Caiming Sun

Caiming Sun
The Chinese University of Hong Kong, Shen Zhen · IRIM

Doctor of Philosophy

About

48
Publications
4,080
Reads
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253
Citations
Citations since 2017
41 Research Items
230 Citations
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
2017201820192020202120222023020406080100120
Introduction
Optoelectronics, Optical communication, Nanotechnology, Robotics

Publications

Publications (48)
Article
Large-scale one-dimensional (1D) waveguide surface grating arrays enable smaller antenna pitches and larger apertures for the OPAs. However, broad wavelength tuning is required for wide-angle beam steering along the transverse θ direction for 1D waveguide antennas. High-resolution and wide-angle beam steerings at visible and NIR wavelengths have no...
Conference Paper
We present the replacing of waveguide liquid claddings to implement 2D beam steering of an optical phased array. A maximum steering angle of >10° was achieved with RI from 1.0 to 1.63 at 940 nm.
Conference Paper
Two-dimensional beam steering on silicon nitride nanophotonic phased arrays from visible to near-infrared wavelengths is reported for the first time. Steering range of 66° in θ direction and 13.1° in ψ direction is achieved.
Conference Paper
We investigate the far-field pattern broadening of an apodized optical phased array when changing the waveguide cladding indices. Results indicate the beam broadening can be optimized and circumvented by tuning liquid claddings.
Conference Paper
Full-text available
Quadruped locomotion is currently a vibrant research area, which has reached a level of maturity and performance that enables some of the most advanced real-world applications with autonomous quadruped robots both in academia and industry. Blind robust quadruped locomotion has been pushed forward in control and technology aspects within recent deca...
Article
Full-text available
In this Letter, a two-dimensional (2D) beam steering on silicon nitride (SiNx) nanophotonic phased arrays from visible to near-infrared wavelengths is reported for the first time, to the best of our knowledge. In order to implement beam steering along the transverse direction for one-dimensional waveguide surface grating arrays, wavelengths from 65...
Preprint
Full-text available
Quadruped locomotion is currently a vibrant research area, which has reached a level of maturity and performance that enables some of the most advanced real-world applications with autonomous quadruped robots both in academia and industry. Blind robust quadruped locomotion has been pushed forward in control and technology aspects within recent deca...
Article
Full-text available
We report a simple concept to implement the single wavelength beam steering based on a liquid-cladded one dimensional optical phased array (OPA). The beam steering was realized by modifying the waveguide mode effective index through replacing the liquid upper claddings. A prototype of 32-channel liquid-cladded OPA was fabricated and characterized....
Preprint
Full-text available
A hopping leg, no matter in legged animals or humans, usually behaves like a spring during the periodic hopping. Hopping like a spring is efficient and without the requirement of complicated control algorithms. Position and force control are two main methods to realize such a spring-like behaviour. The position control usually consumes the torque r...
Preprint
Full-text available
Dynamic quadrupedal locomotion over rough terrains, although revealing remarkable progress over the last few decades, remains a challenging task. Small-scale quadruped robots are adequately flexible and adaptable to traverse numerous uneven terrains, such as slopes and stairs, while moving along its Sagittal direction. However, spinning behaviors o...
Conference Paper
Full-text available
With the gradual maturity of the software and hardware of quadruped robots, the application scenarios of quadruped robots are increasing, such as security, rescue, exploration and other tasks. Quadruped robots are flexible and adaptive to challenging or complex environment. This study presents a large-scale quadruped robot, Pegasus II, which is a n...
Conference Paper
Full-text available
We demonstrate large scale optical waveguide grating antennas with uniform emission operating from 1450nm to 1650nm. By tuning the laser wavelength, the beam steering angle of 30°was achieved.
Article
Full-text available
In this paper, an effective method of underwater coherent optical wireless communication (UCOWC) with a simplified detection scheme is proposed. The proof-of-concept experiments with M-ary PSK have been conducted with a common laser used for the signal source and local oscillator (LO). The BER performance has been evaluated at different underwater...
Conference Paper
We report a simple concept to realize an optical phased array for temperature sensing. A maximum sensitivity of 0.0132 o /K was obtained at = λ 1.45µ m. This work shows the promise of versatile OPA for optical sensing applications.
Article
Full-text available
Turbidity of water significantly affect the system performance of underwater wireless optical communication (UWOC). In this paper, we proposed and experimentally demonstrated a loss-tolerant UWOC system using a compact high-power 520-nm laser diode (LD) and a highly sensitive silicon photomultiplier (SiPM). The LD is directly modulated by the on-of...
Article
Full-text available
In this Letter, the broadband operation in wavelengths from 520 nm to 980 nm is demonstrated on silicon nitride nanophotonic phased arrays. The widest beam steering angle of 65° on a silicon nitride phased array is achieved. The optical radiation efficiency of the main grating lobe in a broad wavelength range is measured and analyzed theoretically....
Conference Paper
In this work, beam steering angle of 65° is achieved on a 32-channel antennas phased array. We demonstrate a wide range of beam steering in visible band with a supercontinuum laser for the first time.
Conference Paper
Full-text available
We experimentally measured the radiation of optical phased arrays fabricated on SOI waveguide platform. By tuning the input laser wavelength, we realized one-dimension beam steering and observed standing-wave patterns in the waveguide antennas.
Article
Full-text available
Underwater visible light communication (UVLC) is a promising technique to provide high-speed data transmission in the water. Since it is quite difficult to supply power to the underwater devices in the complex and severe marine environment, energy consumption would be a main consideration in the practical deployment of UVLC system. In this paper, w...
Article
Full-text available
Underwater wireless optical communication (UWOC) will play an important role in the underwater environment exploration and marine resource development due to its advantages of high data rate and good mobility. However, the significant signal power attenuation in the underwater channel limits the transmission distance of UWOC. Attenuation length (AL...
Article
Full-text available
In underwater optical wireless communication (UOWC) systems, using single photon avalanche photondiode (SPAD) as the detector can improve the transmission distance. However, the signal detection for SPAD-based systems is greatly challenged by the complex optical channel characteristics and SPAD nonlinear distortion. To address this issue, a novel d...
Article
Full-text available
In this paper, a promising phase-modulated underwater wireless optical communication (UWOC) system with silicon photomultiplier (SiPM) based receiver is proposed for the first time and its feasibility has been experimentally demonstrated in a laboratory environment. The phase modulation enables the additional degree of freedom available for encodin...
Article
Full-text available
An ion beam technique is used to lightly treat semi-insulating GaAs terahertz (THz) photoconductive antennas (PCAs), and a novel structure with two layers, a carrier acceleration layer and a carrier trapping layer, is demonstrated to afford high-efficiency, high-power THz emitters. The key roles of vacancy defects produced by the ion beam in effici...
Article
A metal–oxide–silicon (MOS) tunneling light-emitting diode is fabricated with ion-beam-synthesized β-FeSi2 precipitates embedded in the active region. Fe ions were implanted into p−-100 silicon substrate at cryogenic temperature (∼−120 °C), followed by rapid thermal oxidation (RTO). Under constant voltage biased in accumulation and at temperatures...
Article
Completely amorphous Fe–Si layers are formed by Fe implantation into Si substrate at a dosage of 5×1015 cm−2 using a metal vapor vacuum arc (MEVVA) ion source under 80 kV extraction voltage and cryogenic temperature. After thermal annealing, β-FeSi2 precipitates are formed in Si matrix. The influence of impurities in these amorphous Fe–Si layers on...
Article
Full-text available
High crystal-quality β-FeSi2 nanoparticles in silicon, prepared by ion beam synthesis and subjected to rapid thermal annealing (RTA), are investigated. Completely amorphous Fe–Si layers are formed by Fe implantation at cryogenic temperature, with a dosage of 5×1015cm−2, into float-zone silicon. After RTA at 900°C for 60s, β-FeSi2 precipitates are a...
Article
High crystal-quality β-FeSi2 nanoparticles in silicon, prepared by ion beam synthesis and subjected to rapid thermal annealing (RTA), are investigated. Completely amorphous Fe–Si layers are formed by Fe implantation at cryogenic temperature, with a dosage of 5×1015 cm−2, into float-zone silicon. After RTA at 900 °C for 60 s, β-FeSi2 precipitates ar...
Article
Full-text available
Changes in the surface morphology of ion-beam-synthesized amorphous Fe–Si layers after rapid thermal annealing (RTA) and furnace annealing (FA) were investigated using atomic force microscopy and transmission electron microscopy. Completely amorphous Fe–Si layers were formed by Fe implantation at a dosage of 5 × 1015 cm−2 using a metal vapour vacuu...
Article
The development of both modern microelectronics and lightwave technologies has enabled the establishment of the Internet which has introduced a profound change in our everyday lives. Because of Moore's law, computing today is limited less by the computation ability of microprocessors than by the rate at which the processor can communicate with the...
Article
beta-FeSi2 precipitates, with a band gap of ~0.8 eV, are formed by ion implantation into a silicon-on-insulator rib waveguide. A linear photocurrent of 1 muA was obtained from a p+-i-n+ structure under 3.16 mW incident power at 1550 nm.

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Projects

Projects (4)
Project
All-Solid-State LiDAR based on OPA
Project
dynamic quadruped robot working in complicated environment