1,721,256 research outputs found
Glass integrated photonics for quantum technology
No full textThe emerging field of quantum technologies requires a range of photonic devices, many with demanding specifications. The area of quantum information processing requires scaling in order to increase the complexity of experiments, this has led researchers towards integrated photonic platforms. The key property of these single photon devices is low-loss operation and as a consequence glass and silica devices have been a dominant platform. Whereas atom chip sensors require stable compact systems for converting optical fibre modes to free space beams for atom trapping.In this talk I will present the photonic engineering undertaken at the University of Southampton to fabricate devices for the quantum technology community. The key fabrication approach is a direct UV writing technique, where a UV laser beam is used to define waveguides, splitters/couplers, Bragg gratings and 2D tilted gratings. The fabricated devices include cascaded arrays of Mach-Zehnder interferometers to preform photon-photon interactions, single photon sources via spontaneous four-wave mixing, integrated superconducting single photon detectors and 2D diffraction gratings. In addition to the inscription method I will describe the fabrication of the substrates required for the UV writing process which are generated via Flame Hydrolysis Deposition.I will discuss our most recent work on single photon linear optical networks constructed from a number of identical reconfigurable modules. The modules are characterised separately to produce an accurate model of the network and the cellular approach permits the replacement of modules that are deficient. Each module comprises of an array of 10 Mach-Zehnder interferometers with 40 thermo-optic phase shifters on each chip that control both the amplitude and phase of the optical modes. By concatenating modules any arbitrary N ×N unitary network can be realised.The channel waveguides are engineered to be mode matched to standard optical fibre producing excellent coupling efficiency. I will present our recent work in this area and other photonic devices for the field of quantum technology
Alien Registration- Gates, James T. (Mexico, Oxford County)
Full text linkhttps://digitalmaine.com/alien_docs/17911/thumbnail.jp
Optically integrated fiber: a new platform for harsh environmental sensing
No full textThis work reports a new optical platform that directly integrates optical fiber upon a planar substrate. The fabrication methodology uses flame hydrolysis deposition to form an optically dynamic as well as mechanically strong composite. The resulting platform is conducive to planar fabrication techniques enabling MEMS microstucturing; mechanically continuous on-chip-off-chip interconnects, removing the dependency upon traditionally vulnerable coupling methods; and is compatible with Bragg grating inscription, permitting multiplexed multiparameter sensing. Chemical sensing is demonstrated through on-chip evanescent field exposure and physical sensing is demonstrated through use of integrated microstructures
Planar micromachined glass cantilevers utilising integrated Bragg Fabry-Perot cavities
No full textHere we demonstrate a glass cantilever based on a unique micromachining and etching approach, combined with UV written Bragg gratings. We shall also discuss the increase in sensitivity by using two Bragg gratings to form Fabry-Pérot cavity. Cantilevers are in ultra sensitive force sensors used in applications such as Atomic Force Microscopy, mass sensing and acoustic transducers
Integrated quantum photonics
No full textThis chapter will only be concerned with quantum photonics; systems where the photons themselves act as carriers of quantum informatio
Optical beam splitting and switching based on arrays of tilted Bragg gratings in planar waveguides
No full textIntegrated optic glass microcantilever with Bragg gratings forming a Fabry-Pérot interferometer for force sensing
No full textMicrocantilevers are the workhorse for ultra sensitive force sensors and are used in applications such as atomic force microscopy, sensing forces as small as 10pN [1]. In previous work [2] we have demonstrated the first integrated optical glass microcantilever, and we now show for the first time Bragg gratings forming a Fabry-Pérot interferometer acting to increase the force-sensitivity of the device. The fabrication of the glass microcantilever is based on a novel physical micromachining and etching approach, combined with UV written Bragg gratings. The advantages of the in-situ Fabry-Pérot interferometer will also be discussed
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