Metallic materials to be coated on hollow dielectric THz waveguides were experimentally evaluated. Among six materials examined herein, Cu and Au exhibited highest transmittance for 2.5-mm-long parallel-plate waveguid...
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ISBN:
(纸本)9781728166209
Metallic materials to be coated on hollow dielectric THz waveguides were experimentally evaluated. Among six materials examined herein, Cu and Au exhibited highest transmittance for 2.5-mm-long parallel-plate waveguides, whose thicknesses necessary to compete bulk perfect electric conductor were also equivalent, 65 and 75 nm, respectively. The oxide layer natively formed on Cu surface did not impact the transmittance. Therefore, Cu had equal potential with Au, and would be the principal material considering its cost and availability.
Spectrometers with small footprint and high resolutions are highly demanded in various areas. We designed and experimentally demonstrated an ultra-compact fully integrated spectrometer based on metasurface-decorated p...
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ISBN:
(数字)9781943580767
ISBN:
(纸本)9781943580767
Spectrometers with small footprint and high resolutions are highly demanded in various areas. We designed and experimentally demonstrated an ultra-compact fully integrated spectrometer based on metasurface-decorated photonic integrated waveguides. (C) 2020 The Author(s)
We characterize pulse spectral broadening in dispersion-engineered 4H-SiC-on-insulator waveguides. We demonstrate, for the first time, supercontinuum generation in SiC waveguides. We achieve a 30-dB bandwidth over 300...
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ISBN:
(纸本)9781943580767
We characterize pulse spectral broadening in dispersion-engineered 4H-SiC-on-insulator waveguides. We demonstrate, for the first time, supercontinuum generation in SiC waveguides. We achieve a 30-dB bandwidth over 300 nm by using 510-fs pulses as the pump. (c) 2020 The Author(s)
We demonstrate an all -metallic terahertz topological waveguide using costeffective 3D printing technique. The experimental results indicate guiding of the mode within the topological hand gap in the bianisotropic med...
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ISBN:
(纸本)9780646825045
We demonstrate an all -metallic terahertz topological waveguide using costeffective 3D printing technique. The experimental results indicate guiding of the mode within the topological hand gap in the bianisotropic medium while no transmission in gapless state.
We present integrated uniform, phase-shifted and sampled Bragg gratings in lithium niobate-on-insulator. High extinction ratios of 35 dB at 1550 nm, quality factors of 3.4x10(4) and an electro-optic tuning efficiency ...
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ISBN:
(数字)9781943580767
ISBN:
(纸本)9781943580767
We present integrated uniform, phase-shifted and sampled Bragg gratings in lithium niobate-on-insulator. High extinction ratios of 35 dB at 1550 nm, quality factors of 3.4x10(4) and an electro-optic tuning efficiency of 14.6 pm/V are achieved. (C) 2020 The Author(s)
Graphene's exceptional features in electronics and optics are asserted to manifest in its "two-dimensional (2-D) Dirac" nature. However, good integration of graphene with current optical materials seems ...
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ISBN:
(纸本)9781728182087
Graphene's exceptional features in electronics and optics are asserted to manifest in its "two-dimensional (2-D) Dirac" nature. However, good integration of graphene with current optical materials seems elusive due to its thin film structure, and its delicate 2-D optical properties may be destroyed in the integration process. Here, three-dimensional (3-D) Dirac materials like cadmium arsenide may be a good contender as a graphene plasmonics substitute. We compare and contrast the optical properties of 3-D Dirac materials with graphene in this paper. 3-D Dirac materials has the potential to become the cornerstone for Internet-of-Things device applications.
Honeywell is using Brillouin lasing in chip-scale SiO2/Si3N4 waveguide resonators to create a robust ring laser gyroscope. Limitations on gyro performance are cascading of Brillouin lasing to higher SBS orders and sca...
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ISBN:
(纸本)9781728158891
Honeywell is using Brillouin lasing in chip-scale SiO2/Si3N4 waveguide resonators to create a robust ring laser gyroscope. Limitations on gyro performance are cascading of Brillouin lasing to higher SBS orders and scattering loss of the BriBonin light in the resonator. We describe advances addressing each of these issues.
We present an amorphous silicon material having a record-high continuous-wave L-band conversion efficiency of -14.7 dB. The material is stable over 12 hours of 23 dBm continuous-wave C-band pumping. (C) 2020 The Autho...
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ISBN:
(纸本)9781943580767
We present an amorphous silicon material having a record-high continuous-wave L-band conversion efficiency of -14.7 dB. The material is stable over 12 hours of 23 dBm continuous-wave C-band pumping. (C) 2020 The Author(s)
There is an increasing demand for highly integrated optical and optoelectronical devices that provide active laser emission, adaptability and low optical losses. A well-established production technology for customized...
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ISBN:
(数字)9781510634718
ISBN:
(纸本)9781510634718
There is an increasing demand for highly integrated optical and optoelectronical devices that provide active laser emission, adaptability and low optical losses. A well-established production technology for customized structures with high functionality and geometrical flexibility is additive manufacturing (AM). It enables new constructional degrees of freedom to overcome the limitations of substractive material processing such as milling and drilling. Commercial AM systems for metals and polymers are ubiquitous;whereas glass AM systems almost exclusively exist in scientific environments. Laser glass deposition welding allows the AM of waveguides by fusing coreless fused silica fibers with a diameter of 400 mu m and a 50 mu m thick polymer coating onto a fused silica substrate. The deposition process is performed with defocused CO2-laser radiation (10.6 mu m). Based on laser deposition welding, the fiber is fed laterally into the processing zone and is melted or fused by the incoming laser beam. In order to achieve a sufficient coupling of laser radiation into and out of the fibers, a proper cleaving process for the end faces has been established. The cleaving is performed with a CO2-laser based process for optimized and reproducible results. In this contribution, the focus is on the manufacturing of bended waveguides and the feasible bending radii, which can be accomplished during the deposition process. The influence of the bending radius on the guiding efficiency is investigated. Therefore, the light transmission and beam profile of the deposited fibers is measured and compared with an untreated one. Furthermore, the appearance of the cleaved end faces and the internal stress in the glass substrate are characterized. Functional, nearly stress-free curved and straight waveguides for light transmission with high position stability are achieved, which opens a wide range of applications for optical system integration.
We achieved highly unidirectional topological edge states in a terahertz slab waveguide based on the triangular honeycomb lattice. The unidirectional property and robustness of edge states against various kinds of def...
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ISBN:
(数字)9781943580767
ISBN:
(纸本)9781943580767
We achieved highly unidirectional topological edge states in a terahertz slab waveguide based on the triangular honeycomb lattice. The unidirectional property and robustness of edge states against various kinds of defects were presented and studied. (C) 2020 The Author(s)
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