Yong Zhang

University of North Carolina at Charlotte, Charlotte, North Carolina, United States

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Publications (6)19.51 Total impact

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    ABSTRACT: We explore a strongly interacting QDs/Ag plasmonic coupling structure that enables multiple approaches to manipulate light emission from QDs. Group II-VI semiconductor QDs with unique surface states (SSs) impressively modify the plasmonic character of the contiguous Ag nanostructures whereby the localized plasmons (LPs) in the Ag nanostructures can effectively extract the non-radiative SSs of the QDs to radiatively emit via SS-LP resonance. The SS-LP coupling is demonstrated to be readily tunable through surface-state engineering both during QD synthesis and in the post-synthesis stage. The combination of surface-state engineering and band-tailoring engineering allows us to precisely control the luminescence color of the QDs and enables the realization of white-light emission with single-size QDs. Being a versatile metal, the Ag in our optical device functions in multiple ways: as a support for the LPs, for optical reflection, and for electrical conduction. Two application examples of the QDs/Ag plasmon coupler for optical devices are given, an Ag microcavity + plasmon-coupling structure and a new QD light-emitting diode. The new QDs/Ag plasmon coupler opens exciting possibilities in developing novel light sources and biomarker detectors.
    Small 04/2014; · 7.82 Impact Factor
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    ABSTRACT: Intra-peritoneal bladder and visceral injuries from impalement of the perineum in women are exceedingly rare. This kind of injury has not been previously reported in a pregnant woman. The evaluation and surgical management of a pregnant woman is a challenging surgical problem. Preoperative evaluation of the uterus and fetus is balanced with minimal use of radiographic studies. Multiple organs can be damaged with this type of injury, necessitating careful evaluation and operative planning. We report a rare case of transvaginal impalement injury with through-and-through bladder rupture and intra-peritoneal injury in a 5 months pregnant woman. We discuss diagnostic and management strategies and review the literature.
    International Urology and Nephrology 12/2013; · 1.33 Impact Factor
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    ABSTRACT: The lattice-structure-mismatched CdTe/PbTe heterostructures are emerging materials with unique properties and promising applications in midinfrared optoelectronics and spintronics. High-density two-dimensional electron gas at the metastable twisted interfaces of CdTe/PbTe (111) is investigated experimentally and theoretically. CdTe thin films grown on PbTe(111) using molecular-beam epitaxy are found to have high electron mobilities and carrier concentrations from Hall-effect measurements: 2.02×104 cm2/V s and 4.5×1018 cm−3 at 2 K, and 6.70×103 cm2/V s and 6.0×1019 cm−3 at 77 K. Our density-functional theory modeling reveals that the epitaxially grown CdTe/PbTe (111) heterostructures form metastable twisted interfaces that exhibit unusual structural and electronic properties: (1) The PbTe epilayer on CdTe(111) substrates is structurally highly distorted from the rocksalt structure within the first ∼4.5 nm from the interface, which is caused by the stereochemical activity of the Pb s2 lone pair. (2) The CdTe eplilayer on the PbTe(111) forms spontaneously a high density two-dimensional electron gas (2DEG) over 1013 cm−2 near the interface, without the need for doping, which explains the experimentally observed high carrier density and mobility. It is a much simpler heterostructure yet able to offer high electron mobility comparable to and one or two order magnitude higher sheet carrier density than the best achieved values for those of Si and II-VI based quantum well structures relying on modulation doping.
    Physical Review B 06/2013; 87(23). · 3.77 Impact Factor
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    ABSTRACT: The heterostructures of (zinc-blende)–CdTe/(rock-salt)–PbTe are typically found to have their common cubic axes aligned to each other, as in the case of PbTe quantum dots embedded in a CdTe matrix. In this work, we perform both theoretical and experimental studies on the CdTe/PbTe heterostructure in a different geometry: a planar CdTe/PbTe (111) heterostructure. We simulate the epitaxial growth of CdTe (PbTe) on the (111) PbTe (CdTe) substrate, using a density-functional theory. A twisted CdTe/PbTe (111) interface structure has been predicted in the layer-by-layer epitaxial growth on the (111) substrate, in contrast to the non-twisted CdTe/PbTe (111) interface reported in the literature. This predicted structure has been confirmed experimentally in the heterostructure grown by molecular beam epitaxy, using a high-resolution transmission electron microscope. The twisted interface has a lower binding energy than the non-twisted one, indicating that the twisted structure is a metastable phase formed in the non-equilibrium growth process. Additionally, the interface reconstructions of the CdTe/PbTe (111) heterostructure observed by reflection high-energy electron diffraction are explained using the twisted interface model.
    New Journal of Physics 11/2012; 14(11):113021. · 4.06 Impact Factor
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    ABSTRACT: The goal of this study was to explore minimally invasive transurethral imaging and surgery for the treatment of severe, persistent hematospermia in cases that were refractory to conservative treatments. The study included 43 patients (aged 22-77 years; average, 44.6 years) with long-lasting, severe hematospermia, accompanied by discomfort or pain in the lumbosacral or perineal region, dysuria, frequent micturition, decreased semen volume, and/or azoospermia. Patient symptoms had persisted for 1 to 10 years (average, 5.3 years). Computed tomography or magnetic resonance imaging of each patient was evaluated, and transurethral surgery was performed. The causes of hematospermia were identified in all 43 patients, and their ejaculatory duct obstruction or seminal vesiculitis was successfully treated. No serious intraoperative or postoperative complications occurred. Pathologic analyses revealed that all of the resected or biopsied seminal vesicle tissues had chronic nonspecific inflammation in the seminal vesicle wall, and no tumors were identified. Preoperative symptomology of hematospermia disappeared in all patients followed up for 2 to 30 months (average, 16 months). A single patient experienced recurrence at 11 months and had a second minimally invasive surgery that was curative. A total of 95.3% (41 of 43) of the patients experienced normal orgasmic intensity after surgery. Magnetic resonance imaging is a valuable and accurate diagnostic method for the identification of causative factors underlying hematospermia. Transurethral dilation of ejaculatory ducts, incision of the verumontanum or the distal end of the ejaculatory ducts, and incision or resection of the relevant cysts represent simple, safe, and reliable approaches for the management of refractory cases of hematospermia that do not respond to conservative treatments.
    Journal of Andrology 02/2012; 33(5):906-16. · 2.53 Impact Factor
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    ABSTRACT: To evaluate the effect of testis homotransplantation in the treatment of androgen deficiency and infertility. We retrospectively analyzed 12 cases of testis homotransplantation. Surgical success was achieved in 11 cases, all with a significantly increased level of serum testosterone, and markedly improved secondary sex characteristics and sexual function. Testis homotransplantation is highly effective for the treatment of androgen deficiency in males, but has little effect on spermatogenesis.
    Zhonghua nan ke xue = National journal of andrology 04/2008; 14(3):248-50.

Publication Stats

1 Citation
19.51 Total Impact Points

Institutions

  • 2013
    • University of North Carolina at Charlotte
      • Department of Electrical & Computer Engineering
      Charlotte, North Carolina, United States
  • 2008
    • Third Military Medical University
      Ch’ung-ch’ing-shih, Chongqing Shi, China