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  • AIP Publishing  (6)
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  • AIP Publishing  (6)
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  • 1
    Online Resource
    Online Resource
    Mid-infrared all-optical wavelength converter based on highly nonlinear MXene-decorated microfiber
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 121, No. 11 ( 2022-09-12)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 121, No. 11 ( 2022-09-12)
    Abstract: We propose an all-optical wavelength converter for the mid-infrared spectral range with enhanced conversion efficiency. A highly nonlinear MXene-decorated microfiber is fabricated by the optical deposition method as the conversion medium, and the fiber exhibits a remarkable nonlinear optical response. We combine the benefits of the two-dimensional MXene materials and tapered microfiber to promote conversion efficiency. Homebuilt holmium-doped fiber lasers emitting at 2.05 μm wavelength are used as pump and signal sources. The experimental conversion efficiency observed by the optical spectrum analyzer is measured at –27.22 dB. This optical device allows an arbitrary tuning range of 17 nm. The fluctuations of the conversion efficiency remain within 1 dB during 2 h. The results of this study may contribute to the realization of optical converter application in the all-optical network at 2 μm wavelength.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0103089
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 2
    Online Resource
    Online Resource
    Gate-tunable molybdenum disulfide/germanium heterostructure with ambipolar infrared photoresponse
    AIP Publishing ; 2022
    In:  Applied Physics Letters Vol. 120, No. 2 ( 2022-01-10)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 120, No. 2 ( 2022-01-10)
    Abstract: This paper proposes a molybdenum disulfide (MoS2)/Germanium (Ge) heterojunction device with a top gate composed of hexagonal boron nitride and graphene. First, the rectification direction of the device is reversed, and the rectification ratio is modulated from 0.09 to 7.3 by varying the gate voltage from −20 to 20 V. Optoelectronic characterization reveals that the device photoresponsivity and speed can improve by several orders of magnitude when graphene is used as the MoS2 contact electrode. There is an ambipolar photoresponse behavior in which the photocurrent polarity can be reversed depending on the wavelength of light and gate voltage applied. A conventional positive responsivity of 13.9 A/W is obtained with a 532 nm visible light. In contrast, the device responsivity changes from 33.7 A/W to −128 mA/W as the gate voltage decreases when a 1550 nm infrared light is used. This ambipolar infrared photocurrent is attributed to the competition between the bolometric effect in MoS2 and photocarrier effect in Ge. In addition, because it has opposite photoresponses at different wavelengths, this device has the potential to be used as a wavelength-distinguishing photodetector. These results offer a strategy for the development of two- and three-dimensional optoelectronic heterostructures.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0077827
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2022
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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    Online Resource
  • 3
    Online Resource
    Online Resource
    Atomic clusters induced rapid hardening behavior in an early stage of isothermal aging for a high-strength Al alloy produced by laser powder bed fusion additive manufacturing
    AIP Publishing ; 2023
    In:  Journal of Applied Physics Vol. 133, No. 2 ( 2023-01-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 133, No. 2 ( 2023-01-14)
    Abstract: Due to the transient interaction between laser and powder and layer-by-layer rapid melting and solidification, laser additive manufacturing-fabricated metal components can exhibit unique microstructure evolution behaviors and strengthening mechanisms that are normally not available in traditional processes. In this work, a previously unreported rapid hardening behavior at the very early stage of isothermal aging for laser powder bed fusion-processed high-strength Al-5024 alloy was revealed. The microstructures and mechanical properties of specimens aged from 10 min to 120h were systematically analyzed. It showed that the specimens underwent two peak hardening processes during an isothermal aging at 325 °C. The mechanical properties of the specimens including microhardness, yield strength, and elastic modulus were significantly enhanced after an extremely short aging time of 10 min and then reached a secondary peak hardening at an aging time of 4h, where the yield strength of 450 ± 10.3 and 463.2 ± 13.2 MPa were obtained, respectively. The unusual aging responses were attributed to the formation and decomposition of Sc-rich clusters with a high number density of 2.7 × 1023 m−3 and nano-size of 2.71 nm. These clusters were characterized by transmission electron microscopy analyses and further supported by differential scanning calorimetry measurements, where a significantly higher activation energy of 147.6 ± 21.1 kJ/mol corresponding to the precipitation/coarsening process of Al3(Sc,Zr) was measured for rapid hardening specimens. In addition, the relationship between the aging process, the evolution of nano-precipitates, and the mechanical properties was systematically demonstrated.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0125303
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2023
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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    Online Resource
  • 4
    Online Resource
    Online Resource
    Focus of ultrasonic underwater sound with 3D printed phononic crystal
    AIP Publishing ; 2021
    In:  Applied Physics Letters Vol. 119, No. 7 ( 2021-08-16)
    Details
    In: Applied Physics Letters, AIP Publishing, Vol. 119, No. 7 ( 2021-08-16)
    Abstract: Ultrasound is widely used in various applications, ranging from ultrasound imaging to particle manipulation. Acoustic materials, such as phononic crystal (PC) and metamaterials, are designed to control the propagation and concentration of ultrasound. While traditional metal-based underwater PCs are usually limited to large 2D structures and used for low-frequency sound wave manipulation, it is difficult to reach the ultrasonic frequency region of the order of 1 MHz with cumbersome metallic structures. Here, in this work, we proposed a 3D printed gradient-index phononic crystal (GRIN PC) lens based on the hyperbolic secant index profile. With a huge impedance difference between air and the 3D printing materials, the GRIN PC lens adhered to the ultrasonic transducers can easily manipulate the propagation of acoustic waves and achieve wave focusing. This transparent and flat lens demonstrates the beam focusing in water even at a high frequency. The integration and miniaturization of transducer and lens make particle capture convenient in relevant medical applications.
    Type of Medium: Online Resource
    ISSN: 0003-6951 , 1077-3118
    URL: Article
    DOI: 10.1063/5.0058415
    RVK:
    UA 1000
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 211245-0
    detail.hit.zdb_id: 1469436-0
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  • 5
    Online Resource
    Online Resource
    Toward accurate electronic, optical, and vibrational properties of hexagonal Si, Ge, and Si1− x Ge x alloys from first-principle simulations
    AIP Publishing ; 2021
    In:  Journal of Applied Physics Vol. 129, No. 14 ( 2021-04-14)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 129, No. 14 ( 2021-04-14)
    Abstract: A new hexagonal phase of Si1−xGex alloys have been successfully synthesized through efforts in recent reports. Utilizing the combined first-principle calculations and special quasi-random model, we precisely investigated the structural, electronic, optical, and vibrational properties of hexagonal Si and Ge and disordered hexagonal Si1−xGex random alloys. We found a large negative deviation between the calculated lattice constants within the revised Perdew–Burke–Ernzerhof for solids functional and the linear fitting results. The electronic structures obtained by using the Tran–Blaha modified Becke–Johnson exchange potential confirm that hexagonal Si1−xGex (x  & gt; 0.625) alloys present direct bandgaps. Through solving the Bethe–Salpeter equation, the linear optical spectra of hexagonal Si and Ge are demonstrated. We reveal that the peaks of complex dielectric functions are redshifted with the addition of Ge atoms. Also, the real and imaginary parts exhibit strong anisotropy, which makes hexagonal Si1−xGex alloys potentially useful as nonlinear crystals. The transition is allowed in the infrared region for the hexagonal Si1−xGex (x  & gt; 0.625) alloys, and the linear optical spectra can be continuously tuned over a wide range of frequency with Ge addition in the infrared region. Furthermore, density-functional perturbation theory calculations were carried out to predict the off-resonance Raman activity. The results suggest that the vibrational modes of the Si–Si bond exhibit a strong dependency on the compositions, which provides a useful way to identify the most probable atomic configurations of hexagonal Si1–xGex alloys in future experiments.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0043773
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
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  • 6
    Online Resource
    Online Resource
    Study of porous structure and gas permeation properties of micro-spalled metal driven by shock loading
    AIP Publishing ; 2021
    In:  Journal of Applied Physics Vol. 130, No. 16 ( 2021-10-28)
    Details
    In: Journal of Applied Physics, AIP Publishing, Vol. 130, No. 16 ( 2021-10-28)
    Abstract: Shock-induced micro-jets and micro-spalls on metal surfaces and the subsequent mixing with surrounding gas are of interest for a wide range of applications, such as inertial-confinement fusion and armor design. This study interprets the mixing of micro-spalled metal with gas as the permeation of gas into the evolving porous structure created by micro-spalled liquid debris. A technical route is established based on the combination of fluid mechanics in porous media and shock dynamics. The topology of the porous metal is studied through molecular dynamic simulation, which captures the major characters of a micro-spalling process driven by shock loading. Pore-network modeling is applied to convert the porous structure of the micro-spalled metal into an assembly of pores and throats. Accordingly, the main porous characteristics of the micro-spalled metal are described by five nondimensional parameters, including porosity, specific area, coordination number, ratio of pore to throat radius, and tortuosity. In addition, the permeability of the micro-spalled metal, characterizing its gas-transport capacity, is also determined by directly simulating a single-phase flow throughout the pore network. The evolution of both porous structure and permeability of the micro-spalled metal subjected to various shock conditions is systematically analyzed. Moreover, the dependence of permeability on porous structure is clarified via a sensitivity analysis, which builds a cross-scale connection between the micro-void morphology and gas permeation at continuum level. The results and conclusions of this study could serve as useful references for both the characterization and design of porous samples in future experimental studies on micro-spalled metal-gas mixing.
    Type of Medium: Online Resource
    ISSN: 0021-8979 , 1089-7550
    URL: Article
    DOI: 10.1063/5.0061717
    Language: English
    Publisher: AIP Publishing
    Publication Date: 2021
    detail.hit.zdb_id: 220641-9
    detail.hit.zdb_id: 3112-4
    detail.hit.zdb_id: 1476463-5
    Location Call Number Limitation Availability
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