We investigate the coupling performance between conventional silicon strip (A(eff) similar to 0.06 mu m(2)) and novel ultra-low mode area V-groove waveguides (A(eff) similar to 0.005 mu m(2)) in a directional coupler ...
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ISBN:
(纸本)9781728106151
We investigate the coupling performance between conventional silicon strip (A(eff) similar to 0.06 mu m(2)) and novel ultra-low mode area V-groove waveguides (A(eff) similar to 0.005 mu m(2)) in a directional coupler configuration. We find high peak coupling efficiencies and examine fabrication tolerances and operating bandwidth.
Hybrid quantum devices, incorporating both atoms and photons, can exploit the benefits of both to enable scalable architectures for quantum computing and quantum communication, as well as chip-scale sensors and single...
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Hybrid quantum devices, incorporating both atoms and photons, can exploit the benefits of both to enable scalable architectures for quantum computing and quantum communication, as well as chip-scale sensors and single-photon sources. Production of such devices depends on the development of an interface between their atomic and photonic components. This should be compact, robust, and compatible with existing technologies from both fields. Here we demonstrate such an interface. Cold cesium atoms are trapped inside a transverse, 30μm-diameter through hole in an optical fiber, created via laser micromachining. When the guided light is on resonance with the cesium D2 line, up to 87% of it is absorbed by the atoms. The corresponding optical depth per unit length is ∼700 cm−1, higher than any reported for a comparable system. This is important for miniaturization and scalability. The technique can be equally effective in optical waveguide chips and other existing photonic systems, providing a promising platform for fundamental research.
In this work, we investigate the guided mode properties of planar anisotropic aluminum-doped zinc oxide waveguides (air/metamaterial/silicon oxide) at the epsilon-near-zero spectral point. Our calculations predict two...
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ISBN:
(数字)9781510628540
ISBN:
(纸本)9781510628540
In this work, we investigate the guided mode properties of planar anisotropic aluminum-doped zinc oxide waveguides (air/metamaterial/silicon oxide) at the epsilon-near-zero spectral point. Our calculations predict two fundamentally different propagation regimes for the lowest order guided TM and TE modes over a broad spectral range (400-2000 nm). Our study shows that excitation of the TM guided mode is possible for wavelengths higher than epsilon-near-zero spectral point. However the propagation distance for such a TM mode will strongly depend on the spectral position of the mode's eigenfrequency. E.g., propagation distance is maximized for eigenfrequencies near epsilon-near-zero point and reduced by an order of magnitude as the eigenfrequency is tuned by similar to 50 nm.
Optical waveguides and integrated optical devices are promising solutions for many applications, such as medical diagnosis, health monitoring and light therapies. Despite the many existing reviews focusing on the mate...
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Optical waveguides and integrated optical devices are promising solutions for many applications, such as medical diagnosis, health monitoring and light therapies. Despite the many existing reviews focusing on the materials that these devices are made from, a systematic review that relates these devices to the various materials, fabrication processes, sensing methods and medical applications is still seldom seen. This work is intended to link these multidisciplinary fields, and to provide a comprehensive review of the recent advances of these devices. Firstly, the optical and mechanical properties of optical waveguides based on glass, polymers and heterogeneous materials and fabricated via various processes are thoroughly discussed, together with their applications for medical purposes. Then, the fabrication processes and medical implementations of integrated passive and active optical devices with sensing modules are introduced, which can be used in many medical fields such as drug delivery and cardiovascular healthcare. Thirdly, wearable optical sensing devices based on light sensing methods such as colorimetry, fluorescence and luminescence are discussed. Additionally, the wearable optical devices for light therapies are introduced. The review concludes with a comprehensive summary of these optical devices, in terms of their forms, materials, light sources and applications.
In this project it was found that Fourier ptychographic microscopy can be improved far beyond its conventional limits via waveguide-based optical systems. Extensive in silico studies showed that images obtained on hig...
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ISBN:
(数字)9781510628465
ISBN:
(纸本)9781510628465
In this project it was found that Fourier ptychographic microscopy can be improved far beyond its conventional limits via waveguide-based optical systems. Extensive in silico studies showed that images obtained on high-refractive index material waveguide chips in conjunction with hyperspectral illumination light and finely designed waveguide geometries can be combined via a modified phase-retrieval algorithm to yield a resolution below 150 nm.
We proposed the design of coupling terahertz wave into a plasmonic waveguide via using two alumina ribbon waveguides. The dispersion relation of fundamental alumina waveguide mode shows that it has intersections with ...
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We proposed the design of coupling terahertz wave into a plasmonic waveguide via using two alumina ribbon waveguides. The dispersion relation of fundamental alumina waveguide mode shows that it has intersections with plasmonic modes, resulting in the power transferred efficiently from dielectric waveguide to the structures. In experiment, a dual band metallic waveguide with two different groove depths associated with input and output alumina strips coated by polypropylene is fabricated and measured. Two plasmonic mode bands sup ported by plasmonic waveguide can be found because the terahertz radiation has been coupled from free space to dielectric ribbon waveguide at resonance frequencies of 0.28 THz and 0.47 THz. This coupling approach opens a novel avenue for coupling terahertz radiation and can be used for developing novel terahertz planar wave de vices and circuits.
Germanium-on-silicon, mid-infrared waveguides are used to demonstrate molecular fingerprint sensing of poly(methyl methacrylate) between 7.5 and 10 mu m wavelength. The results are compared to Fourier transform infrar...
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ISBN:
(纸本)9781728109053
Germanium-on-silicon, mid-infrared waveguides are used to demonstrate molecular fingerprint sensing of poly(methyl methacrylate) between 7.5 and 10 mu m wavelength. The results are compared to Fourier transform infrared spectroscopy measurements, highlighting the potential of the platform for the identification of analytes.
Silicon-on-insulator waveguides covered with graphene in length of 60 mu m have been fabricated and investigated. Self phase modulation were carried out, and enhanced nonlinear phase shift, Kerr nonlinearity and figur...
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ISBN:
(纸本)9781728109053
Silicon-on-insulator waveguides covered with graphene in length of 60 mu m have been fabricated and investigated. Self phase modulation were carried out, and enhanced nonlinear phase shift, Kerr nonlinearity and figure-of-merit have been confirmed in graphene-silicon waveguides by experiments and simulations.
We explore fabrication-process dependencies on optical losses of AlN films and demonstrate Second Harmonic Generation through modal phase-matching in integrated AlN waveguides. A loss-dependent conversion efficiency m...
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ISBN:
(纸本)9781943580576
We explore fabrication-process dependencies on optical losses of AlN films and demonstrate Second Harmonic Generation through modal phase-matching in integrated AlN waveguides. A loss-dependent conversion efficiency model is developed to better design waveguides in lossy AlN media. (C) 2019 The Author(s)
A graphene-coated nanowire (GCNW) based plasmon waveguide is proposed to achieve outstanding guiding performance in the mid-infrared band. The modal properties of the fundamental graphene plasmon mode and modal depend...
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A graphene-coated nanowire (GCNW) based plasmon waveguide is proposed to achieve outstanding guiding performance in the mid-infrared band. The modal properties of the fundamental graphene plasmon mode and modal dependence on the elliptical nanowire size, thickness and width of the low-index dielectric layer, chemical potential of graphene and the operating frequency are revealed in detail by using finite element method. Results show that the low-index layer has a significant influence on modal properties, and a propagation length over 13 mu m along with an extremely small normalized mode size (similar to 10(-6)) could be obtained simultaneously, which is more than two orders of magnitude smaller compared with free-standing GCNW and GCNW dimers. Besides, study on crosstalk characteristics between the adjacent structures indicates the proposed waveguide exhibits very low crosstalk. Due to these excellent transmission characteristics, the proposed configuration could be used to fabricate various functional photonic devices for the future nanoscale photonic integrated circuits.
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