- 标题
- 摘要
- 关键词
- 实验方案
- 产品
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[IEEE 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Munich, Germany (2019.6.23-2019.6.27)] 2019 Conference on Lasers and Electro-Optics Europe & European Quantum Electronics Conference (CLEO/Europe-EQEC) - Bi-Junction Carrier Depletion Type Electro-Optic Phase-Shifters
摘要： Silicon photonic integrated circuits (PICs) combine dense optical system integration with industrial scalability by adopting well-established CMOS fabrication processes. An electro-optic phaseshifter (EOP) represents a basic building unit of several PICs applications, including datacom optical switches, PIC-FPGAs, and beam steering. In-situ resistive-heaters in close vicinity of waveguides, or free-carrier injection/depletion in doped junctions, are common methods to build EOPs. Literature reports thermal shifters consuming 24.7 mW to achieve DC large signal π-phaseshift, power consumption of injection PIN implementations and depletion PN modulators of 10 mW and ≈ 0 mW respectively. A thermal EOP naturally avoids carrier-induced optical insertion losses (IL), in contrast to a PIN/PN modulator. Thus, thermal and PIN/PN methods trade-off IL with electrical power rather than minimizing both. An EOP of low optical losses and low electrical power is highly desired in large-signal, and low-speed applications.
关键词： electro-optic phaseshifter,datacom optical switches,PIC-FPGAs,beam steering,CMOS fabrication,Silicon photonic integrated circuits
更新于2025-09-11 14:15:04
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Steering Second Harmonic Beam in Nanophotonic Waveguides by Gratings
摘要： Efficient manipulation of the wavefront at the nanoscale is important for optical beaming, signal encoding, and nonlinear phase matching, etc. Diffraction gratings are widely adapted for the control of the wavefront of lightwaves, but predominantly in linear optics. Here, we demonstrated the flexible steering of the second harmonic (SH) beams in nanophotonic waveguides using gratings. The emission angle of the SH signals can be shifted by an amount of 60° from the waveguide axis into the collection cone, allowing the detection of the otherwise undetectable SH from co-propagating waveguide modes in the high-loss waveguides. The SH conversion efficiency (3 × 10?5 W?1) from co-propagating modes contributes up to 26.7% of the total SH signal. As the pump wavelength varies from 770 to 840 nm, the SH beam is swept by up to 22°. This design functions as a nonlinear grating coupler for nanophotonic systems and could be used for efficient nonlinear coherent light generation and integrated nonlinear nanophotonics.
关键词： Fourier imaging,nanophotonics,second harmonic generation,nonlinear grating coupler,beam steering
更新于2025-09-11 14:15:04
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[IEEE 2019 21st International Conference on Transparent Optical Networks (ICTON) - Angers, France (2019.7.9-2019.7.13)] 2019 21st International Conference on Transparent Optical Networks (ICTON) - Development of Non-Mechanical Beam Steering and LiDAR Based on Photonic Crystal and Si Photonics
摘要： LiDAR is crucial for future robots/drones, autonomous vehicles, etc. Photonic crystal and Si photonics technologies have potential of non-mechanical beam steering and coherent FMCW LiDAR. We report the current status of their development.
关键词： slow light,FMCW,LiDAR,photonic crystal,beam steering
更新于2025-09-11 14:15:04
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A Low-Profile and High-Gain Frequency Beam Steering sub-THz Antenna Enabled by Silicon Micromachining
摘要： A very low-profile sub-THz high-gain frequency beam steering antenna, enabled by silicon micromachining, is reported for the first time in this paper. The operation bandwidth of the antenna spans from 220 GHz to 300 GHz providing a simulated field of view of 56?. The design is based on a dielectric filled parallel-plate waveguide (PPW) leaky-wave antenna fed by a pillbox. The pillbox, a two-level PPW structure, has an integrated parabolic reflector to generate a planar wave front. The device is enabled by two extreme aspect ratio, 16 mm x 16 mm large perforated membranes, which are only 30 μm thick, that provide the coupling between the two PPWs and form the LWA. The micromachined low-loss PPW structure results in a measured average radiation efficiency of ?1 dB and a maximum gain of 28.5 dBi with an input reflection coefficient below ?10 dB. The overall frequency beam steering frontend is extremely compact (24 mm x 24 mm x 0.9 mm) and can be directly mounted on a standard WM-864 waveguide flange. The design and fabrication challenges of such high performance antenna in the sub-THz frequency range are described and the measurement results of two fabricated prototypes are reported and discussed.
关键词： beam steering,leaky-wave antennas,silicon on insulator,terahertz radiation,silicon micromachining,quasi-optics,submillimeter-wave antennas
更新于2025-09-11 14:15:04
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[IEEE 2018 International Topical Meeting on Microwave Photonics (MWP) - Toulouse (2018.10.22-2018.10.25)] 2018 International Topical Meeting on Microwave Photonics (MWP) - All Photonic Radar System based on Laser Frequency Sweeping and Leaky-Wave Antennas
摘要： In this paper, we report on a novel all photonic FMCW radar system for detection and localization of multiple objects. This functionality is achieved by utilizing the self-sweeping of tunable external cavity lasers (ECLs) in combination with optical heterodyning for generating a millimeter-wave FMCW radar signal. In order to also localize the objects, frequency scanning mm-wave leaky-wave antennas (LWAs) are used. The LWAs enable beam steering via the FMCW signal for estimating the direction of arrival (DoA) of the radar echos. Overall, this approach yields very compact all photonic radar systems that do not require electrical oscillators or optical modulators. In addition, thanks to the LWAs, multiple objects can be localized within a single sweep and without any clock or control signals. Experimentally, the performance of a developed all photonic 60 GHz radar with a 10 GHz bandwidth is demonstrated for multiple object detection and localization. It is shown that the developed radar provides a range and DoA angle estimation error of <1 cm and ~3°, respectively. This is achieved without using any dedicated radar signal post-processing algorithms.
关键词： Tunable Lasers,FMCW radar,Beam Steering,Microwave photonics,Leaky-Wave Antennas
更新于2025-09-11 14:15:04
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[IEEE 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA) - Cartagena des Indias, Colombia (2018.9.10-2018.9.14)] 2018 International Conference on Electromagnetics in Advanced Applications (ICEAA) - A Low-Profile, Planar, Power-Efficient 2D Beam-Steering Antenna Technology
摘要： The paper explains a recently demonstrated 2D beam-steering antenna technology and its potential to develop a low-cost communication-on-the-move (COTM) terminal antenna. A low-cost COTM antenna is critical for receiving TV and internet via existing geostationary and upcoming low-earth-orbit (LEO) satellite constellations. The new beam-steering technology is based on near-field phase transformation and its working is verified by a prototype design reported recently. Performance indicators of the prototype are compared here with some commercially available COTM terminal antennas. A fully passive design, low-profile, low power requirements, and simple design configuration give the new steering antenna a competitive advantage over existing COTM terminal antennas from KYMETA and ThinKom.
关键词： low-earth-orbit (LEO) satellite,communication-on-the-move (COTM),low-profile,beam-steering antenna,near-field phase transformation
更新于2025-09-10 09:29:36
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[IEEE 2018 China International SAR Symposium (CISS) - Shanghai, China (2018.10.10-2018.10.12)] 2018 China International SAR Symposium (CISS) - A Novel Beam-Steering Method for Spaceborne Interferometric Synthetic Aperture Radar Altimeter
摘要： The Spaceborne altimeter based on Interferometric Synthetic Aperture Radar (InSAR) can achieve high-resolution, wide-swath and high-accuracy height measurement of sea surface. The beam steering of the SAR systems in orbit is designed to access SAR images with the same noise equivalent sigma zero (NESZ) for near-range and far-range observation areas. However, for InSAR altimeters, the conventional method would result in the height accuracy of near-range areas much higher than the far-range ones. To achieve the required height accuracy in far-range areas, the SAR systems have to improve the transmission power or increase the size of antenna, improving the complexity in system designation. In this paper, a novel beam-steering method for spaceborne InSAR altimeters is proposed. The beam-steering angle is optimized according to the height accuracy in the whole scene. The performance of the proposed method over the conventional method is validated by the simulation.
关键词： Beam steering,Radar altimeter,Interferometric Synthetic Aperture Radar (InSAR)
更新于2025-09-09 09:28:46
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[IEEE 2018 15th European Radar Conference (EuRAD) - Madrid, Spain (2018.9.26-2018.9.28)] 2018 15th European Radar Conference (EuRAD) - Initial Design of Phase-Frequency Scanned Array Using CRLH Leaky-Wave Antennas
摘要： Initial design of phase-frequency scanned array using composite right/left-handed (CRLH) waveguide leaky-wave antennas (LWAs) is studied in this paper. The array consists of 32 frequency scanning CRLH LWAs that are fed by a phased feed system. Two-dimensional (2D) beam steering capability is achieved in the plane normal to the array aperture and verified by the full-wave simulations. This array is capable of scanning to 61° from backward to forward directions in the frequency-scan plane and 17° in the phase-scan plane. The beamwidth is approximately 2° with ?20 dB sidelobe level (SLL) in the frequency-scan plane and 2.5° with maximum ?10 dB SLL in the phase-scan plane. Compared with traditional 2D scanning array, the feed system of this phase-frequency scanned array can be simplified significantly.
关键词： phase-frequency scanned array,leaky-wave antenna (LWA),two-dimensional (2D) beam steering,composite right/left-handed (CRLH),phased array
更新于2025-09-09 09:28:46
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[IEEE 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Chengdu, China (2018.5.7-2018.5.11)] 2018 International Conference on Microwave and Millimeter Wave Technology (ICMMT) - Polarization-Dependent Full-Space Beam Steering with Orbital-Angular-Momentum Mode by Anisotropic Coding Metasurface
摘要： Coding metasurfaces have attracted much attention in recent years. Here, we propose a novel polarization-dependent full-space beam-steering anisotropic coding metasurface to radiate beams with orbital-angular-momentum (OAM) modes. When the polarizations of incident electromagnetic waves are orthogonal, the beams can be emitted to the upper and lower half spaces with different coding information, respectively. A scheme is presented to radiate multiple OAM modes with different deflecting angles to the corresponding spaces. This work has great potentials in multi-target communications and tracking radar systems.
关键词： coding metasurfaces,orbital-angular-momentum (OAM),multi-target communications,polarization-dependent,beam-steering,tracking radar systems
更新于2025-09-04 15:30:14
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[IEEE 2018 15th European Radar Conference (EuRAD) - Madrid, Spain (2018.9.26-2018.9.28)] 2018 15th European Radar Conference (EuRAD) - Design and demonstration of Linearly-Polarized Transmit-Arrays in X-band
摘要： This paper describes the design and demonstration of planar transmit-arrays operating in X-band with 1-bit phase quantization and based on wideband high efficiency unit cells. The unit cell consists of two identical square patch antennas loaded by C-loop slots and interconnected in their centers by a metalized via hole. The proposed transmit-array achieves a maximum directivity of 25.1 dBi and a gain of 22.8 dBi. Radiation efficiency of 56.3% is also obtained with a 1-dB gain bandwidth of up to 9.2% around 9.85 GHz and very low cross-polarization levels. The beam-steering up to 30° is achieved by tilting the focal source.
关键词： Patch antenna,slot loaded patch,Transmit-array,Antenna arrays,X-band,Unit cell,beam-steering
更新于2025-09-04 15:30:14