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  • 1
    Online Resource
    Online Resource
    Time-resolved correlative optical microscopy of charge-carrier transport, recombination, and space-charge fields in CdTe heterostructures
    AIP Publishing ; 2017
    In:  Applied Physics Letters Vol. 110, No. 8 ( 2017-02-20)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 110, No. 8 ( 2017-02-20)
    Abstract: From time- and spatially resolved optical measurements, we show that extended defects can have a large effect on the charge-carrier recombination in II–VI semiconductors. In CdTe double heterostructures grown by molecular beam epitaxy on the InSb (100)-orientation substrates, we characterized the extended defects and found that near stacking faults the space-charge field extends by 2–5 μm. Charge carriers drift (with the space-charge field strength of 730–1,360 V cm−1) and diffuse (with the mobility of 260 ± 30 cm2 V−1 s−1) toward the extended defects, where the minority-carrier lifetime is reduced from 560 ns to 0.25 ns. Therefore, the extended defects are nonradiative recombination sinks that affect areas significantly larger than the typical crystalline grains in II–VI solar cells. From the correlative time-resolved photoluminescence and second-harmonic generation microscopy data, we developed a band-diagram model that can be used to analyze the impact of extended defects on solar cells and other electronic devices.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/1.4976696
    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
    Isochronous space–time wave packets
    Optica Publishing Group ; 2021
    In:  Optics Letters Vol. 46, No. 10 ( 2021-05-15), p. 2260-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 46, No. 10 ( 2021-05-15), p. 2260-
    Abstract: The group delay incurred by an optical wave packet depends on its path length. Therefore, when a wave packet is obliquely incident on a planar homogeneous slab, the group delay upon traversing it inevitably increases with the angle of incidence. Here, we confirm the existence of isochronous “space–time” (ST) wave packets: pulsed beams whose spatiotemporal structure enables them to traverse the layer with a fixed group delay over a wide span of incident angles. This unique behavior stems from the dependence of the group velocity of a refracted ST wave packet on its angle of incidence. Isochronous ST wave packets are observed in slabs of optical materials with indices ranging from 1.38 to 2.5 for angles up to 50° away from normal incidence.
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.423227
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    detail.hit.zdb_id: 243290-0
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  • 3
    Online Resource
    Online Resource
    Refraction of space-time wave packets: III. experiments at oblique incidence
    Optica Publishing Group ; 2021
    In:  Journal of the Optical Society of America A Vol. 38, No. 10 ( 2021-10-01), p. 1462-
    Details
    In: Journal of the Optical Society of America A, Optica Publishing Group, Vol. 38, No. 10 ( 2021-10-01), p. 1462-
    Abstract: The refraction of space-time (ST) wave packets at planar interfaces between non-dispersive, homogeneous, isotropic dielectrics exhibits fascinating phenomena, even at normal incidence. Examples of such refractive phenomena include group-velocity invariance across the interface, anomalous refraction, and group-velocity inversion. Crucial differences emerge at oblique incidence with respect to the results established at normal incidence. For example, the group velocity of the refracted ST wave packet can be tuned simply by changing the angle of incidence. In the third paper, we present experimental verification of the refractive phenomena exhibited by ST wave packets at oblique incidence that were in the first paper of this sequence [ J. Opt. Soc. Am. A 38 , 1409 ( 2021 ) 10.1364/JOSAA.430105 ]. We also examine a proposal for “blind synchronization,” whereby identical ST wave packets arrive simultaneously at different receivers without a priori knowledge of their locations except that they are all located at the same depth beyond an interface between two media. A first proof-of-principle experimental demonstration of this effect is provided.
    Type of Medium: Online Resource
    ISSN: 1084-7529 , 1520-8532
    URL: Article
    DOI: 10.1364/JOSAA.430109
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    SSG: 24,1
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  • 4
    Online Resource
    Online Resource
    Superresolved multiphoton microscopy with spatial frequency-modulated imaging
    Proceedings of the National Academy of Sciences ; 2016
    In:  Proceedings of the National Academy of Sciences Vol. 113, No. 24 ( 2016-06-14), p. 6605-6610
    Details
    In: Proceedings of the National Academy of Sciences, Proceedings of the National Academy of Sciences, Vol. 113, No. 24 ( 2016-06-14), p. 6605-6610
    Abstract: Superresolved far-field microscopy has emerged as a powerful tool for investigating the structure of objects with resolution well below the diffraction limit of light. Nearly all superresolution imaging techniques reported to date rely on real energy states of fluorescent molecules to circumvent the diffraction limit, preventing superresolved imaging with contrast mechanisms that occur via virtual energy states, including harmonic generation (HG). We report a superresolution technique based on spatial frequency-modulated imaging (SPIFI) that permits superresolved nonlinear microscopy with any contrast mechanism and with single-pixel detection. We show multimodal superresolved images with two-photon excited fluorescence (TPEF) and second-harmonic generation (SHG) from biological and inorganic media. Multiphoton SPIFI (MP-SPIFI) provides spatial resolution up to 2η below the diffraction limit, where η is the highest power of the nonlinear intensity response. MP-SPIFI can be used to provide enhanced resolution in optically thin media and may provide a solution for superresolved imaging deep in scattering media.
    Type of Medium: Online Resource
    ISSN: 0027-8424 , 1091-6490
    URL: Article
    DOI: 10.1073/pnas.1602811113
    RVK:
    TA 1000
    RVK:
    WA 15000
    Language: English
    Publisher: Proceedings of the National Academy of Sciences
    Publication Date: 2016
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    SSG: 11
    SSG: 12
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  • 5
    Online Resource
    Online Resource
    Refraction of space-time wave packets: II. experiments at normal incidence
    Optica Publishing Group ; 2021
    In:  Journal of the Optical Society of America A Vol. 38, No. 10 ( 2021-10-01), p. 1450-
    Details
    In: Journal of the Optical Society of America A, Optica Publishing Group, Vol. 38, No. 10 ( 2021-10-01), p. 1450-
    Abstract: The refraction of space-time (ST) wave packets offers many fascinating surprises with respect to conventional pulsed beams. In the first paper in this sequence [ J. Opt. Soc. Am. A 38 , 1409 ( 2021 ) 10.1364/JOSAA.430105 ], we theoretically described the refraction of all families of ST wave packets at normal and oblique incidence at a planar interface between two nondispersive, homogeneous, isotropic dielectrics. Here, in this second paper in the sequence, we present experimental verification of the refractive phenomena predicted for baseband ST wave packets upon normal incidence on a planar interface. Specifically, we observe group velocity invariance, normal and anomalous refraction, and group velocity inversion leading to group delay cancellation. These phenomena are verified in a set of optical materials with refractive indices ranging from 1.38 to 1.76, including M g F 2 , fused silica, BK7 glass, and sapphire. We also provide a geometrical representation of the physics associated with anomalous refraction in terms of the dynamics of the spectral support domain for ST wave packets on the surface of the light cone.
    Type of Medium: Online Resource
    ISSN: 1084-7529 , 1520-8532
    URL: Article
    DOI: 10.1364/JOSAA.430108
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2021
    SSG: 24,1
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  • 6
    Online Resource
    Online Resource
    Spectral phase and amplitude retrieval and compensation technique for measurement of pulses
    Optica Publishing Group ; 2019
    In:  Optics Letters Vol. 44, No. 8 ( 2019-04-15), p. 2085-
    Details
    In: Optics Letters, Optica Publishing Group, Vol. 44, No. 8 ( 2019-04-15), p. 2085-
    Type of Medium: Online Resource
    ISSN: 0146-9592 , 1539-4794
    URL: Article
    DOI: 10.1364/OL.44.002085
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2019
    detail.hit.zdb_id: 243290-0
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  • 7
    Online Resource
    Online Resource
    Two dimensional numerical simulations of carrier dynamics during time-resolved photoluminescence decays in two-photon microscopy measurements in semiconductors
    AIP Publishing ; 2015
    In:  Journal of Applied Physics Vol. 118, No. 4 ( 2015-07-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 118, No. 4 ( 2015-07-28)
    Abstract: We use two-dimensional numerical simulations to analyze high spatial resolution time-resolved spectroscopy data. This analysis is applied to two-photon excitation time-resolved photoluminescence (2PE-TRPL) but is broadly applicable to all microscopic time-resolved techniques. By solving time-dependent drift-diffusion equations, we gain insight into carrier dynamics and transport characteristics. Accurate understanding of measurement results establishes the limits and potential of the measurement and enhances its value as a characterization method. Diffusion of carriers outside of the collection volume can have a significant impact on the measured decay but can also provide an estimate of carrier mobility as well as lifetime. In addition to material parameters, the experimental conditions, such as spot size and injection level, can impact the measurement results. Although small spot size provides better resolution, it also increases the impact of diffusion on the decay; if the spot size is much smaller than the diffusion length, it impacts the entire decay. By reproducing experimental 2PE-TRPL decays, the simulations determine the bulk carrier lifetime from the data. The analysis is applied to single-crystal and heteroepitaxial CdTe, material important for solar cells, but it is also applicable to other semiconductors where carrier diffusion from the excitation volume could affect experimental measurements.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/1.4927299
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2015
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    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 8
    Online Resource
    Online Resource
    Axial Spectral Encoding of Space-Time Wave Packets
    American Physical Society (APS) ; 2021
    In:  Physical Review Applied Vol. 15, No. 2 ( 2021-2-26)
    Details
    In: Physical Review Applied, American Physical Society (APS), Vol. 15, No. 2 ( 2021-2-26)
    Type of Medium: Online Resource
    ISSN: 2331-7019
    URL: Article
    DOI: 10.1103/PhysRevApplied.15.024067
    Language: English
    Publisher: American Physical Society (APS)
    Publication Date: 2021
    detail.hit.zdb_id: 2760310-6
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  • 9
    Online Resource
    Online Resource
    Two-dimensional random access multiphoton spatial frequency modulated imaging
    Optica Publishing Group ; 2020
    In:  Optics Express Vol. 28, No. 1 ( 2020-01-06), p. 405-
    Details
    In: Optics Express, Optica Publishing Group, Vol. 28, No. 1 ( 2020-01-06), p. 405-
    Abstract: Spatial frequency modulated imaging (SPIFI) enables the use of an extended excitation source for linear and nonlinear imaging with single element detection. To date, SPIFI has only been used with fixed excitation source geometries. Here, we explore the potential for the SPIFI method when a spatial light modulator (SLM) is used to program the excitation source, opening the door to a more versatile, random access imaging environment. In addition, an in-line, quantitative pulse compensation and measurement scheme is demonstrated using a new technique, spectral phase and amplitude retrieval and compensation (SPARC). This enables full characterization of the light exposure conditions at the focal plane of the random access imaging system, an important metric for optimizing, and reporting imaging conditions within specimens.
    Type of Medium: Online Resource
    ISSN: 1094-4087
    URL: Article
    DOI: 10.1364/OE.378460
    Language: English
    Publisher: Optica Publishing Group
    Publication Date: 2020
    detail.hit.zdb_id: 1491859-6
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