A5056596638- Orbital Angular Momentum in Optics
- Magnetic and transport properties of perovskites and related materials
- Advanced Condensed Matter Physics
- Photonic Crystals and Applications
- Metamaterials and Metasurfaces Applications
- Cold Atom Physics and Bose-Einstein Condensates
- Near-Field Optical Microscopy
- Atomic and Subatomic Physics Research
- Photonic and Optical Devices
- Advanced Frequency and Time Standards
- Plasmonic and Surface Plasmon Research
- Laser-Matter Interactions and Applications
- Advanced Antenna and Metasurface Technologies
- Advanced Fiber Optic Sensors
- Fern and Epiphyte Biology
- Optical Coatings and Gratings
- Terahertz technology and applications
- Adaptive optics and wavefront sensing
- Optical measurement and interference techniques
- Thermal Expansion and Ionic Conductivity
- Optical Coherence Tomography Applications
- Quantum optics and atomic interactions
- Electronic and Structural Properties of Oxides
- Rare-earth and actinide compounds
- Advanced optical system design
Harbin Engineering University
2024
Ministry of Industry and Information Technology
2024
University of Shanghai for Science and Technology
2008-2021
Missouri University of Science and Technology
2015
Shanxi University
2004-2009
State Key Laboratory of Quantum Optics and Quantum Optics Devices
2004-2009
We present an analytical nonlocal effective medium approximation to describe the optical effects in metallic nanorod metamaterials based on Mie scattering theory. It is shown that developed theory can predict a coexistence state of two modes around epsilon-near-zero region, where strong lead behavior both positive refraction and negative metamaterials. Outside only one mode be excited its well described using local
We theoretically and experimentally study the propagation properties of circular Airy beam (CAB) with a Gaussian envelope in Fourier space. The two parameters function can be used to control distribution spatial frequency, thus tune this modified CAB. When are chosen appropriately, size focal spot will reduced, maximum intensity especially abruptly autofocusing property greatly enhanced. Meanwhile, position remain almost same common experimental results show that proposed generated...
We theoretically study the propagation properties of vector circular Airy vortex beam in detail. The results show that orbital angular momentum can induce a localized spin after autofocusing paraxial regime, which leads to an abrupt polarization transition just before focal plane. However, there is no conversion from during whole process. provide intuitive explanation for appearance such localization. This investigation expected advance our understanding and optical spin-orbit coupling.
In the process of acquiring astronomical spectral data, alignment accuracy between fiber core in focal plane and image target star is crucial for multi-target telescopes. This work presents a Special-shaped Micro-lens Aimer Real-time Targeting (SMART), which combines special-shaped microlens bundle to carry out online alignments improve injection efficiency fiber. The consists central plate six side microlenses. transfers signal science without ratio degradation. microlenses focus leakage...
We propose and demonstrate that a dark spot can be generated by radially polarized beam with first-order vortex after phase modulation an optimal binary element. The distance between two mainlobe intensity peaks along the radial direction is 0.62λ on focal plane. proposed system easy to implement in practice has low energy loss, since it uses phase-only modulation. Then, fluorescent calculated for stimulated emission depletion microscopy when works as pump beam. FWHM of achieve 0.008λ...
A novel scheme of transferring cold atoms in a double magneto-optical trap (MOT) system has been experimentally demonstrated. Cold cesium trapped vapor-cell MOT are efficiently transferred to an ultrahigh-vacuum (UHV) by continuous-wave divergent Gaussian transfer laser beam. When large red detuning and moderate intensity adopted for the beam, enhancement recapturing UHV is clearly observed. Using beam (diameter approximately 1.60 mm region) with typical power 20.2 mW, up 85% efficiency...
By using a sol-gel clue, set of polycrystalline perovskite samples La1−xAgxMnO3 with nominal doping level x ranging from 0.05 to 0.45 has been synthesized. The chemical composition and the magnetism were investigated. A little Ag was found seeping in sintering process when exceeded temperature higher than 700°C resulting being multiphase. magnetic transition points have decrease increasing temperature. concentration-dependent Tc similar that bivalent metal ion doped perovskite, obtained. We...
A scheme for forming high-quality vortex laser beams by employing spiral phase elements inside a resonator is presented theoretically. The calculated results show that the purity of generated mode will decrease slightly as order increases. However, can achieve higher than 0.97 even high-order mode. More important, value orbital angular momentum controllable. Then, influence production and alignment errors, including number levels elements, surface roughness reflective mirrors, decenter...
A scheme for forming high-quality circular Airy beams inside the laser resonator is presented theoretically. The desired beam can be generated when common reflective mirror replaced by a designed diffractive optical element. mode in proposed cavity stimulated using so-called eigenvector method. calculated results show that parameters of controlled changing phase distribution loss very low, which close to fundamental Gaussian mode. purity high, much better than from phase-only encoding method...
We experimentally and theoretically investigate the Gouy phase shift of longitudinal terahertz (THz) wave in entire focal region. By comparing pulses shape orientation before after focus, we find that complete for field components is same to transverse components, with value π. The only different between them their difference π/2. These results have important implications near-field optical microscopy super-resolution imaging.
We investigate the phase noise of a diode laser based on interferometric self-mixing effect. A detuned Fabry-Perot cavity converts into intensity noise, and is measured by novel method as function amount feedback distance between target front facet. Experimental results can be well explained theory.
We report the basic idea and experimental demonstration of measuring temperature cold cesium atomic cloud confined in a magneto-optical trap (MOT) by analyzing absorption spectrum observed short-distance time-of-flight (TOF) method. Compared with conventional TOF scheme, we measure MOT method for our small vapor cell. If is released, it will fall expand due to gravity its initial velocity distribution. Utilizing cylindrical resonant probe beam positioned several millimeters beneath (in this...
We have established a caesium double magneto-optical trap (MOT) system for cavity-QED experiment, and demonstrated the continuous transfer of cold atoms from vapour-cell MOT with pressure ~ 1×10−6 Pa to ultra-high-vacuum (UHV) 8×10−8 via focused continuous-wave laser beam. The effect frequency detuning as well intensity beam is systematically investigated, which makes transverse cooling adequate before leak out reduce divergence atomic typical flux got 2×107 atoms/s. About 5×106 are...
Absorption spectra of cold caesium atoms confined in a magneto-optical trap are measured around D2 line at 852nm with weak probe beam. reduction dip due to electromagnetically induced transparency (EIT) effect by the cooling/trapping field V-type three-level system and gain peak near cycling transition clearly observed. Several mechanisms mixed EIT normal briefly discussed. A simple theoretical analysis based on dressed-state model is presented for interpretation absorption spectra.