A5058466742- Photonic and Optical Devices
- Advanced Fiber Laser Technologies
- Optical Network Technologies
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Advanced Fiber Optic Sensors
- Photonic Crystals and Applications
- Semiconductor Quantum Structures and Devices
- Semiconductor Lasers and Optical Devices
- Plasmonic and Surface Plasmon Research
- Radio Frequency Integrated Circuit Design
- Mechanical and Optical Resonators
- Advanced Photonic Communication Systems
- Advanced Antenna and Metasurface Technologies
- Advanced Semiconductor Detectors and Materials
- Terahertz technology and applications
- Antenna Design and Analysis
- Metamaterials and Metasurfaces Applications
- Microwave Engineering and Waveguides
- Neural Networks and Reservoir Computing
- Quantum optics and atomic interactions
- Spectroscopy and Laser Applications
- Laser-Plasma Interactions and Diagnostics
- Advancements in PLL and VCO Technologies
- Optical Coatings and Gratings
Xi'an Shiyou University
2015-2024
Guangzhou University
2024
Oil and Gas Center
2020-2024
Jinan University
2024
Xi'an Institute of Optics and Precision Mechanics
2011-2023
Bridge University
2022
China XD Group (China)
2022
University Research Co (United States)
2022
State Key Laboratory of Transient Optics and Photonics
2011-2022
China Geological Survey
2022
We propose a new strip/slot hybrid waveguide with double slots, which exhibits flat and low dispersion over 1098-nm bandwidth four zero-dispersion wavelengths. Dispersion of dual-slot silicon is mainly determined by mode transition from strip to slot rather than material dispersion. tailoring investigated tuning different structural parameters waveguides. Moreover, nonlinear coefficient phase-matching condition in FWM are both explored detail. The can be used generate supercontinuum...
In this study, a new refractive index sensor based on metal-insulator-metal waveguide coupled with notched ring resonator and stub is designed. The finite element method used to study the propagation characteristics of sensor. According calculation results, transmission spectrum exhibits typical Fano resonance shape. phenomenon caused by coupling between broadband narrowband spectrum. design, signal generated stub, while resonator. addition, structural parameters resonators structure filled...
Terahertz (THz) wave generation via four-wave mixing (FWM) in silicon membrane waveguides is theoretically investigated with mid-infrared laser pulses. Compared the conventional parametric amplification or wavelength conversion based on FWM waveguides, which needs a pump located anomalous group-velocity dispersion (GVD) regime to realize broad phase matching, normal GVD required collinear matching for THz-wave FWM. The and rib height of waveguide can be tuned obtain broadband matching....
In this paper, we proposed an all-optical version of photonic spiking neurons and spike-time-dependent plasticity (STDP) based on the nonlinear optical effects within a micro-ring resonator. system, self-pulsing effect was exploited to implement threshold control, equivalent pulse energy required for spiking, calculated by multiplying input power amplitude with its duration, about 14.1 pJ. The positive performance in excitability cascadability tests validated feasibility scheme. Furthermore,...
The influence of three-photon absorption (3PA) on cross-phase modulation (XPM) effect in the mid-infrared (IR) region is theoretically investigated silicon-on-sapphire (SOS) waveguides. It found that 3PA-induced nonlinear losses SOS waveguide will be considerable for pulse propagation wavelength 2300 nm-3300 nm when pump peak intensity high enough. For XPM process, 3PA and free-carrier effects can affect spectrum temporal profiles signal pulses sufficiently intensities. Moreover, XPM-induced...
In this paper, a compact slow-light microfiber coil resonator (MCR) is fabricated and the properties of it are analyzed tested. Based on coupled-wave theory, theoretical model for describing propagation in MCR established. Experimentally, element its relative time delay measured. The group velocity light pulse can be reduced to about 0.47c (c speed vacuum) shape passing through well preserved.
The impact of dispersion profiles silicon waveguides on femtosecond optical parametric amplification (OPA) is theoretically investigated. It found that flat quasi-phase-matching, smooth temporal and separable spectra for 200 fs pulses can be obtained by tailoring the cross-section rib waveguide. We achieve on-chip gain as high 26.8 dB idler conversion 25.6 a low pump peak power over bandwidth 400 nm in 10-mm-long engineered Our OPA find important potential applications highly integrated...
A femtosecond optical parametric oscillator (OPO) based on silicon-on-insulator (SOI) waveguide is proposed and analyzed numerically. By utilizing split-step Fourier method (SSFM), it demonstrated that ultra-wide tunable wavelength pulse can be realized under the phase matching condition. Due to interaction between nonlinearity flexible dispersion design, output signal tuned from 1645 1805 nm idler 1350 1456 nm. Moreover, peak power of exceeds 10 W 1700 1770 with pump 50 W. The OPO exhibits...
Femtosecond wavelength conversion in the telecommunication bands via four-wave mixing a 1.5 mm long silicon rib waveguide is theoretically investigated. Compared with picosecond pulses, spectra are greatly broadened for femtosecond pulses due to self-phase modulation and cross-phase process, it difficult achieve converter when pump signal pulse widths close or less than 100 fs because of spectral overlap. The influence broadening on efficiency also bandwidth 220 nm peak -8 dB demonstrated by...
Time-resolved circularly polarized pump–probe spectroscopy is used to study the carrier-density dependence of electron-spin polarization and spin relaxation dynamics in bulk intrinsic GaAs near bottom conduction band. The experimental result shows that initial degree less than 0.5, both time decrease with increasing carrier densities. simulation calculation band-gap renormalization effect has a significant influence on polarization, but it not physical origin polarization. Contrarily, can be...
In this study, we design a new refractive index sensor based on metal–insulator–metal waveguide coupled with notched ring and vertical rectangular resonators. We use the finite element method to study propagation characteristics of sensor. According calculation results, transmission spectrum exhibits typical Fano resonance shape. The phenomenon is caused by coupling between wide narrow spectrum. design, signal generated resonator, while resonator. addition, varied...
A highly efficient pulse cleaner based on nonlinear ellipse rotation (NER) in a liquid medium of CS(2) is investigated for the temporal contrast enhancement ultrashort pulses. In theory, transmissivity higher than 60% can be achieved with improved by about four orders magnitude, condition that extinction ratio polarizer-analyzer pair better 10(4). proof principle experiment, cleaned pulses at mJ level total as high 30% are obtained via NER, which enhanced three magnitude. This provides...
We had proved that a kind of graphene nanomaterial "carboxyl-functionalized oxide (GO-COOH)" possessed nonlinear saturable absorber (SA) property. The modulation depth GO-COOH water solution was measured as ∼8%. Moreover, GO-COOH-based SA device made and applied in an erbium-doped fiber laser. In this laser, Q-switching pulses mode-locked were both obtained. With increase the pump power, pulse width decreased from 9.05 to 2.49 μs. 844 fs, corresponding spectral bandwidth 3.64 nm....