The design of a wide scan angle matched hexagonal ridged waveguide (HRWG) antenna array element is presented for Ka-band satellite downlink in low Earth orbit non-terrestrial network applications. The antenna achieves...
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ISBN:
(纸本)9798350385892;9782874870774
The design of a wide scan angle matched hexagonal ridged waveguide (HRWG) antenna array element is presented for Ka-band satellite downlink in low Earth orbit non-terrestrial network applications. The antenna achieves a very low active reflection coefficient (ARC) of less than -18 dB across a large bandwidth from 17.3 to 20.2 GHz with a +/- 50 degrees scan range. The aperture of the HRWG was designed to limit the variations in ARC when scanning, minimizing load pulling of integrated active devices as demonstrated with a modeled power amplifier in a co-simulation.
Spin defects in diamond are attracting interest because of their possible application in quantum information processing. One group of such defects are group 4 defects (G4V). They posses an inversion symmetry, which ma...
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ISBN:
(纸本)9781510670839;9781510670822
Spin defects in diamond are attracting interest because of their possible application in quantum information processing. One group of such defects are group 4 defects (G4V). They posses an inversion symmetry, which makes them (in first order) invariant under electric fields, allowing them to be placed inside nanophotonic structures. One of those defects is the tin-vacancy (SnV) center. It has an atom like energy structure with the zero phonon line (ZPL) at 620 nm and a Debye-Waller factor of 0.6. The lower two branches are separated by 850 GHz [1], which means that phonon induced dephasing can be neglected at 2 K.
Commercially available, low-cost radar transceivers tend to integrate all radio frequency (RF) components including the antennas, thus omitting an accessible RF interface. This limits their use for applications with s...
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ISBN:
(纸本)9798350375053;9798350375046
Commercially available, low-cost radar transceivers tend to integrate all radio frequency (RF) components including the antennas, thus omitting an accessible RF interface. This limits their use for applications with special requirements, such as application-specific antenna designs. To overcome this drawback, a novel integration concept is presented that adapts integrated transceivers employing antennas-in-package (AiP) in radar systems with customized passive RF front-ends. The approach is demonstrated with a continuous-wave (CW) 61-GHz radar system tailored to the needs of medical research studies aiming to explore the morphology of the human pulse wave. The approach features 3D-printed freeform rectangular waveguides (RWG), an AiP-to-RWG transition, a 3D-printed horn fed lens antenna, and a directional coupler to implement a monostatic radar based on a commercial bistatic AiP-transceiver. Simulation and measurements validate the fulfillment of the application-specific requirements.
We present general conditions for lossless propagation in near-infrared hyperbolic metamaterial (HMM) waveguides with lateral confinement. We conclude that HMMs based on noble metals, rather than transparent conductin...
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ISBN:
(纸本)9781557529688
We present general conditions for lossless propagation in near-infrared hyperbolic metamaterial (HMM) waveguides with lateral confinement. We conclude that HMMs based on noble metals, rather than transparent conducting oxides, offer greatest promise for low-loss propagation.
In this paper, we evaluate the viability of Cubesats as an attractive platform for lightweight instrumentation by describing a proof of concept CubeSat that houses an astrophotonic chip for transit spectroscopy-based ...
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ISBN:
(纸本)9781510675087;9781510675070
In this paper, we evaluate the viability of Cubesats as an attractive platform for lightweight instrumentation by describing a proof of concept CubeSat that houses an astrophotonic chip for transit spectroscopy-based exoplanet atmosphere gas sensing. The Twin Earth SEnsoR Astrophotonic CubesaT (TESERACT) was designed to house a correlation spectroscopy chip along with an electrical and optical system for operation. We investigate design challenges and considerations in incorporating astrophotonic instrumentation such as component integration, thermal management and optical alignment. This work aims to be a pathfinder for demonstrating that astrophotonic-based CubeSat missions can perform leading edge, targeted science in lower-cost CubeSat platforms.
In this paper, the building blocks for a smart glass connector platform are presented. The connector is meant to connect optical fibers, which cannot be connected using conventional connector or splicing technology, e...
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ISBN:
(纸本)9781510669307;9781510669291
In this paper, the building blocks for a smart glass connector platform are presented. The connector is meant to connect optical fibers, which cannot be connected using conventional connector or splicing technology, e.g. optical sensing fibers embedded in composite structures for structural health monitoring purposes. We are setting up a technology platform using aluminosilicate glass substrates as interposer between 2 optical fibers that need to be connected. Using femtosecond laser technology, this interposer can be equipped with basic building blocks such as low-loss intermediate single mode waveguides, couplers and Bragg grating sensors. To this end, femtosecond laser-written waveguides are inscribed in aluminosilicate glass (Xensation (R) Cover float glass) and the laser parameters are optimized. waveguides with estimated propagation losses of 0.65 dB/cm are obtained and are subsequently used to make couplers in glass. These couplers can be tuned in coupling ratio between 87:13 and 15:85 by varying the coupling length from 1 to 4.5 mm at a pitch of 17 mu m. In addition, fs-laser written Bragg gratings were manufactured, with the goal to add monitoring capabilities to the interposer. These were realized by modulating the fs-laser pulse train and as such a reflectivity up to 5.9% was achieved in the C-band for 23 mm long Bragg gratings. When properly designed, these can be made compatible with standard read out equipment for fiber Bragg gratings (FBGs).
We demonstrate an in situ, non-invasive measurement method to ensure stable manufacturing and quality control of integrated waveguides. This method assumes that the scattered light from a waveguide is proportional to ...
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ISBN:
(纸本)9781510678781;9781510678798
We demonstrate an in situ, non-invasive measurement method to ensure stable manufacturing and quality control of integrated waveguides. This method assumes that the scattered light from a waveguide is proportional to the propagating light inside the waveguide. Consequently, we can estimate the waveguide losses by measuring the scattered light along the waveguide. We compare this newly demonstrated measurement method with state-of-the-art methods, including Fabry-Perot interferometry, Mach-Zehnder Interferometry, ring resonator interferometry, and the cut-back method. To validate our measurement method's working principle, we fabricated multiple amorphous silicon waveguides and characterized them using both, the presented and the cut-back method. Both methods yielded comparable results, indicating losses of around 1 dB/cm. For further investigation, multiple measurements of the same sample were conducted, resulting in a standard deviation of 0.29 dB/cm to 0.60 dB/cm. These initial standard deviations are sufficient to verify the presented measurement method. However, we want to emphasize that the main source of these deviations is due to the used measurement setup, indicating that the method has potential for improvement. Nevertheless, we have demonstrated that an in situ, non-invasive measurement of integrated waveguide losses is possible.
A loaded waveguide antenna has been designed, manufactured, and tested to explore potential applications in ocean observation projects. This antenna can operate under high pressure and attenuation in the deep sea with...
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ISBN:
(纸本)9798350369908;9798350369915
A loaded waveguide antenna has been designed, manufactured, and tested to explore potential applications in ocean observation projects. This antenna can operate under high pressure and attenuation in the deep sea with simple techniques to adjust the operating frequency.
Integrable optical isolators, play a crucial role in fortifying the overall performance of Photonic Integrated Circuits (PICs). In this paper, we propose a device functioning in Transverse Magneto-OpticKerr Effect (TM...
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Integrable optical isolators, play a crucial role in fortifying the overall performance of Photonic Integrated Circuits (PICs). In this paper, we propose a device functioning in Transverse Magneto-OpticKerr Effect (TMOKE) configuration, where a magneto-optic material is sandwiched in between parallel dielectric slab waveguides. The coupled optical modes hosted by such a geometry undergo an electromagnetic profile transformation that can be exploited to confine the input mode in one waveguide during forward propagation and in the other during backward propagation. Together with a ring resonator, such a system can provide a 20dB isolation ratio with negligible insertion losses.
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