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  1. Article ; Online: Unzipping hBN with ultrashort mid-infrared pulses.

    Chen, Cecilia Y / Moore, Samuel L / Maiti, Rishi / Ginsberg, Jared S / Jadidi, M Mehdi / Li, Baichang / Chae, Sang Hoon / Rajendran, Anjaly / Patwardhan, Gauri N / Watanabe, Kenji / Taniguchi, Takashi / Hone, James / Basov, D N / Gaeta, Alexander L

    Science advances

    2024  Volume 10, Issue 18, Page(s) eadi3653

    Abstract: Manipulating the nanostructure of materials is critical for numerous applications in electronics, magnetics, and photonics. However, conventional methods such as lithography and laser writing require cleanroom facilities or leave residue. We describe an ... ...

    Abstract Manipulating the nanostructure of materials is critical for numerous applications in electronics, magnetics, and photonics. However, conventional methods such as lithography and laser writing require cleanroom facilities or leave residue. We describe an approach to creating atomically sharp line defects in hexagonal boron nitride (hBN) at room temperature by direct optical phonon excitation with a mid-infrared pulsed laser from free space. We term this phenomenon "unzipping" to describe the rapid formation and growth of a crack tens of nanometers wide from a point within the laser-driven region. Formation of these features is attributed to the large atomic displacement and high local bond strain produced by strongly driving the crystal at a natural resonance. This process occurs only via coherent phonon excitation and is highly sensitive to the relative orientation of the crystal axes and the laser polarization. Its cleanliness, directionality, and sharpness enable applications such as polariton cavities, phonon-wave coupling, and in situ flake cleaving.
    Language English
    Publishing date 2024-05-01
    Publishing country United States
    Document type Journal Article
    ZDB-ID 2810933-8
    ISSN 2375-2548 ; 2375-2548
    ISSN (online) 2375-2548
    ISSN 2375-2548
    DOI 10.1126/sciadv.adi3653
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  2. Article ; Online: Nonlinear refractive index of solids in mid-infrared.

    Patwardhan, Gauri N / Ginsberg, Jared S / Chen, Cecilia Y / Jadidi, M Mehdi / Gaeta, Alexander L

    Optics letters

    2021  Volume 46, Issue 8, Page(s) 1824–1827

    Abstract: We measure the third-order nonlinear optical response of various dielectrics and semiconductors using the spectrally resolved two-beam coupling method at 2.3 µm, 3.5 µm, 4.5 µm, and 8.3 µm. These materials include fused silica, sapphire, calcium fluoride, ...

    Abstract We measure the third-order nonlinear optical response of various dielectrics and semiconductors using the spectrally resolved two-beam coupling method at 2.3 µm, 3.5 µm, 4.5 µm, and 8.3 µm. These materials include fused silica, sapphire, calcium fluoride, magnesium fluoride, zinc sulphide, and zinc selenide. We compare our results with previous literature results and theoretically expected values using two-band model theory. The dispersion of the nonlinear refractive index
    Language English
    Publishing date 2021-04-16
    Publishing country United States
    Document type Journal Article
    ISSN 1539-4794
    ISSN (online) 1539-4794
    DOI 10.1364/OL.421469
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  3. Article ; Online: Phonon-enhanced nonlinearities in hexagonal boron nitride.

    Ginsberg, Jared S / Jadidi, M Mehdi / Zhang, Jin / Chen, Cecilia Y / Tancogne-Dejean, Nicolas / Chae, Sang Hoon / Patwardhan, Gauri N / Xian, Lede / Watanabe, Kenji / Taniguchi, Takashi / Hone, James / Rubio, Angel / Gaeta, Alexander L

    Nature communications

    2023  Volume 14, Issue 1, Page(s) 7685

    Abstract: Polar crystals can be driven into collective oscillations by optical fields tuned to precise resonance frequencies. As the amplitude of the excited phonon modes increases, novel processes scaling non-linearly with the applied fields begin to contribute ... ...

    Abstract Polar crystals can be driven into collective oscillations by optical fields tuned to precise resonance frequencies. As the amplitude of the excited phonon modes increases, novel processes scaling non-linearly with the applied fields begin to contribute to the dynamics of the atomic system. Here we show two such optical nonlinearities that are induced and enhanced by the strong phonon resonance in the van der Waals crystal hexagonal boron nitride (hBN). We predict and observe large sub-picosecond duration signals due to four-wave mixing (FWM) during resonant excitation. The resulting FWM signal allows for time-resolved observation of the crystal motion. In addition, we observe enhancements of third-harmonic generation with resonant pumping at the hBN transverse optical phonon. Phonon-induced nonlinear enhancements are also predicted to yield large increases in high-harmonic efficiencies beyond the third.
    Language English
    Publishing date 2023-11-24
    Publishing country England
    Document type Journal Article
    ZDB-ID 2553671-0
    ISSN 2041-1723 ; 2041-1723
    ISSN (online) 2041-1723
    ISSN 2041-1723
    DOI 10.1038/s41467-023-43501-x
    Database MEDical Literature Analysis and Retrieval System OnLINE

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  4. Article ; Online: Unravelling the room temperature growth of two-dimensional h-BN nanosheets for multifunctional applications.

    Biswas, Abhijit / Maiti, Rishi / Lee, Frank / Chen, Cecilia Y / Li, Tao / Puthirath, Anand B / Iyengar, Sathvik Ajay / Li, Chenxi / Zhang, Xiang / Kannan, Harikishan / Gray, Tia / Saadi, Md Abid Shahriar Rahman / Elkins, Jacob / Birdwell, A Glen / Neupane, Mahesh R / Shah, Pankaj B / Ruzmetov, Dmitry A / Ivanov, Tony G / Vajtai, Robert /
    Zhao, Yuji / Gaeta, Alexander L / Tripathi, Manoj / Dalton, Alan / Ajayan, Pulickel M

    Nanoscale horizons

    2023  Volume 8, Issue 5, Page(s) 641–651

    Abstract: The room temperature growth of two-dimensional van der Waals (2D-vdW) materials is indispensable for state-of-the-art nanotechnology. Low temperature growth supersedes the requirement of elevated growth temperatures accompanied with high thermal budgets. ...

    Abstract The room temperature growth of two-dimensional van der Waals (2D-vdW) materials is indispensable for state-of-the-art nanotechnology. Low temperature growth supersedes the requirement of elevated growth temperatures accompanied with high thermal budgets. Moreover, for electronic applications, low or room temperature growth reduces the possibility of intrinsic film-substrate interfacial thermal diffusion related deterioration of the functional properties and the consequent deterioration of the device performance. Here, we demonstrated the growth of ultrawide-bandgap boron nitride (BN) at room temperature by using the pulsed laser deposition (PLD) process, which exhibited various functional properties for potential applications. Comprehensive chemical, spectroscopic and microscopic characterizations confirmed the growth of ordered nanosheet-like hexagonal BN (h-BN). Functionally, the nanosheets show hydrophobicity, high lubricity (low coefficient of friction), and a low refractive index within the visible to near-infrared wavelength range, and room temperature single-photon quantum emission. Our work unveils an important step that brings a plethora of potential applications for these room temperature grown h-BN nanosheets as the synthesis can be feasible on any given substrate, thus creating a scenario for "
    Language English
    Publishing date 2023-05-02
    Publishing country England
    Document type Journal Article
    ISSN 2055-6764
    ISSN (online) 2055-6764
    DOI 10.1039/d2nh00557c
    Database MEDical Literature Analysis and Retrieval System OnLINE

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    This service is chargeable due to the Delivery terms set by subito. Orders including an article and supplementary material will be classified as separate orders. In these cases, fees will be demanded for each order.

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    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  5. Book ; Online: Unzipping hBN with ultrashort mid-infrared pulses

    Chen, Cecilia Y. / Ginsberg, Jared S. / Moore, Samuel L. / Jadidi, M. Mehdi / Maiti, Rishi / Li, Baichang / Chae, Sang Hoon / Rajendran, Anjaly / Patwardhan, Gauri N. / Watanabe, Kenji / Taniguchi, Takashi / Hone, James / Basov, D. N. / Gaeta, Alexander L.

    2022  

    Abstract: Manipulating the nanostructure of materials is critical for numerous applications in electronics, magnetics, and photonics. However, conventional methods such as lithography and laser-writing require cleanroom facilities or leave residue. Here, we ... ...

    Abstract Manipulating the nanostructure of materials is critical for numerous applications in electronics, magnetics, and photonics. However, conventional methods such as lithography and laser-writing require cleanroom facilities or leave residue. Here, we describe a new approach to create atomically sharp line defects in hexagonal boron nitride (hBN) at room temperature by direct optical phonon excitation in the mid-infrared (mid-IR). We term this phenomenon "unzipping" to describe the rapid formation and growth of a <30-nm-wide crack from a point within the laser-driven region. The formation of these features is attributed to large atomic displacements and high local bond strain from driving the crystal at a natural resonance. This process is distinguished by (i) occurring only under resonant phonon excitation, (ii) producing highly sub-wavelength features, and (iii) sensitivity to crystal orientation and pump laser polarization. Its cleanliness, directionality, and sharpness enable applications in in-situ flake cleaving and phonon-wave-coupling via free space optical excitation.

    Comment: 11 pages, 4 figures
    Keywords Condensed Matter - Materials Science ; Physics - Optics
    Subject code 535
    Publishing date 2022-05-24
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

  6. Book ; Online: Unravelling the room temperature growth of two-dimensional h-BN nanosheets for multifunctional applications

    Biswas, Abhijit / Maiti, Rishi / Lee, Frank / Chen, Cecilia Y. / Li, Tao / Puthirath, Anand B. / Iyengar, Sathvik Ajay / Li, Chenxi / Zhang, Xiang / Kannan, Harikishan / Gray, Tia / Saadi, Md Abid Shahriar Rahman / Elkins, Jacob / Birdwell, A. Glen / Neupane, Mahesh R. / Shah, Pankaj B. / Ruzmetov, Dmitry A. / Ivanov, Tony G. / Vajtai, Robert /
    Zhao, Yuji / Gaeta, Alexander L. / Tripathi, Manoj / Dalton, Alan / Ajayan, Pulickel M.

    2022  

    Abstract: Room temperature growth of two-dimensional van der Waals (2D-vdW) materials is indispensable for state-of-the-art nanotechnology. The low temperature growth supersedes the requirement of elevated growth temperature accompanied with high thermal budgets. ... ...

    Abstract Room temperature growth of two-dimensional van der Waals (2D-vdW) materials is indispensable for state-of-the-art nanotechnology. The low temperature growth supersedes the requirement of elevated growth temperature accompanied with high thermal budgets. Moreover, for electronic applications, low or room temperature growth reduces the possibility of intrinsic film-substrate interfacial thermal diffusion related deterioration of functional properties and consequent device performance. Here, we demonstrated the growth of ultrawide-bandgap boron nitride (BN) at room temperature by using the pulsed laser deposition (PLD) process and demonstrated various functionalities for potential applications. Comprehensive chemical, spectroscopic and microscopic characterization confirms the growth of ordered nanosheet-like hexagonal BN. Functionally, nanosheets show hydrophobicity, high lubricity (low coefficient of friction), low refractive index within the visible to near-infrared wavelength range, and room temperature single-photon quantum emission. Our work unveils an important step that brings a plethora of applications potential for room temperature grown h-BN nanosheets as it can be feasible on any given substrate, thus creating a scenario for h-BN on demand at frugal thermal budget.

    Comment: 27 pages, 4 figures, Authors version of the article
    Keywords Physics - Applied Physics ; Condensed Matter - Materials Science
    Subject code 530
    Publishing date 2022-08-19
    Publishing country us
    Document type Book ; Online
    Database BASE - Bielefeld Academic Search Engine (life sciences selection)

    Full text online

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    Inter-library loan at ZB MED

    Your chosen title can be delivered directly to ZB MED Cologne location if you are registered as a user at ZB MED Cologne.

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