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  • AIP Publishing  (14)
  • Physics  (14)
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  • AIP Publishing  (14)
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  • Physics  (14)
RVK
  • 1
    Online Resource
    Online Resource
    Optical gain from vertical Ge-on-Si resonant-cavity light emitting diodes with dual active regions
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 11 ( 2017-09-11)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 11 ( 2017-09-11)
    Abstract: Vertical resonant-cavity light emitting diodes with dual active regions consisting of highly n-doped Ge/GeSi multiple quantum wells (MQWs) and a Ge epilayer are proposed to improve the light emitting efficiency. The MQWs are designed to optically pump the underlying Ge epilayer under electric injection. Abundant excess carriers can be optically pumped into the Γ valley of the Ge epilayer apart from electric pumping. With the combination of a vertical cavity, the efficiency of the optical-pumping process was effectively improved due to the elongation of the optical length in the cavity. With the unique feature, optical gain from the Ge epilayer is observed between 1625 and 1700 nm at injection current densities of & gt;1.528 kA/cm2. The demonstration of optical gain from the Ge epilayer indicates that this strategy can be generally useful for Si-based light sources with indirect band materials.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4993652
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 2
    Online Resource
    Online Resource
    Strong electroluminescence from direct band and defects in Ge n+/p shallow junctions at room temperature
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 108, No. 19 ( 2016-05-09)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 108, No. 19 ( 2016-05-09)
    Abstract: Strong room temperature electroluminescence with two emission peaks at around 0.786 eV and 0.747 eV from Ge n+/p shallow junctions was reported. The peak at around 0.786 eV comes from direct band luminescence (DBL) in n + Ge regions, while the peak fixing at 0.747 eV is resulted from defects induced by ion implantation. Heavy n-type doping in Ge renders realization of strong defect-related luminescence (DRL) feasible. The peak intensity ratio of DRL/DBL decreases with increase of injection current since more electrons are filled in Γ valley. Above all, the Ge n+/p shallow junction is fully compatible with the source and drain in Ge metal-oxide-semiconductor field effect transistors.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4949532
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 3
    Online Resource
    Online Resource
    Annular aperture-detected coherent anti-Stokes Raman scattering microscopy for high contrast vibrational imaging
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 97, No. 8 ( 2010-08-23)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 97, No. 8 ( 2010-08-23)
    Abstract: We report on a unique annular aperture detection scheme for effective suppression of nonresonant background in coherent anti-Stokes Raman scattering (CARS) microscopy imaging. The results show that the resonant CARS signal to nonresonant background ratio (SBR) varies with both the scatterers’ sizes and the annular aperture diameters used, and an approximately 20-fold improvement in SBR can be obtained when an annular aperture size of 0.9 (related to the objective diameter) is selected for imaging the scatterers with diameters close to the excitation wavelength. We demonstrate this technique by imaging 300 to 1100 nm polystyrene beads and human epithelial cells in aqueous environments.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3483772
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 4
    Online Resource
    Online Resource
    Polarization-resolved second-harmonic generation imaging for liver fibrosis assessment without labeling
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 103, No. 17 ( 2013-10-21)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 103, No. 17 ( 2013-10-21)
    Abstract: We apply the polarization-resolved second-harmonic generation (PR-SHG) microscopy to investigate the changes of collagen typings (type I vs type III) and collagen fibril orientations of liver tissue in bile-duct-ligation (BDL) rat models. The PR-SHG results show that the second-order susceptibility tensor ratios (χ31/χ15 and χ33/χ15) of collagen fibers increase with liver fibrotic progression after BDL surgery, reflecting an increase of the type III collagen component with the severity of liver fibrosis; and the square root of the collagen type III to type I ratio linearly correlates (R2 = 0.98) with histopathological scores. Furthermore, the collagen fibril orientations become more random with liver fibrosis transformation as compared to normal liver tissue. This work demonstrates that PR-SHG microscopy has the potential for label-free diagnosis and characterization of liver fibrosis based on quantitative analysis of collagen typings and fibril orientations.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4826516
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Integrated coherent anti-Stokes Raman scattering and multiphoton microscopy for biomolecular imaging using spectral filtering of a femtosecond laser
    AIP Publishing ; 2010
    In:  Applied Physics Letters Vol. 96, No. 13 ( 2010-03-29)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 96, No. 13 ( 2010-03-29)
    Abstract: We report on a unique implementation of a dual 4-f paired-gratings spectral filtering of a femtosecond (fs) laser to realize high contrast coherent anti-Stokes Raman scattering (CARS) microscopy and high quality multiphoton microscopy on the same platform for label-free biomolecular imaging. The 4-f gratings filtering enables readily conversion of the 100 fs laser pulse trains into transform-limited 1 picosecond (ps) pulses in the spectral range of 700–1600 nm for CARS imaging. Compared with fs-CARS microscopy, our ps-CARS imaging yields an approximately tenfold improvement in spectral resolution, while a twofold improvement in nonresonant background suppression. High quality second-harmonic generation and two-photon excitation fluorescence imaging can also be acquired in tandem when swapping the 4-f grating filtering from the ps mode to fs mode. We demonstrate this multimodal nonlinear optical microscopy technique by imaging 465 nm polystyrene beads in water and animal liver tissue.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.3377905
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2010
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 6
    Online Resource
    Online Resource
    Radially polarized tip-enhanced near-field coherent anti-Stokes Raman scattering microscopy for vibrational nano-imaging
    AIP Publishing ; 2013
    In:  Applied Physics Letters Vol. 103, No. 8 ( 2013-08-19)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 103, No. 8 ( 2013-08-19)
    Abstract: We report a radially polarized tip-enhanced near-field coherent anti-Stokes Raman scattering (RP-TE-CARS) microscopy technique for high-contrast vibrational imaging of subcellular organelles at nano-scale resolutions. The radially polarized pump and Stokes laser beams are tightly focused onto the sample while a gold-coated metallic probe is placed at the upper surface of the sample to enhance the electric field and CARS signals. The back-scattered CARS signal is measured with the gold-coated nano-tip being stationary at the focal region of laser beams. The RP-TE-CARS signal is ∼6-fold higher than that using linearly polarized laser excitation. We demonstrate the good performance of the RP-TE-CARS technique developed by imaging sub-micron polystyrene beads and mitochondria at nano-scale resolutions.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4819236
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2013
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 7
    Online Resource
    Online Resource
    Quantitative assessment of spinal cord injury using circularly polarized coherent anti-Stokes Raman scattering microscopy
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 111, No. 6 ( 2017-08-07)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 111, No. 6 ( 2017-08-07)
    Abstract: We report the quantitative assessment of spinal cord injury using the circularly polarized coherent anti-Stokes Raman scattering (CP-CARS) technique together with Stokes parameters in the Poincaré sphere. The pump and Stokes excitation beams are circularly polarized to suppress both the linear polarization-dependent artifacts and the nonresonant background of tissue CARS imaging, enabling quantitative CP-CARS image analysis. This study shows that CP-CARS imaging uncovers significantly increased phase retardance of injured spinal cord tissue as compared to normal tissue, suggesting that CP-CARS is an appealing label-free imaging tool for determining the degree of tissue phase retardance, which could serve as a unique diagnostic parameter associated with nervous tissue injury.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.1063/1.4991792
    DOI: 10.1063/1.4991792.1
    DOI: 10.1063/1.4991792.2
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2017
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 8
    Online Resource
    Online Resource
    A high-strength Co–Fe–Ta–B metallic-glass phase enabled tensile plasticity in Co–Fe–Ta–B–O oxide glass matrix nanocomposites
    AIP Publishing ; 2020
    In:  Applied Physics Letters Vol. 116, No. 8 ( 2020-02-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 116, No. 8 ( 2020-02-24)
    Abstract: Oxide glasses are intrinsically brittle at room temperature when loaded under tension. In this study, a high-strength CoFe-based metallic glass was used as a strengthening phase to make a Co–Fe–Ta–B–O oxide glass become stronger and ductile in tension. The developed metallic-glass-reinforced oxide glass matrix nanocomposite possessed a supra-nanometer-sized dual-phase structure. Owing to the dispersion strengthening effects, the nanocomposite showed a tensile strength σb of ∼2.7 GPa, about 29% higher than that of the single-phase oxide glass. Meanwhile, its tensile plasticity εp was enhanced from zero to ∼2.7%. The continuous glass/glass interfaces of the dual-phase mixture are thought to enable the tensile plasticity in the nanocomposite. Our results provide an approach to effectively enhance both the strength and tensile ductility of intrinsically brittle oxide glasses.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.5143598
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 9
    Online Resource
    Online Resource
    Ultra-sensitive graphene photodetector with plasmonic structure
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 109, No. 17 ( 2016-10-24)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 109, No. 17 ( 2016-10-24)
    Abstract: We report a graphene-based photodetector with ultra-high photoresponsivity and wavelength selectivity, targeting at the mid-infrared (MIR) regime. To enhance the spectral selectivity, a gold-grating structure is designed and implemented under the graphene layer to excite surface plasmon polaritons (SPPs). The electromagnetic field with specific wavelength can be guided to and confined within the designed subwavelength structures. The graphene layer contacted by metal is slightly p-type doped due to gold grating, improving the interband transition rate of electrons. The built-in potential established in the contact region facilitates the separation of non-equilibrium carriers generated on graphene layer, leading to a photovoltage. With optimized structural design the photodetector exhibits excellent photoresponsivity of 1 V/μW at the wavelength of 9 μm.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4966597
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 10
    Online Resource
    Online Resource
    Polarization-resolved hyperspectral stimulated Raman scattering microscopy for label-free biomolecular imaging of the tooth
    AIP Publishing ; 2016
    In:  Applied Physics Letters Vol. 108, No. 3 ( 2016-01-18)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 108, No. 3 ( 2016-01-18)
    Abstract: We report the development and implementation of a rapid polarization-resolved hyperspectral stimulated Raman scattering (SRS) microscopy technique for label-free biomolecular imaging of the tooth. The hyperspectral SRS imaging technique developed covers both fingerprint (800–1800 cm−1) and high-wavenumber (2800–3600 cm−1) regions for tooth Raman imaging without fluorescence background interference with an imaging speed of & lt;0.3 s per frame of 512 × 512 pixels (∼1 μs per pixel), that is, & gt;106 faster than confocal Raman imaging. Significant differences of hyperspectral SRS spectra among different tooth locations (e.g., dentin, enamel, and dentin-enamel junction) are observed, revealing the biochemical distribution differences across the tooth. Further polarization-resolved SRS imaging shows different polarization dependences related to the molecular orientation differences of various tooth locations. This work demonstrates the potential of polarization-resolved hyperspectral SRS imaging technique developed in rapidly characterizing biochemical structures and compositions as well as biomolecule organizations/orientations of the tooth without labeling.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    URL: Article
    DOI: 10.1063/1.4939923
    DOI: 10.1063/1.4939923.1
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2016
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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