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We introduce a virtual source that generates a family of a Pearcey wave. We derive a closed-form expression for the (1+1)-dimensional Pearcey wave that in the appropriate limit yields the paraxial accelerating and non-diffracting Pearcey beam (PB). From the perturbative series representation of a complex-source-point spherical wave, we derive an infinite series nonparaxial correction expression for...
We theoretically and experimentally demonstrate self-accelerating Bessel-like optical beams propagating along arbitrary trajectories in free space. Such beams possess nearly symmetric nondiffracting main lobes and exhibit self-healing properties, promising for a variety of applications.
We demonstrate theoretically and experimentally that optical vortices can be navigated along arbitrary trajectories with a preserving donut-shaped main lobe. The possibility of using such self-accelerating vortex-Bessel-like optical beams for particle manipulation is also illustrated.
The GaN-based light emitting diodes (LEDs) and laser diodes (LDs) have extensive applications in LED display, high brightness illumination, traffic signals, streetlights, automotive for LEDs, and high density optical storage, full-color display, laser printing, and laser lighting for LDs. The progress of the GaN-based LEDs and LDs is introduced. There are many universities and companies focusing on...
The magnetic and specific-heat properties of the multiferroic YCrO3 chromites have been investigated in a temperature range of 2–300K. The results show that spin canted antiferromagnetic ordering of Cr3+ (S=3/2) around 140K. At elevated temperature all susceptibility follow the Curie-Weiss law and the corresponding effective magnetic moment µeff=3.99µB, which is closed to the theoretical value for...
Nontoxic lead-free magnetoelectric ceramics were successfully prepared by incorporating the dispersed ferromagnetic Ni-ferrite particles into (K0.5Na0.5)NbO3-based ferroelectric matrix. The multiferroicity of the ceramics were verified by P-E loops and magnetic hysteresis loops. Dielectric properties and magnetoelectric coefficients as a function of frequency were measured in the range of 100 Hz to...
The ytterbium orthochromate YbCrO3 has a strong anisotropic exchange interaction between Cr3+ and Yb3+ ions which makes the compound exhibits negative magnetization when magnetization-temperature curves are measured in a field-cooled mode with low applied field (100 Oe). YbCrO3 is a canted antiferromagnet (CAFM) below Néel temperature TN=118 K. To investigate the interaction between Cr3+ and Yb3+,...
AlGaN/GaN high electron mobility transistors (HEMTs) were grown on Si substrates by MOCVD. In the HEMT structure, the 1 μm GaN buffer layer was partially doped with Mg in an attempt to increase the resistivity and minimize the buffer leakage current. Afterwards, an AlN spacer layer was inserted between the AlGaN barrier layer and the GaN channel layer to effectively reduce impurity scattering and...
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