A5052894051- Photonic and Optical Devices
- Particle accelerators and beam dynamics
- Particle Accelerators and Free-Electron Lasers
- Mechanical and Optical Resonators
- Superconducting Materials and Applications
- Phase-change materials and chalcogenides
- Advanced Fiber Laser Technologies
- Luminescence Properties of Advanced Materials
- Plasmonic and Surface Plasmon Research
- Orbital Angular Momentum in Optics
- Luminescence and Fluorescent Materials
- Mineralogy and Gemology Studies
- Quantum optics and atomic interactions
- Spectroscopy and Quantum Chemical Studies
- Semiconductor Lasers and Optical Devices
- Gas Sensing Nanomaterials and Sensors
- Laser-Matter Interactions and Applications
- Nuclear Physics and Applications
- Near-Field Optical Microscopy
- Nonlocal and gradient elasticity in micro/nano structures
- Analytical Chemistry and Sensors
- Ga2O3 and related materials
- Advanced Fiber Optic Sensors
- Advancements in PLL and VCO Technologies
- Cultural Heritage Materials Analysis
University of Colorado Boulder
2020-2024
China University of Geosciences (Beijing)
2023
Chinese Academy of Geological Sciences
2023
University of Colorado System
2021-2022
Hunan Normal University
2015
Chinese Academy of Sciences
2012
Institute of High Energy Physics
2012
University of Science and Technology of China
2000
In this study, seventeen faceted gem-quality chrysoberyls exhibiting an attractive canary yellow color were investigated by a series of gemological, spectral, and chemical methods. Microscopic observation reveals distinct growth lines inclusions, including CO2 fluids, carbon, mineral crystals such as calcite, quartz, sillimanite, mica, identified the Raman spectrum. The FTIR spectrum exhibits 2405 2160 cm-1 feature peaks 3223 peak in all samples, which can be accompanied 3112 shoulder, 3301,...
A flexible high power RF test stand has been designed and constructed at IHEP to a variety of 500 MHz superconducting components for the upgrade project Beijing Electron Positron Collider (BEPC II), such as input coupler, higher order modes (HOMs) absorber so on. coupler conditioned tested with up 250 kW in continuous wave (CW), traveling (TW) mode 150 CW standing (SW) mode. prototype HOMs absorb 4.4 kW. An introduction design, construction tests is presented this paper.
We demonstrate the fabrication of high Q Ge28Sb12Se60 ring resonators in an all chalcogenide platform through electron-beam lithography, lift-off and thermal reflow. achieve a factor (3.9 ± 0.2) × 105 reflowed (2.5 reactive ion etched at 1550 nm. measure line roughness these devices to estimate scattering loss. determine material losses waveguide find additional 1.1 dB/cm excess loss from surface absorption. fabricate Ge23Sb7S70 waveguides with 0.6 show that do not experience same kind when...
A plasmonic nanostructure with lanthanide-doped upconversion nanoparticles for an improved ratiometric sensing platform.
Abstract This study concerns with nonlinear axial and lateral vibrations of nanoscaled beams under action bidirectional support excitations. Using the Euler-Bernoulli beam model through considering von-Karman terms, small-scale effect, surface energy, equations motion an excited nanobeam are derived in terms purely dynamical deformations. By utilizing Galerkin approach on basis appropriate modes, resulting reduced to ordinary differential equations, these solved for unknown elastic...
We fabricated single mode Ge28Sb12Se60 waveguides and resonators using e-beam lithography achieved a propagation loss of 3.88 dB/cm at 3.66 µm. compared BCl3 CHF3 etch chemistries determined produced 1.5 higher losses 3.6 µm due to C-H bond absorption. use detect an aromatic aldehyde dissolved in non-polar solvent with limit detection 1.09 µmol/mL. then reduce this 0.25 µmol/mL the enhancement by chalcogenide ring resonator.
Plasmonic nanostructures can be used to enhance the efficiency of upconversion nanoparticles (UCNPs) and enable new functionalities. However, fabrication these hybrid plasmon-UCNP has traditionally relied on either wet chemistry or nanolithography routes that are difficult control, scale up, both. In this work, we present a scalable nanofabrication process, capable producing massive array gold-UCNP over few mm2 area with excellent uniformity in photoluminescence intensity. This approach...
We report a novel force sensor exploiting the interaction between plasmonic nanostructures and upconversion nanoparticles (UCNPs). The nanosensor is composed of gold nanodisk UCNPs separated by flexible polymer layer. designed to exhibit plasmon resonance that selectively enhances one emission bands while leaving other ones largely unaffected. As compressed or stretched an external force, layer thickness changes, modulating plasmon-UCNP coupling. resulting changes in luminescence intensity...
We report Ge23Sb7S70 chalcogenide ring resonators with up to 8 × 104 quality factors operating around 3.6 µm wavelength fabricated through e-beam lithography. Their rib waveguide geometry can be engineered support close-to-zero dispersion modes needed for mid-infrared microcomb generation.
The tuning system plays a very important role when superconducting cavity is in operation. It cooperates with other control loops to adjust the frequency high precision, reduce reflection power, guarantee stability of beam, and ensure safety cavity. This paper focuses mainly on working principle, state problems that Beijing Electron Positron Collider (BEPC II) has encountered during
We report the first observation of cascaded forward stimulated Brillouin scattering in a microresonator platform. have demonstrated 25 orders intramodal Stokes beams separated by shift 34.5 MHz at sub-milliwatt threshold 1550 nm. An As2S3 microsphere diameter 125 µm with quality factor 1 × 106 was used for this demonstration. Theoretical modeling is to support our experimental observations and power. expect work will advance field integrated photonics, applications gas sensing photonic radio...
We fabricated GeSbSe waveguides and resonators using e-beam lithography achieved a propagation loss of 4.4 dB/cm in the mid-infrared region. Using these devices we demonstrated optical sensing aromatic aldehydes with limit detection 0.25 μ mol/mL.
The C-ADS project has started beam commissioning. ion source and LEBT been commissioned successfully, while the RFQ is under conditioning. Medium Energy Beam Transport line-1 (MEBT$$) place where extensive parameter measurement will be carried out. emittance one of most critical parameters which have to characterized. In injector-I, MEBT-1 installed three wire scanners measure sizes. transverse method using discussed in detail this paper.
We report Ge23Sb7S70 chalcogenide reflowed wedge resonators with up to 10 6 quality factors fabricated through reflow. The continuously varying sidewall angle can be engineered support flat, close-to-zero dispersion modes despite large material dispersion.
In this study, seventeen faceted gem-quality chrysoberyls exhibiting an attractive canary yellow color were investigated using a variety of gemological, spectral, and chemical methods. Microscopic observation revealed the presence distinct growth lines inclusions, including CO2 fluids, carbon, crystals mineral such as calcite, quartz, sillimanite, mica, identified by Raman spectrum. The FTIR spectra showed characteristic peaks 2405 2160 cm−1 3223 peak in all samples, which can be accompanied...
To test and verify the performance of digital low-level radio-frequency (LLRF) tuner system designed by IHEP RF group, an experimental platform with a retired KEK 1.3 GHz nine-cell cavity is set up. A (RF) field established successfully in frequency locked ±0.5° (about ±1.2 kHz) at room temperature. The LLRF performs well five-hour experiment, results show that achieves stability amplitude <0.1% (peak to peak) phase <0.1° peak). This index satisfies requirements International Linear Collider...
We report on an investigation of simultaneous generation several narrow-bandwidth laser-like coherent emissions from nitrogen molecular ions ( ) produced in intense mid-infrared laser fields. With systematic examinations the dependences gas pressure as well parameters including intensity, polarization and wavelength pump pulses, we reveal that multiple emission lines generated originate a series nonlinear processes beginning with four-wave mixing, followed stimulated Raman scattering. Our...
The existence of electronic coherence can fundamentally change the scenario nonlinear interaction light with quantum systems such as atoms and molecules, which, however, has escaped from observation in investigations strong field optics past several decades. Here, we report on generation by ionization nitrogen molecules an intense 800 nm laser field. is experimentally revealed observing a resonant four-wave mixing process which two pump pulses centered at 1580 wavelengths are temporally...
In order to overcome the low quantum yield of upconversion nanoparticles (UCNPs), plasmonic nanostructures have been used due their strongly modified local E-field. However, complex nature plasmon-upconversion interaction by field enhancement and luminescence quenching is not well appreciated in general. Here, we present a spectroscopic study on between NaYF4:Yb3+,Er3+ UCNPs gold nanostructures. The monitored as nanostructure geometry varied. interplay positive effect negative carefully...