT symmetry. The responsive material is configured to shift a resonance frequency of point defects in response to a magnetic field. A microwave antenna is configured to generate a microwave field of varying frequencies that engage the responsive material. A controller is configured to adjust a tunable laser source that is input into the PT symmetric assembly based on an output of the PT symmetric assembly to cause a gain generated by the gain material to match a loss caused by the responsive material. The controller is further configured to determine a strength of the magnetic field by determining one of a deviation from the exceptional point and an amplitude of the gain needed to reach the exceptional point.

Abstract: Among other embodiments, a method for generated entangled photons is disclosed. The method comprises generating photons in a fundamental mode and converting the photons from the fundamental mode to a higher-order mode. The method further comprises generating, by a Bragg resonator configured to receive the photons, entangled photons in the fundamental mode from the converted photons in the higher-order mode. The method further comprises outputting the generated entangled photons from the Bragg resonator.

Abstract: Systems for an integrated photonic responsive material sensor are described herein. In certain embodiments, a system includes a carrier wafer that includes a cavity formed in the carrier wafer. The carrier wafer also includes a responsive waveguide coupled to the cavity, the responsive waveguide formed from responsive material responsive to a force by shifting a resonance frequency of point defects in the responsive material in response to the force, wherein a pump light is directed to the responsive waveguide to prepare the responsive waveguide to absorb a probe light when exposed to a radio frequency at the point defect resonance frequency. Additionally, the system includes components coupled to the carrier wafer, wherein the components include a probe light source that generates the probe light, wherein the components are positioned in relation to the carrier wafer to couple the probe light into the cavity.

Abstract: A photonics device for threshold magnetometry includes an absorbent material with nonlinear optical susceptibility, such as a diamond material with nitrogen vacancy defects, that is disposed in an optical resonator. The optical resonator receives light from an input source and includes nonlinear optical properties that enable the resonator to undergo a nonlinear photon generation process at a certain threshold power level to generate photons at distinct frequencies from the input light. The absorbent material absorbs photons entering the resonator when excited, which causes the threshold power level to shift as a function of the absorption. This may cause the optical resonator to stop generating photons via the nonlinear photon generation process and output a change in power. The change in power can be used to determine the characteristics of a present magnetic field.

Abstract: A photonics device for threshold magnetometry includes an absorbent material with nonlinear optical susceptibility, such as a diamond material with nitrogen vacancy defects, that is disposed in an optical resonator. The optical resonator receives light from an input source and includes nonlinear optical properties that enable the resonator to undergo a nonlinear photon generation process at a certain threshold power level to generate photons at distinct frequencies from the input light. The absorbent material absorbs photons entering the resonator when excited, which causes the threshold power level to shift as a function of the absorption. This may cause the optical resonator to stop generating photons via the nonlinear photon generation process and output a change in power. The change in power can be used to determine the characteristics of a present magnetic field.

Abstract: Systems and method for the delivery of a pump laser using optical diffraction are described herein. In certain embodiments, a system includes a substrate and a waveguide layer formed on the substrate. The waveguide layer includes a first waveguide of a first material configured to receive a probe laser for propagating within the first waveguide. The waveguide layer additionally includes a second waveguide configured to receive a pump laser for propagating within the second waveguide. Further, the waveguide layer includes one or more diffractors configured to direct a portion of the pump laser out of the second waveguide and through the first waveguide.

Abstract: Systems for an integrated photonic responsive material sensor are described herein. In certain embodiments, a system includes a carrier wafer that includes a cavity formed in the carrier wafer. The carrier wafer also includes a responsive waveguide coupled to the cavity, the responsive waveguide formed from responsive material responsive to a force by shifting a resonance frequency of point defects in the responsive material in response to the force, wherein a pump light is directed to the responsive waveguide to prepare the responsive waveguide to absorb a probe light when exposed to a radio frequency at the point defect resonance frequency. Additionally, the system includes components coupled to the carrier wafer, wherein the components include a probe light source that generates the probe light, wherein the components are positioned in relation to the carrier wafer to couple the probe light into the cavity.

Abstract: A nonlinear wave mixing system with grating assisted phase matching is provided. The system includes a pump laser and a nonlinear waveguide. The pump laser is used to generate pump light at a select wavelength. The nonlinear waveguide is configured to generate produced light from the pump light that is directed into the nonlinear waveguide. The nonlinear waveguide includes at least one backward grating that is configured to diffract the produced light in a backward direction relative to a direction the produced light travels in the nonlinear waveguide to reach the backward grating. The backward grating having a grating momentum that generates counter-propagating phase matching in the produced light.

Abstract: A nonlinear wave mixing system with grating assisted phase matching is provided. The system includes a pump laser and a nonlinear waveguide. The pump laser is used to generate pump light at a select wavelength. The nonlinear waveguide is configured to generate produced light from the pump light that is directed into the nonlinear waveguide. The nonlinear waveguide includes at least one backward grating that is configured to diffract the produced light in a backward direction relative to a direction the produced light travels in the nonlinear waveguide to reach the backward grating. The backward grating having a grating momentum that generates counter-propagating phase matching in the produced light.

Abstract: A nonlinear wave mixing system with grating assisted phase matching is provided. The system includes a pump laser and a nonlinear waveguide. The pump laser is used to generate pump light at a select wavelength. The nonlinear waveguide is configured to generate produced light from the pump light that is directed into the nonlinear waveguide. The nonlinear waveguide includes at least one backward grating that is configured to diffract the produced light in a backward direction relative to a direction the produced light travels in the nonlinear waveguide to reach the backward grating. The backward grating having a grating momentum that generates counter-propagating phase matching in the produced light.

Abstract: An optical device comprises a waveguide core layer that includes a planar lens structure having a first end and a second end, with the planar lens structure including a plurality of lens tapers extending from at least one of the first or seconds ends in a convex-shaped array. The waveguide core layer also includes a waveguide slab that adjoins with the planar lens structure, such that the waveguide slab is in optical communication with the plurality of lens tapers. The plurality of lens tapers are configured to adiabatically transition an index of refraction from a first index value, external to the planar lens structure, to a second index value, internal to the planar lens structure.

Abstract: Systems and method for the delivery of a pump laser using optical diffraction are described herein. In certain embodiments, a system includes a substrate and a waveguide layer formed on the substrate. The waveguide layer includes a first waveguide of a first material configured to receive a probe laser for propagating within the first waveguide. The waveguide layer additionally includes a second waveguide configured to receive a pump laser for propagating within the second waveguide. Further, the waveguide layer includes one or more diffractors configured to direct a portion of the pump laser out of the second waveguide and through the first waveguide.

Abstract: An optical device comprises a waveguide core layer that includes a planar lens structure having a first end and a second end, with the planar lens structure including a plurality of lens tapers extending from at least one of the first or seconds ends in a convex-shaped array. The waveguide core layer also includes a waveguide slab that adjoins with the planar lens structure, such that the waveguide slab is in optical communication with the plurality of lens tapers. The plurality of lens tapers are configured to adiabatically transition an index of refraction from a first index value, external to the planar lens structure, to a second index value, internal to the planar lens structure.

Abstract: A method for fiber-to-chip coupling is disclosed. The method comprises providing a photonic integrated circuit (PIC) that includes a substrate, a cladding layer on the substrate, and at least one waveguide embedded in the cladding layer, wherein the at least one waveguide has a waveguide interface. An optical fiber is positioned adjacent to the PIC, wherein the optical fiber has a fiber interface, and the fiber interface is aligned with the waveguide interface. A flowable inorganic oxide in liquid form is added to an area between the fiber interface and the waveguide interface. Thereafter, heat is applied to the area between the fiber interface and the waveguide interface for a period of time to cure the inorganic oxide, such that the optical fiber is coupled to the PIC. The cured inorganic oxide has a refractive index that substantially matches the refractive indices of the cladding layer and the optical fiber.

Abstract: Among other embodiments, a method for generated entangled photons is disclosed. The method comprises generating photons in a fundamental mode and converting the photons from the fundamental mode to a higher-order mode. The method further comprises generating, by a Bragg resonator configured to receive the photons, entangled photons in the fundamental mode from the converted photons in the higher-order mode. The method further comprises outputting the generated entangled photons from the Bragg resonator.

Abstract: Improved architectures and related methods for enhancing entangled photon generation in optical systems are described. Photons from a light source are coupled from the fundamental mode into an optical resonator in a higher-order mode. The optical resonator comprises a photon generation portion configured to generate entangled photons from the coupled photons. The entangled photons are selectively extracted from the optical resonator in the fundamental mode while the remaining photons propagate through the optical resonator mode and combine with the source photons entering the optical resonator. While the source photons propagating or entering the optical resonator resonate within the optical resonator, the entangled photons are not resonant with the optical resonator, and are selectively extracted before traversing a complete cycle in the optical resonator. Extracted entangled photons can then be output for use in, for example, a communication system.

Abstract: Improved architectures and related methods for enhancing entangled photon generation in optical systems are described. Photons from a light source are coupled from the fundamental mode into an optical resonator in a higher-order mode. The optical resonator comprises a photon generation portion configured to generate entangled photons from the coupled photons. The entangled photons are selectively extracted from the optical resonator in the fundamental mode while the remaining photons propagate through the optical resonator mode and combine with the source photons entering the optical resonator. While the source photons propagating or entering the optical resonator resonate within the optical resonator, the entangled photons are not resonant with the optical resonator, and are selectively extracted before traversing a complete cycle in the optical resonator. Extracted entangled photons can then be output for use in, for example, a communication system.

Abstract: A magnetometer comprises a diode structure including a diamond material having free electrons and free charge carriers. An electrical circuit is coupled to the diode structure and is operative to apply a forward bias voltage to the diode structure. An optical detector is operative to collect and measure an electroluminescence produced by the diode structure after the forward bias voltage is applied to the diode structure. A processor is coupled to the optical detector and is operative to determine a magnetic field based on the measured electroluminescence produced by the diode structure.

Abstract: A magnetometer comprises a diode structure including a diamond material having free electrons and free charge carriers. An electrical circuit is coupled to the diode structure and is operative to apply a forward bias voltage to the diode structure. An optical detector is operative to collect and measure an electroluminescence produced by the diode structure after the forward bias voltage is applied to the diode structure. A processor is coupled to the optical detector and is operative to determine a magnetic field based on the measured electroluminescence produced by the diode structure.