Wang-zhou Shi

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We report on the first terahertz (THz) emitter based on femtosecond-laser-ablated gallium arsenide (GaAs), demonstrating a 65% enhancement in THz emission at high optical power compared to the nonablated device. Counter-intuitively, the ablated device shows significantly lower photocurrent and carrier mobility. We understand this behavior in terms of(More)
We observe an enhancement of optical absorption and photocurrent from semi-insulating gallium arsenide (SI-GaAs) irradiated by femtosecond laser pulses. The SI-GaAs wafer is treated by a regeneratively amplified Ti: Sapphire laser of 120 fs laser pulse at 800 nm wavelength. The laser ablation induced 0.74 μm periodic ripples, and its optical absorption-edge(More)
Ni-doped ZnO films were deposited on Si(100) by pulsed laser deposition(PLD) at room temperature. Fluorescence emission properties of the films were measured using VARAIN Cary-Eclips 500 fluorescence spectrum analyzer. Two peaks centered respectively at about 360 and 380 nm were observed. The origin of the ultraviolet peak at 360 nm was investigated through(More)
O and N-doped amorphous Si-based films were prepared by magnetron sputtering. The photoluminescence (PL) spectra from the films were measured. A series of intense PL bands located in red, green, blue, violet and ultraviolet regions were observed, whose intensities were affected by the contents of O and N and the temperature of the substrate (Ts) during(More)
The absorbent performance of polyamide resin has been studied. Au(III) and Ag(I) easily react with [SCN]- to form complex anions in dilute nitric acid medium, and be adsorbed on the polyamide resin to enrich, and be separated from many other base metals. When Na2SO3 and NH3 x H2O is used as eluating agent, Au and Ag can be recovered quantitatively. Therein(More)
YMnO3 thin films deposited on Si (100) substrate by pulsed laser deposition at room temperature were annealed at different temperatures. The microstructure and fluorescent emission properties of these films were studied using XRD and UV-Vis spectroscopy. The results show that polycrystalline YMnO3 thin films can be obtained through post-annealing, in which(More)
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