Current Issue : October - December Volume : 2019 Issue Number : 4 Articles : 5 Articles
Lanthanum modified lead zirconate titanate (abbreviated as PLZT) Electro-Optical\nceramics with various Bi concentration were prepared by a hot-press process. The PLZT ceramic\nsamples all present a single perovskite structure with no second phase detected. Bi^3+ ion was\nconsidered to mainly enter the A-site of perovskite ABO3 structure of PLZT ceramics by the X-Ray\nDiffractionanalysis...................
Spontaneous emission of luminescent material is strongly dependent on the surrounding\nelectromagnetic environment. To enhance the emission rate of a single-photon emitter, we proposed\na wire-groove resonant nanocavity around the single-photon emitter. An InGaAs quantum dot\nembedded in a GaAs nanowire was employed as a site-control single-photon emitter. The nanoscale\ncavity built by a wire-groove perpendicular to the quantum dot with an extremely narrow width\nof 10 nm exhibited an extremely small volume of 10*40*259 nm^3. Theoretical analysis showed\nthat the emission rate of the quantum dot was dramatically enhanced by 617x due to the Purcell\neffect induced by the wire-groove cavity. A fast single-photon emitter with a rate of 50.2 GHz can be\nobtained that speeds up the data rate of the single-photon emitter. This ultrafast single-photon source\nwould be of great significance in quantum information systems and networks....
Ge-Sb-Te thin films were obtained by ns-, ps-, and fs-pulsed laser deposition (PLD) in\nvarious experimental conditions. The thickness of the samples was influenced by the Nd-YAG\nlaser wavelength, fluence, target-to-substrate distance, and deposition time. The topography and\nchemical analysis results showed that the films deposited by ns-PLD revealed droplets on the surface\ntogether with a decreased Te concentration and Sb over-stoichiometry. Thin films with improved\nsurface roughness and chemical compositions close to nominal values were deposited by ps- and\nfs-PLD. The X-ray diffraction and Raman spectroscopy results showed that the samples obtained\nwith ns pulses were partially crystallized while the lower fluences used in ps- and fs-PLD led to\namorphous depositions. The optical parameters of the ns-PLD samples were correlated to their\nstructural properties....
We developed high-speed time-domain (TD) en face optical coherence tomography\n(OCT) system using KTN optical beam deflector. The KTN optical\nbeam deflector operates at a high repetition rate of 200 kHz with a fairly large\nbeam deflection angle. We proposed a high-speed en face OCT system that\nused a KTN optical deflector as the sample beam scanning. In the experiment,\nwe obtained en face OCT images of human fingerprint with a frame rate of\n800 fps, which is the fastest speed obtained by a TD-OCT imaging. Furthermore,\na 3D-OCT image was also obtained at 0.2 s (=5 volumes/s) by our imaging\nsystem....
In this article, we present a simple and intuitive approach to create a handheld optoacoustic\nsetup for near field measurements. A single piezoelectric transducer glued in between two sheets of\npolymethyl methacrylate (PMMA) facilitates nearfield depth profiling of layered media. The detector\nelectrodes are made of indium tin oxide (ITO) which is both electrically conducting as well as optically\ntransparent, enabling an on-axis illumination through the detector. By mapping the active detector\narea, we show that it matches the design form precisely. We also present a straightforward approach\nto determine the instrument response function, which allows to obtain the original pressure profile\narriving at the detector. To demonstrate the validity of this approach, the measurement on a simple\ntest sample is deconvolved with the instrument response function and compared to simulation results.\nExcept for the sputter instrumentation, all required materials and instruments as well as the tools\nneeded to create such a setup are available to standard scientific laboratories....
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