The Experts below are selected from a list of 15723 Experts worldwide ranked by ideXlab platform

Igor Aharonovich - One of the best experts on this subject based on the ideXlab platform.

  • low temperature electron phonon interaction of quantum emitters in Hexagonal Boron Nitride
    ACS Photonics, 2020
    Co-Authors: Gabriele Grosso, Milos Toth, Igor Aharonovich, Hyowon Moon, Christopher J Ciccarino, Johannes Flick, Noah Mendelson, Lukas Mennel, Prineha Narang, Dirk Englund
    Abstract:

    Single photon sources based on atomic defects in layered Hexagonal Boron Nitride (hBN) have emerged as promising solid state quantum emitters with atom-like photophysical and quantum optoelectronic...

  • Hexagonal Boron Nitride Cavity Optomechanics
    2019
    Co-Authors: Prasoon K. Shandilya, Milos Toth, Igor Aharonovich, Johannes E. Fröch, Matthew Mitchell, David P. Lake, Sejeong Kim, Bishnupada Behera, Chris Healey, Paul E. Barclay
    Abstract:

    Hexagonal Boron Nitride (hBN) is an emerging layered material that plays a key role in a variety of two-dimensional devices, and has potential applications in nanophotonics and nanomechanics. Here, we demonstrate the first cavity optomechanical system incorporating hBN. Nanomechanical resonators consisting of hBN beams with average dimensions of 12 μm × 1.2 μm × 28 nm and minimum predicted thickness of 8 nm were fabricated using electron beam induced etching and positioned in the optical near-field of silicon microdisk cavities. Of the multiple devices studied here a maximum 0.16 pm/Hz sensitivity to the hBN nanobeam motion is demonstrated, allowing observation of thermally driven mechanical resonances with frequencies between 1 and 23 MHz, and largest mechanical quality factor of 1100 for a 23 MHz mode, at room temperature in high vacuum. In addition, the role of air damping is studied via pressure dependent measurements. Our results constitute an important step toward realizing integrated optomechanical circuits employing hBN

  • photonic crystal cavities from Hexagonal Boron Nitride
    Nature Communications, 2018
    Co-Authors: Sejeong Kim, Milos Toth, Je Fröch, Kenji Watanabe, Takashi Taniguchi, Joe Christian, Marcus Straw, James W Bishop, Daniel Totonjian, Igor Aharonovich
    Abstract:

    Development of scalable quantum photonic technologies requires on-chip integration of photonic components. Recently, Hexagonal Boron Nitride (hBN) has emerged as a promising platform, following reports of hyperbolic phonon-polaritons and optically stable, ultra-bright quantum emitters. However, exploitation of hBN in scalable, on-chip nanophotonic circuits and cavity quantum electrodynamics (QED) experiments requires robust techniques for the fabrication of high-quality optical resonators. In this letter, we design and engineer suspended photonic crystal cavities from hBN and demonstrate quality (Q) factors in excess of 2000. Subsequently, we show deterministic, iterative tuning of individual cavities by direct-write EBIE without significant degradation of the Q-factor. The demonstration of tunable cavities made from hBN is an unprecedented advance in nanophotonics based on van der Waals materials. Our results and hBN processing methods open up promising avenues for solid-state systems with applications in integrated quantum photonics, polaritonics and cavity QED experiments.

  • quantum emission from Hexagonal Boron Nitride monolayers
    Conference on Lasers and Electro-Optics, 2016
    Co-Authors: Toan Trong Tran, Michael J. Ford, Kerem Bray, Milos Toth, Igor Aharonovich
    Abstract:

    We demonstrate first room temperature, and ultrabright single photon emission from a color center in two-dimensional multilayer Hexagonal Boron Nitride. Density Functional Theory calculations indicate that vacancy-related centers are a likely source of the emission.

  • Quantum emission from Hexagonal Boron Nitride monolayers
    Nature Nanotechnology, 2016
    Co-Authors: Toan Trong Tran, Michael J. Ford, Kerem Bray, Milos Toth, Igor Aharonovich
    Abstract:

    Atomically thin van der Waals crystals have recently enabled new scientific and technological breakthroughs across a variety of disciplines in materials science, nanophotonics and physics. However, non-classical photon emission from these materials has not been achieved to date. Here we report room temperature quantum emission from Hexagonal Boron Nitride nanoflakes. The single photon emitter exhibits a combination of superb quantum optical properties at room temperature that include the highest brightness reported in the visible part of the spectrum, narrow line width, absolute photo-stability, a short excited state lifetime and a high quantum efficiency. Density functional theory modeling suggests that the emitter is the antisite nitrogen vacancy defect that is present in single and multi-layer Hexagonal Boron Nitride. Our results constitute the unprecedented potential of van der Waals crystals for nanophotonics, optoelectronics and quantum information processing.

Kenji Watanabe - One of the best experts on this subject based on the ideXlab platform.

  • Hexagonal Boron Nitride as an ideal substrate forcarbon nanotube photonics
    ACS Photonics, 2020
    Co-Authors: Nan Fang, Kenji Watanabe, Takashi Taniguchi, Keigo Otsuka, Akihiro Ishii, Kosuke Nagashio, Y K Kato
    Abstract:

    Hexagonal Boron Nitride is widely used as a substrate for two-dimensional materials in both electronic and photonic devices. Here, we demonstrate that two-dimensional Hexagonal Boron Nitride is als...

  • photonic crystal cavities from Hexagonal Boron Nitride
    Nature Communications, 2018
    Co-Authors: Sejeong Kim, Milos Toth, Je Fröch, Kenji Watanabe, Takashi Taniguchi, Joe Christian, Marcus Straw, James W Bishop, Daniel Totonjian, Igor Aharonovich
    Abstract:

    Development of scalable quantum photonic technologies requires on-chip integration of photonic components. Recently, Hexagonal Boron Nitride (hBN) has emerged as a promising platform, following reports of hyperbolic phonon-polaritons and optically stable, ultra-bright quantum emitters. However, exploitation of hBN in scalable, on-chip nanophotonic circuits and cavity quantum electrodynamics (QED) experiments requires robust techniques for the fabrication of high-quality optical resonators. In this letter, we design and engineer suspended photonic crystal cavities from hBN and demonstrate quality (Q) factors in excess of 2000. Subsequently, we show deterministic, iterative tuning of individual cavities by direct-write EBIE without significant degradation of the Q-factor. The demonstration of tunable cavities made from hBN is an unprecedented advance in nanophotonics based on van der Waals materials. Our results and hBN processing methods open up promising avenues for solid-state systems with applications in integrated quantum photonics, polaritonics and cavity QED experiments.

  • characterization and manipulation of individual defects in insulating Hexagonal Boron Nitride using scanning tunnelling microscopy
    Nature Nanotechnology, 2015
    Co-Authors: Dillon Wong, Kenji Watanabe, Takashi Taniguchi, Jairo Velasco, Juwon Lee, Salman Kahn, Hsinzon Tsai, A Zettl
    Abstract:

    The scanning tunnelling microscope can be used to image and manipulate individual defects in bulk insulating Hexagonal Boron Nitride by capping the material with a monolayer of graphene.

  • carbon nanotube quantum dots on Hexagonal Boron Nitride
    Applied Physics Letters, 2014
    Co-Authors: A Baumgartner, Kenji Watanabe, Takashi Taniguchi, Gulibusitan Abulizi, Jorg Gramich, Christian Schonenberger
    Abstract:

    We report the fabrication details and low-temperature characteristics of carbon nanotube (CNT) quantum dots on flakes of Hexagonal Boron Nitride (hBN) as substrate. We demonstrate that CNTs can be grown on hBN by standard chemical vapor deposition and that standard scanning electron microscopy imaging and lithography can be employed to fabricate nanoelectronic structures when using optimized parameters. This proof of concept paves the way to more complex devices on hBN, with more predictable and reproducible characteristics and electronic stability.

  • carbon nanotube quantum dots on Hexagonal Boron Nitride
    arXiv: Mesoscale and Nanoscale Physics, 2014
    Co-Authors: A Baumgartner, Kenji Watanabe, Takashi Taniguchi, Gulibusitan Abulizi, Jorg Gramich, C Schoenenberger
    Abstract:

    We report the fabrication details and low-temperature characteristics of the first carbon nanotube (CNT) quantum dots on flakes of Hexagonal Boron Nitride (hBN) as substrate. We demonstrate that CNTs can be grown on hBN by standard chemical vapor deposition and that standard scanning electron microscopy imaging and lithography can be employed to fabricate nanoelectronic structures when using optimized parameters. This proof of concept paves the way to more complex devices on hBN, with more predictable and reproducible characteristics and electronic stability.

Takashi Taniguchi - One of the best experts on this subject based on the ideXlab platform.

  • Hexagonal Boron Nitride as an ideal substrate forcarbon nanotube photonics
    ACS Photonics, 2020
    Co-Authors: Nan Fang, Kenji Watanabe, Takashi Taniguchi, Keigo Otsuka, Akihiro Ishii, Kosuke Nagashio, Y K Kato
    Abstract:

    Hexagonal Boron Nitride is widely used as a substrate for two-dimensional materials in both electronic and photonic devices. Here, we demonstrate that two-dimensional Hexagonal Boron Nitride is als...

  • photonic crystal cavities from Hexagonal Boron Nitride
    Nature Communications, 2018
    Co-Authors: Sejeong Kim, Milos Toth, Je Fröch, Kenji Watanabe, Takashi Taniguchi, Joe Christian, Marcus Straw, James W Bishop, Daniel Totonjian, Igor Aharonovich
    Abstract:

    Development of scalable quantum photonic technologies requires on-chip integration of photonic components. Recently, Hexagonal Boron Nitride (hBN) has emerged as a promising platform, following reports of hyperbolic phonon-polaritons and optically stable, ultra-bright quantum emitters. However, exploitation of hBN in scalable, on-chip nanophotonic circuits and cavity quantum electrodynamics (QED) experiments requires robust techniques for the fabrication of high-quality optical resonators. In this letter, we design and engineer suspended photonic crystal cavities from hBN and demonstrate quality (Q) factors in excess of 2000. Subsequently, we show deterministic, iterative tuning of individual cavities by direct-write EBIE without significant degradation of the Q-factor. The demonstration of tunable cavities made from hBN is an unprecedented advance in nanophotonics based on van der Waals materials. Our results and hBN processing methods open up promising avenues for solid-state systems with applications in integrated quantum photonics, polaritonics and cavity QED experiments.

  • characterization and manipulation of individual defects in insulating Hexagonal Boron Nitride using scanning tunnelling microscopy
    Nature Nanotechnology, 2015
    Co-Authors: Dillon Wong, Kenji Watanabe, Takashi Taniguchi, Jairo Velasco, Juwon Lee, Salman Kahn, Hsinzon Tsai, A Zettl
    Abstract:

    The scanning tunnelling microscope can be used to image and manipulate individual defects in bulk insulating Hexagonal Boron Nitride by capping the material with a monolayer of graphene.

  • carbon nanotube quantum dots on Hexagonal Boron Nitride
    Applied Physics Letters, 2014
    Co-Authors: A Baumgartner, Kenji Watanabe, Takashi Taniguchi, Gulibusitan Abulizi, Jorg Gramich, Christian Schonenberger
    Abstract:

    We report the fabrication details and low-temperature characteristics of carbon nanotube (CNT) quantum dots on flakes of Hexagonal Boron Nitride (hBN) as substrate. We demonstrate that CNTs can be grown on hBN by standard chemical vapor deposition and that standard scanning electron microscopy imaging and lithography can be employed to fabricate nanoelectronic structures when using optimized parameters. This proof of concept paves the way to more complex devices on hBN, with more predictable and reproducible characteristics and electronic stability.

  • carbon nanotube quantum dots on Hexagonal Boron Nitride
    arXiv: Mesoscale and Nanoscale Physics, 2014
    Co-Authors: A Baumgartner, Kenji Watanabe, Takashi Taniguchi, Gulibusitan Abulizi, Jorg Gramich, C Schoenenberger
    Abstract:

    We report the fabrication details and low-temperature characteristics of the first carbon nanotube (CNT) quantum dots on flakes of Hexagonal Boron Nitride (hBN) as substrate. We demonstrate that CNTs can be grown on hBN by standard chemical vapor deposition and that standard scanning electron microscopy imaging and lithography can be employed to fabricate nanoelectronic structures when using optimized parameters. This proof of concept paves the way to more complex devices on hBN, with more predictable and reproducible characteristics and electronic stability.

Milos Toth - One of the best experts on this subject based on the ideXlab platform.

  • low temperature electron phonon interaction of quantum emitters in Hexagonal Boron Nitride
    ACS Photonics, 2020
    Co-Authors: Gabriele Grosso, Milos Toth, Igor Aharonovich, Hyowon Moon, Christopher J Ciccarino, Johannes Flick, Noah Mendelson, Lukas Mennel, Prineha Narang, Dirk Englund
    Abstract:

    Single photon sources based on atomic defects in layered Hexagonal Boron Nitride (hBN) have emerged as promising solid state quantum emitters with atom-like photophysical and quantum optoelectronic...

  • Hexagonal Boron Nitride Cavity Optomechanics
    2019
    Co-Authors: Prasoon K. Shandilya, Milos Toth, Igor Aharonovich, Johannes E. Fröch, Matthew Mitchell, David P. Lake, Sejeong Kim, Bishnupada Behera, Chris Healey, Paul E. Barclay
    Abstract:

    Hexagonal Boron Nitride (hBN) is an emerging layered material that plays a key role in a variety of two-dimensional devices, and has potential applications in nanophotonics and nanomechanics. Here, we demonstrate the first cavity optomechanical system incorporating hBN. Nanomechanical resonators consisting of hBN beams with average dimensions of 12 μm × 1.2 μm × 28 nm and minimum predicted thickness of 8 nm were fabricated using electron beam induced etching and positioned in the optical near-field of silicon microdisk cavities. Of the multiple devices studied here a maximum 0.16 pm/Hz sensitivity to the hBN nanobeam motion is demonstrated, allowing observation of thermally driven mechanical resonances with frequencies between 1 and 23 MHz, and largest mechanical quality factor of 1100 for a 23 MHz mode, at room temperature in high vacuum. In addition, the role of air damping is studied via pressure dependent measurements. Our results constitute an important step toward realizing integrated optomechanical circuits employing hBN

  • photonic crystal cavities from Hexagonal Boron Nitride
    Nature Communications, 2018
    Co-Authors: Sejeong Kim, Milos Toth, Je Fröch, Kenji Watanabe, Takashi Taniguchi, Joe Christian, Marcus Straw, James W Bishop, Daniel Totonjian, Igor Aharonovich
    Abstract:

    Development of scalable quantum photonic technologies requires on-chip integration of photonic components. Recently, Hexagonal Boron Nitride (hBN) has emerged as a promising platform, following reports of hyperbolic phonon-polaritons and optically stable, ultra-bright quantum emitters. However, exploitation of hBN in scalable, on-chip nanophotonic circuits and cavity quantum electrodynamics (QED) experiments requires robust techniques for the fabrication of high-quality optical resonators. In this letter, we design and engineer suspended photonic crystal cavities from hBN and demonstrate quality (Q) factors in excess of 2000. Subsequently, we show deterministic, iterative tuning of individual cavities by direct-write EBIE without significant degradation of the Q-factor. The demonstration of tunable cavities made from hBN is an unprecedented advance in nanophotonics based on van der Waals materials. Our results and hBN processing methods open up promising avenues for solid-state systems with applications in integrated quantum photonics, polaritonics and cavity QED experiments.

  • quantum emission from Hexagonal Boron Nitride monolayers
    Conference on Lasers and Electro-Optics, 2016
    Co-Authors: Toan Trong Tran, Michael J. Ford, Kerem Bray, Milos Toth, Igor Aharonovich
    Abstract:

    We demonstrate first room temperature, and ultrabright single photon emission from a color center in two-dimensional multilayer Hexagonal Boron Nitride. Density Functional Theory calculations indicate that vacancy-related centers are a likely source of the emission.

  • Quantum emission from Hexagonal Boron Nitride monolayers
    Nature Nanotechnology, 2016
    Co-Authors: Toan Trong Tran, Michael J. Ford, Kerem Bray, Milos Toth, Igor Aharonovich
    Abstract:

    Atomically thin van der Waals crystals have recently enabled new scientific and technological breakthroughs across a variety of disciplines in materials science, nanophotonics and physics. However, non-classical photon emission from these materials has not been achieved to date. Here we report room temperature quantum emission from Hexagonal Boron Nitride nanoflakes. The single photon emitter exhibits a combination of superb quantum optical properties at room temperature that include the highest brightness reported in the visible part of the spectrum, narrow line width, absolute photo-stability, a short excited state lifetime and a high quantum efficiency. Density functional theory modeling suggests that the emitter is the antisite nitrogen vacancy defect that is present in single and multi-layer Hexagonal Boron Nitride. Our results constitute the unprecedented potential of van der Waals crystals for nanophotonics, optoelectronics and quantum information processing.

Robert M Wallace - One of the best experts on this subject based on the ideXlab platform.

  • toward the controlled synthesis of Hexagonal Boron Nitride films
    ACS Nano, 2012
    Co-Authors: Ariel Ismach, Harry Chou, Domingo Ferrer, Stephen Mcdonnell, Herman C Floresca, Alan Covacevich, Cody W Pope, Richard D Piner, Moon J Kim, Robert M Wallace
    Abstract:

    Atomically smooth Hexagonal Boron Nitride (h-BN) layers have very useful properties and thus potential applications for protective coatings, deep ultraviolet (DUV) emitters, and as a dielectric for nanoelectronics devices. In this paper, we report on the growth of h-BN by a low-pressure chemical vapor deposition (LPCVD) process using diborane and ammonia as the gas precursors. The use of LPCVD allows synthesis of h-BN with a controlled number of layers defined by the growth conditions, temperature, time, and gas partial pressure. Furthermore, few-layer h-BN was also grown by a sequential growth method, and insights into the growth mechanism are described, thus forming the basis of future growth of h-BN by atomic layer epitaxy.