A5102817837- Advanced Fiber Laser Technologies
- Photonic and Optical Devices
- Advanced Fiber Optic Sensors
- Photonic Crystal and Fiber Optics
- Laser-Matter Interactions and Applications
- Semiconductor Lasers and Optical Devices
- Photonic Crystals and Applications
- Mechanical and Optical Resonators
- Solid State Laser Technologies
- Advanced Photonic Communication Systems
- Optical Network Technologies
- Photoacoustic and Ultrasonic Imaging
- 2D Materials and Applications
- Optical Coatings and Gratings
- Chalcogenide Semiconductor Thin Films
- Thermography and Photoacoustic Techniques
- Gold and Silver Nanoparticles Synthesis and Applications
- Quantum Dots Synthesis And Properties
- Nanoplatforms for cancer theranostics
- Semiconductor Quantum Structures and Devices
- Photorefractive and Nonlinear Optics
- Microwave Engineering and Waveguides
- Conducting polymers and applications
- Optical Coherence Tomography Applications
- Nonlinear Waves and Solitons
Harbin Institute of Technology
2008-2025
Shenzhen Institute of Information Technology
2008-2024
University Town of Shenzhen
2021-2024
Peng Cheng Laboratory
2024
Carnegie Mellon University
2024
Ministry of Education of the People's Republic of China
2019-2020
Northwest University
2019-2020
Materials Science & Engineering
2019-2020
China XD Group (China)
2019-2020
Omega Optics (United States)
2014-2019
Because of their weak interlayer bonding, van der Waals (vdW) solids are very sensitive to external stimuli such as strain. Experimental studies strain tuning thermal properties in vdW have not yet been reported. Under ∼9% cross-plane compressive created by hydrostatic pressure a diamond anvil cell, we observed an increase conductivity bulk MoS_{2} from 3.5 about 25 W m^{-1} K^{-1}, measured with picosecond transient thermoreflectance technique. First-principles calculations and coherent...
Abstract In two dimensional (2D) transition metal dichalcogenides, defect-related processes can significantly affect carrier dynamics and transport properties. Using femtosecond degenerate pump-probe spectroscopy, exciton capture, release by mid-gap defects have been observed in chemical vapor deposition (CVD) grown monolayer MoSe 2 . The defect state filling shows a clear saturation at high densities, from which the density is estimated to be around 0.5 × 10 12 /cm capture time extracted...
Two distinct stacking orders in ReS2 are identified without ambiguity and their influence on vibrational, optical properties carrier dynamics investigated. With atomic resolution scanning transmission electron microscopy (STEM), two determined as AA with negligible displacement across layers, AB about a one-unit cell along the axis. First-principle calculations confirm that these correspond to local energy minima. Raman spectra inform consistent difference of modes I & III, 13 cm-1 for...
The intriguing and anomalous optical characteristics of exceptional points (EPs) in resonators have attracted significant attention. While EP-related phenomena been observed by perturbing with off-chip components, implementing EPs fully on-chip remains challenging due to their extreme susceptibility fabrication errors. In this Letter, we propose a succinct compact approach reach EP an integrated silicon microring resonator manipulating the evolution backscatterings two nanocylinders...
Stimulated Brillouin scattering (SBS) provides a robust and versatile foundation for the development of mode-locked lasers, microwave signal generators, optical gyroscopes across diverse platforms. Nonetheless, relatively low efficacy interactions in traditional silicon photonic waveguides presents barrier to advances silicon-based laser technology. The emergence hybrid photonic-phononic has brought light adaptable nature silicon, marking significant advancement. Here we numerically...
Silicon platforms are widely recognized as an industry standard for photonic integrated circuits. However, conventional tuning mechanisms, such thermo-optic and plasma dispersion effects, impose limitations in advanced applications, quantum computing, where low-loss cryogenic operation critical. Acousto-optic (AO) modulation offers a promising alternative, broadening the scope of silicon photonics. Here, we investigate aluminum nitride (AlN)-silicon hybrid platform to enable AO on...
Understanding defect effect on carrier dynamics is essential for both fundamental physics and potential applications of transition metal dichalcogenides. Here, the phenomenon oxygen impurities trapping photo-excited carriers has been studied with ultrafast pump-probe spectroscopy. Oxygen are intentionally created in exfoliated multilayer MoSe2 Ar+ plasma irradiation air exposure. After treatment, signal transient absorption first increases then decreases, which a signature capturing...
This work investigates the impact of carrier noise induced by an external current source on linewidth enhancement factor (LEF) and relative intensity (RIN) a 100 GHz quantum dot fourth-order colliding-pulse mode-locked laser (MLL), driven normal pump with Gaussian-distributed sequences quiet sub-Poissonian-distributed sequences. The results indicate that under pump, LEFs are approximately zero for reverse saturable absorber (SA) bias voltages ranging from 0 to 2.5 V, achieves RIN as low -156...
Abstract Thermoelectric properties of camphorsulfonic acid (CSA) doped conducting polyaniline with different structures have been studied. The sample special submicron-fibre structure exhibited 20 times higher thermoelectric power factor at 300 K than the general grain structure, which could be ascribed to its carrier mobility caused by order chain packing.
We experimentally demonstrate an ultra-compact polarization-independent 3 dB power splitter on the silicon-on-insulator platform. Subwavelength structure engineering is employed to balance coupling coefficients of TE and TM polarizations as well a footprint reduction. The device possesses ( <mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"> <mml:mrow class="MJX-TeXAtom-ORD"> <mml:mn>1.2</mml:mn> </mml:mrow> <mml:mspace width="thickmathspace"/> <mml:mtext>µ</mml:mtext>...
Abstract Dense waveguide arrays with half‐wavelength pitch, low‐crosstalk, broadband, and flexible routing capability are essential for integrated photonics. However, achieving such performance is challenging due to the relatively weaker confinement of dielectric waveguides increased interactions among densely packed waveguides. Here, leveraging artificial gauge field mechanism, half‐wavelength‐pitched dense arrays, consisting 64 waveguides, in silicon −30 dB crosstalk suppression from 1480...
Because of the high index contrast, current silicon photonics based optical phased arrays cannot achieve small beam divergence and large field-of-view simultaneously without increasing fabrication complexity. To resolve dilemma, we propose an ultra-long waveguide grating antenna formed by placing subwavelength segments within evanescent field a conventional strip waveguide. Bound state in continuum effect is leveraged to suppress sidewall emission. As proof concept, theoretically...
Herein, we report a one-pot one-step method for the preparation of Au@SiO2 core-shell nanoparticles (NPs) via facile heating treatment an alcoholic-aqueous solution chloroauric acid (HAuCl4), 2-methylaminoethanol (2-MAE), cetyltrimethylammonimum bromide (CTAB), and tetraethylorthosilicate (TEOS). The size Au core thickness silica shell can be easily controlled by simply adjusting volume HAuCl4 TEOS, respectively, which hardly achieved other approaches. as-prepared NPs exhibited...
Relying on the nonlinear multimode interference in fibers and polarization rotation, these two mode-locked techniques are combined our proposed fiber laser. Stable optical soliton multi-pulse regimes with a constant frequency of 11.44 MHz have been generated experimentally. Through altering intra-cavity conditions, bound-state pulses diverse properties observed. To best knowledge, obtained pulse constituted by more than thirty sub-pulses is achieved for first time. Moreover, center...
In this paper, a model describing the four-wave mixing (FWM) among an arbitrary amount of incident waves is derived and predictor-corrector method exploited to solve equations. Based on numerical model, we studied methods promote energy exchange waves. The results show that proper value phase mismatch can accelerate exchanging pump simultaneously reduces idler wave powers. This applied investigate behavior multiwavelength erbium-doped fiber laser (MWEDFL) exploiting FWM. According...
An amorphous film of the third-order nonlinear optical material DDMEBT was spun onto silicon chips for first time, filling 80 nm lithographic features. A 710 μm² device designed, fabricated, and tested that acts both as a resonator switch an input/output grating coupler to perfectly vertical single mode fiber. Autocorrelation spectral measurements indicate has <1 ps response 4 switching bandwidth, dB on/off contrast. With sufficient power, this all-optical can potentially modulate carrier...
This work experimentally and theoretically demonstrates the effect of excited state lasing on reflection sensitivity dual-state quantum dot lasers, showing that laser exhibits higher to external optical feedback when reaching threshold. can be degraded by increasing excited-to-ground-state energy separation, which results in a high threshold ratio. In addition, occurrence decreases damping factor increases linewidth enhancement factor, leads low critical level. These findings illuminate path...