A5091712567- Plasmonic and Surface Plasmon Research
- Optical Coatings and Gratings
- Photonic and Optical Devices
- Gold and Silver Nanoparticles Synthesis and Applications
- Near-Field Optical Microscopy
- Photonic Crystals and Applications
- Organophosphorus compounds synthesis
- Advanced biosensing and bioanalysis techniques
- Asymmetric Hydrogenation and Catalysis
- Semiconductor Lasers and Optical Devices
- Nonlinear Optical Materials Studies
- Metamaterials and Metasurfaces Applications
- Advanced Fluorescence Microscopy Techniques
- Orbital Angular Momentum in Optics
- Plant responses to water stress
- Optical Wireless Communication Technologies
- Chemical Reaction Mechanisms
- Laser-Ablation Synthesis of Nanoparticles
- Nanoplatforms for cancer theranostics
- bioluminescence and chemiluminescence research
- Sulfur Compounds in Biology
- Catalytic Cross-Coupling Reactions
- Cyclopropane Reaction Mechanisms
- Microwave Engineering and Waveguides
- Nonlinear Optical Materials Research
Shihezi University
2024
University of Utah
2007-2017
University of Science and Technology of China
2002-2007
University of Antwerp
1994-1996
Beijing University of Agriculture
1992
IHI Corporation (United States)
1981-1982
Embedding nonlinear media in the slit region of metallic nano-optic lens is proposed as a new method active modulating output beam. Two important phenomena, beam deflection and focusing, have been studied detail. A developed Finite Difference Time Domain (FDTD) has performed to account for response. The simulated results show that angle focus length can be controlled easily by intensity incident light structures. physical principle phenomena explained Surface Plasmons (SPs) excitation...
We measure second-harmonic generation from arrays of sub-wavelength apertures in transmission using fundamental input at 800 nm. Lattice arrangements include disordered, Penrose (quasi-periodic or aperiodic), and square (periodic). Strong angular dependence SHG is observed, with maxima located positions that roughly correspond to incidence angles extraordinary optical (EOT) for the fundamental. In addition, even normal sample, strong secondary are observed off-normal scattering higher degree...
We report excited-state lifetime modification of diffusing molecules by Al nanoapertures in the UV. Lifetime reductions ∼3.5× have been observed for high quantum yield laser dye p-terphenyl a 60 nm diameter aperture. The reduction is smaller low molecule tryptophan, which maximum ∼1.7 observed. as function aperture size and native accurately predicted simulation. Simulation further predicts greater net fluorescence enhancement tryptophan compared to p-terphenyl, consistent with expectation...
Through rational design, we compare the performance of three plasmonic antenna structures for UV fluorescence enhancement. Among metrics considered are local increase in excitation intensity and quantum efficiency, product which represents net With realistic aluminum, predict that greater than 100× enhancement can be obtained.
Aluminum and magnesium have a strong plasmonic response in the ultraviolet part of spectrum. Due to differences their dielectric responses, however, there are qualitative fluorescence enhancement factors for Al Mg nanoapertures. In order make our results applicable experimental studies, we further investigate these nanoapertures using UV emitters that excite near 270 nm emit 340 with both high low quantum yields (QY). Our suggest may perform better molecules QY, while QY. We consider effects...
A developed two-dimensional Finite Difference Time Domain (FDTD) method has been performed to investigate the optical bistability in a subwavelength metallic grating coated by nonlinear material. Different loops have shown depend on parameters of structure. The influences two key parameters, thickness material and slit width grating, studied detail. effect structure is explained Surface Plasmons (SPs) mode resonant waveguide theory.
We measure third-harmonic generation (THG) from arrays of sub-wavelength metal apertures in transmission using fundamental input at 800 nm. Samples with different aperture spacings, sizes, and shapes are used. Strong angular dependence THG is observed, maxima located incidence angles corresponding to extraordinary optical (EOT) for the fundamental. demonstrate an anomalous scaling TH intensity size, where EOT peaks, may either increase or decrease size. The shape also shown have a strong...
We demonstrate that the inclusion of aluminum (Al) seed layers allows for growth finer grain, smoother magnesium (Mg) films, allowing improved plasmonic response in UV spectral range. deposit Al and Mg films using DC/RF magnetron sputtering. For layer thicknesses 2, 5, 10 15 nm, we measure corresponding optical constants over wavelength range 250 to 600 nm a variable angle spectroscopic ellipsometer compare results reference 100 thick film deposited without layer. The depend on surface...
Metallic waveguide theory has been used to design subwavelength metallic grating structure which can excite the modes, especially low frequency coupled surface plasmons mode, achieve sub-50nm resolution lithography pattern by using light with 436nm wavelength. The Finite Difference Time Domain method performed analyze performance of generated two possible schemes. One named metal-layer scheme utilizes three different modes (two and one non-coupled plasmons) on metal layer generate patterns...
The composite PMMA films containing Ag nanoparticles and rhodamine 6G are prepared. We investigate the fluorescence properties nonlinear optical of R6G/PMMA influenced by nanoparticles. enhancement factor is about 3.3. corresponding refractive index measured to be −2.423×10−8 esu using Z-scan technique, which much enhanced compared with film. results indicate that these enhancements attributed surface plasmon resonance
Planar polymer multi-model waveguides doped with Ag nano-particles and rhodamine B are fabricated investigated by the spectroscopy analysis method as well M-line method. Experimental results shown that fluorescence enhancement occurs when excited a wide band wavelength nano-particle concentration at certain level. The maximum factor in our experiment is obtained to be about 3.8 350 nm. Our study may have potential applications polymers optical elements, such waveguide lasers amplifiers.
Two-dimensional finite-difference time-domain (FDTD) method has been performed to numerically investigate the transmission through a one-dimension cupped surface metallic grating structure. The concept of coupling optical modes in notches and main slits, introduced by Crouse Keshavareddy [1], is examined further our work. Unexpected phenomenon shown that even horizontal plasmons (HSPs) are inhibited, still can be enhanced or suppressed. And periodicity depending on phase change light...
In the category of drugs approved by U.S. FDA, pyrrolidine is most frequently used core five-membered nonaromatic heterocycles containing nitrogen. Herein, a Rh(II)/Pd(0) dual-catalyzed carbenoid N-H insertion/allylation cascade reaction has been developed. This protocol provide an efficient approach for construction diverse highly functionalized and polysubstituted pyrrolidines in high yields (up to 91%) with excellent chemoselectivities diastereoselectivities (>20:1) under mild conditions.