GLORIA

GEOMAR Library Ocean Research Information Access

X

Your email was sent successfully. Check your inbox.

An error occurred while sending the email. Please try again.

Proceed reservation?

Export
Filter
  • AIP Publishing  (31)
  • 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
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 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
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 3
    Online Resource
    Online Resource
    Design and characterization of surface molecular assemblies for the preparation of solar fuels
    AIP Publishing ; 2022
    In:  Chemical Physics Reviews Vol. 3, No. 1 ( 2022-03-01)
    Details
    In: Chemical Physics Reviews, AIP Publishing, Vol. 3, No. 1 ( 2022-03-01)
    Abstract: A key issue in solar energy conversion is the utilization of solar energy for the preparation of solar fuels. In this area, artificial photosynthesis offers promising approaches for the conversion of H2O and CO2 into usable solar fuels. This review highlights both the design and characterization of surface molecular assemblies for the preparation of solar fuels. It includes mechanistic summaries of the details of the underlying surface chemical reactions including water oxidation and proton/water reduction. The surface mechanisms are shown to integrate molecular reactivity with surface electron transfer in integrated assemblies that lead to impressive efficiencies for water oxidation and proton or CO2 reduction.
    Type of Medium: Online Resource
    ISSN: 2688-4070
    URL: Article
    DOI: 10.1063/5.0072430
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 4
    Online Resource
    Online Resource
    Guest Editorial: Special Topic on Coherent Raman Spectroscopy and Imaging
    AIP Publishing ; 2018
    In:  APL Photonics Vol. 3, No. 9 ( 2018-09-01)
    Details
    In: APL Photonics, AIP Publishing, Vol. 3, No. 9 ( 2018-09-01)
    Type of Medium: Online Resource
    ISSN: 2378-0967
    URL: Article
    DOI: 10.1063/1.5052267
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2018
    detail.hit.zdb_id: 2857268-3
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 5
    Online Resource
    Online Resource
    Status of research on non-conventional technology assisted single-point diamond turning
    AIP Publishing ; 2023
    In:  Nanotechnology and Precision Engineering Vol. 6, No. 3 ( 2023-09-01)
    Details
    In: Nanotechnology and Precision Engineering, AIP Publishing, Vol. 6, No. 3 ( 2023-09-01)
    Abstract: With the increasing use of difficult-to-machine materials in aerospace applications, machining requirements are becoming ever more rigorous. However, traditional single-point diamond turning (SPDT) can cause surface damage and tool wear. Thus, it is difficult for SPDT to meet the processing requirements, and it has significant limitations. Research indicates that supplementing SPDT with unconventional techniques can, importantly, solve problems due to the high cutting forces and poor surface quality for difficult-to-machine materials. This paper first introduces SPDT and reviews research into unconventional techniques for use with SPDT. The machining mechanism is discussed, and the main advantages and disadvantages of various methods are investigated. Second, hybrid SPDT is briefly described, which encompasses ultrasonic-vibration magnetic-field SPDT, ultrasonic-vibration laser SPDT, and ultrasonic-vibration cold-plasma SPDT. Compared with the traditional SPDT method, hybrid SPDT produces a better optical surface quality. The current status of research into unconventional techniques to supplement SPDT is then summarized. Finally, future development trends and the application prospects of unconventional assisted SPDT are discussed.
    Type of Medium: Online Resource
    ISSN: 1672-6030 , 2589-5540
    URL: Article
    DOI: 10.1063/10.0019549
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 2983270-6
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 6
    Online Resource
    Online Resource
    Application of the sparse-Lagrangian multiple mapping conditioning approach to a model supersonic combustor
    AIP Publishing ; 2020
    In:  Physics of Fluids Vol. 32, No. 10 ( 2020-10-01)
    Details
    In: Physics of Fluids, AIP Publishing, Vol. 32, No. 10 ( 2020-10-01)
    Abstract: The Multiple Mapping Conditioning/Large Eddy Simulation (MMC-LES) model is extended for the first time to high-speed, compressible flow conditions and validated against non-reacting and reacting experimental data from a model supersonic combustor. The MMC-LES method solves the subgrid joint composition filtered density function through a Monte Carlo approach, and it permits a low-cost numerical implementation using a sparse distribution of stochastic Lagrangian particles. The sensitivity of results to the particle resolution is examined, and similar to past low-speed applications of MMC-LES, that sensitivity is found to be low. In comparison to the model equations for subsonic turbulent combustion conditions, the pressure work and viscous heating effects have been incorporated here to account for the effects of compressibility. As expected, the viscous heating effects are small for this flow case and can be ignored, while the pressure work is not negligible and makes a significant contribution at expansion fans and shock fronts where the magnitude of the pressure derivative term in non-reacting/reacting cases is as much as 23.8%/24.5% and 19.2%/18.6% of the stochastic particle standardized enthalpy, respectively. The MMC-LES predictions show good quantitative agreement with the available experimental data for the mean and root-mean-square of axial velocity, mean temperature, and wall pressure. Good qualitative comparison to the data is also observed for major flow characteristics, including location and size of shocks, expansion fans, and recirculation zone, and combustion characteristics such as flame lift-off distance. Although the effects of the pressure work on the mean flame lift-off distance are negligible, they have a significant influence on the predicted spatial fluctuations of the flame base.
    Type of Medium: Online Resource
    ISSN: 1070-6631 , 1089-7666
    URL: Article
    DOI: 10.1063/5.0026654
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2020
    detail.hit.zdb_id: 1472743-2
    detail.hit.zdb_id: 241528-8
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 7
    Online Resource
    Online Resource
    Robust high-bandwidth control of nano-positioning stages with Kalman filter based extended state observer and H ∞ control
    AIP Publishing ; 2021
    In:  Review of Scientific Instruments Vol. 92, No. 6 ( 2021-06-01)
    Details
    In: Review of Scientific Instruments, AIP Publishing, Vol. 92, No. 6 ( 2021-06-01)
    Abstract: The achievable performance of the piezo-actuated nano-positioning stages is severely limited by the intrinsic nonlinearities of the actuators, the lightly damped resonant mode of the flexure-hinge mechanism, and the external disturbances. To overcome all these limitations, this paper presents a novel robust dual-loop control scheme with a Kalman filter-based extended state observer and H∞ control for nano-positioning stages to implement high-bandwidth tracking operations. In this scheme, the extended state observer (ESO) is first developed and assisted by the identified system model to estimate both the system states and total disturbances, where the estimated disturbance is compensated by the direct feedback. In particular, to further improve the estimation performance, the Kalman filter is thus incorporated into the ESO to optimize the observer gain. Then, the state-feedback-based inner-loop controller is designed via the pole-placement method to damp the resonant mode of nano-positioning stages. Finally, a H∞ robust controller is adopted in the outer-loop to eliminate the influence resulting from the external disturbances, nonlinearities, and unmodeled dynamics on tracking operations. To validate the effectiveness of the proposed approach, comparative experiments are conducted on a piezo-actuated nano-positioning stage. Experimental results demonstrate that the proposed control scheme improves the control bandwidth of the system from 3.6 kHz (the stand-alone H∞ controller) to 5.52 kHz, which is 93.5% of the first resonant frequency of the original system. Moreover, it shows excellent robustness against the variation of system dynamics due to the change in the mounted mass and the external disturbances.
    Type of Medium: Online Resource
    ISSN: 0034-6748 , 1089-7623
    URL: Article
    DOI: 10.1063/5.0048870
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 209865-9
    detail.hit.zdb_id: 1472905-2
    SSG: 11
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 8
    Online Resource
    Online Resource
    Label-free three-dimensional imaging of cell nucleus using third-harmonic generation microscopy
    AIP Publishing ; 2014
    In:  Applied Physics Letters Vol. 105, No. 10 ( 2014-09-08)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 105, No. 10 ( 2014-09-08)
    Abstract: We report the implementation of the combined third-harmonic generation (THG) and two-photon excited fluorescence (TPEF) microscopy for label-free three-dimensional (3-D) imaging of cell nucleus morphological changes in liver tissue. THG imaging shows regular spherical shapes of normal hepatocytes nuclei with inner chromatin structures while revealing the condensation of chromatins and nuclear fragmentations in hepatocytes of diseased liver tissue. Colocalized THG and TPEF imaging provides complementary information of cell nuclei and cytoplasm in tissue. This work suggests that 3-D THG microscopy has the potential for quantitative analysis of nuclear morphology in cells at a submicron-resolution without the need for DNA staining.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    URL: Article
    URL: Article
    DOI: 10.1063/1.4895577
    DOI: 10.1063/1.4895577.1
    DOI: 10.1063/1.4895577.2
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2014
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 9
    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
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
  • 10
    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
    Location Call Number Limitation Availability
    BibTip Others were also interested in ...
    Online Resource
Close ⊗
This website uses cookies and the analysis tool Matomo. More information can be found here...