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    • 2018-05-23 09:20:11
    • Article ID: 694988

    Columbia Researchers Squeeze Light into Nanoscale Devices and Circuits

    Team is first to directly image propagation and dynamics of graphene plasmons at very low temperatures; findings could impact optical communications and signal processing

    • Credit: Dmitri Basov/Columbia University

      The best pictorial representation of a surface plasmon polariton is in terms of a “ripple” of electron density on the surface of graphene sample.

    Columbia Researchers Squeeze Light into Nanoscale Devices and Circuits 

    Team is first to directly image propagation and dynamics of graphene plasmons at very low temperatures; findings could impact optical communications and signal processing 

    New York, NY—May 23, 2018—As electronic devices and circuits shrink into the nanoscale, the ability to transfer data on a chip, at low power with little energy loss, is becoming a critical challenge. Over the past decade, squeezing light into tiny devices and circuits has been a major goal of nanophotonics researchers. Electronic oscillations at the surface of metals, known as surface plasmon polaritons or plasmons for short, have become an intense area of focus. Plasmons are hybrids of light (photons) and electrons in a metal. If researchers can harness this nanolight, they will be able to improve sensing, subwavelength waveguiding, and optical transmission of signals. 

    Columbia investigators have made a major breakthrough in this research, with their invention of a novel “home-built” cryogenic near-field optical microscope that has enabled them to directly image, for the first time, the propagation and dynamics of graphene plasmons at variable temperatures down to negative 250 degrees Celsius. The study was published online today in Nature

    “Our temperature-dependent study now gives us direct physical insight into the fundamental physics of plasmon propagation in graphene,” says Dimitri N. Basov, professor of physics at Columbia University, who led the study together with colleagues Cory Dean (physics) and James Hone (mechanical engineering, Columbia Engineering). “This insight was impossible to attain in previous nanoimaging studies done at room temperature. We were particularly surprised at discovering, after many years of failed attempts to get anywhere close, that compact nanolight can travel along the surface of graphene for distances of many tens of microns without unwanted scattering. The physics limiting the travel range of nanolight is a fundamental finding of our study and may lead to new applications in sensors, imaging, and signal processing.” 

    Basov, Dean, and Hone bring together years of experience in working with graphene, the one-atom-thick material that is one of the most promising candidates for novel photonic materials. Graphene’s optical properties are readily tunable and can be altered at ultrafast time scales. However, implementing nanolight without introducing unwanted dissipation in graphene has been very difficult to achieve.  

    The Columbia researchers developed a practical approach to confining light to the nanoscale. They knew they could form plasmon-polaritons, or resonant modes, in the graphene that propagate through the material as hybrid excitations of light and mobile electrons. These plasmon-polariton modes can confine the energy of electromagnetic radiation, or light, down to the nanoscale. The challenge was how to visualize these waves with ultra-high spatial resolution, so that they could study the performance of plasmonic modes at varying temperatures. 

    Alexander S. McLeod, a postdoctoral research scientist in the Basov Nano-optics Laboratory, built a unique microscope that enabled the team to explore the plasmon-polariton waves at high resolution while they cooled the graphene to cryogenic temperatures. Lowering the temperatures allowed them to “turn off” various scattering, or dissipation, mechanisms, one after another, as they cooled down their samples and learned which mechanisms were relevant. 

    “Now that our novel nanoimaging capabilities are deployed to low temperatures, we can see directly the unmitigated wave propagation of collective light-and-charge excitations within graphene,” says McLeod, co-lead author of the study with Guangxin Ni, also a postdoctoral research scientist in Basov’s lab. “Often times in physics, as in life, seeing truly is believing! The record-breaking travel range of these waves shows they’re destined to take on a life of their own, funneling signals and information back and forth inside next-generation optical devices.” 

    The study is the first to demonstrate the fundamental limitations for the propagation of plasmon polariton waves in graphene. The team found that graphene plasmons propagate ballistically, across tens of micrometers, throughout the tiny device. These plasmon modes are confined within a volume of space hundreds, if not thousands, of times smaller than that occupied by freely propagating light. 

    Plasmons in graphene can be tuned and controlled via an external electric field, which gives graphene a big advantage over conventional plasmonic media such as metal surfaces, which are inherently non-tunable. Moreover, the lifetimes of plasmon waves in graphene are now found to exceed those in metals by a factor of 10 to a 100, while propagating over comparably longer distances. These features offer enormous advantages for graphene as a plasmonic medium in next-generation opto-electronic circuits. 

    “Our results establish that graphene ranks among the best candidate materials for infrared plasmonics, with applications in imaging, sensing, and nano-scale manipulation of light,” says Hone. “Furthermore, our findings reveal the fundamental physics of processes that limit propagation of plasmon waves in graphene. This monumental insight will guide future efforts in nanostructure engineering, which may be able to remove the remaining roadblocks for long-range travel of versatile nanoconfined light within future optical devices.” 

    The current study is the beginning of a series of low-temperature investigations focused on controlling and manipulating confined plasmons in nanoscale optoelectronic graphene devices. The team is now using low-temperature nanoimaging to explore novel plasmonics effects such as electrically-induced plasmonic reflection and modulation, topological chiral plasmons, and also superconducting plasmonics in the very recently discovered “magic angle” system of twisted bilayer graphene.

    About the Study 

    The study is titled “Fundamental limits to graphene plasmonics.” 

    Authors are: G. X. Ni, A. S. McLeod, L. Xiong, and D. N. Basov (Physics, Columbia University, and Physics, University of California, San Diego-UCSD); Z. Sun (UCSD); L. Wang (Mechanical Engineering, Columbia); K. W. Post, B. Y. Jiang, and M. M. Fogler (UCSD); S. S. Sunku (Physics and Applied Physics and Applied Mathematics, Columbia); J. Hone (Mechanical Engineering, Columbia);C. R. Dean (Physics, Columbia); and M. M. Fogler (UCSD). 

    The study was funded by the U.S. Department of Energy’s Basic Energy Sciences program (DOE-BES DESC0018426, DOE-BES DESC001821); the Air Force Office of Scientific Research (AFOSR FA9550-15-1-0478); Office of Naval Research (ONR N00014-15-1-2671). D.N.B is supported by the Gordon and Betty Moore Foundation’s EPiQS Initiative through Grant GBMF4533. J.H. acknowledges support from ONR N00014-13- 1-0662.

    The authors declare no competing financial interests. 

    ### 

    LINKS:
    Paper: https://www.nature.com/articles/s41586-018-0136-9
    DOI: 10.1038/s41586-018-0136-9
    https://www.nature.com/
    Basov: http://physics.columbia.edu/people/profile/760
    Dean: http://physics.columbia.edu/people/profile/646
    Hone: http://me.columbia.edu/james-hone
    http://engineering.columbia.edu/

    ### 

    Columbia Engineering
    Columbia Engineering, based in New York City, is one of the top engineering schools in the U.S. and one of the oldest in the nation. Also known as The Fu Foundation School of Engineering and Applied Science, the School expands knowledge and advances technology through the pioneering research of its more than 200 faculty, while educating undergraduate and graduate students in a collaborative environment to become leaders informed by a firm foundation in engineering. The School’s faculty are at the center of the University’s cross-disciplinary research, contributing to the Data Science Institute, Earth Institute, Zuckerman Mind Brain Behavior Institute, Precision Medicine Initiative, and the Columbia Nano Initiative. Guided by its strategic vision, “Columbia Engineering for Humanity,” the School aims to translate ideas into innovations that foster a sustainable, healthy, secure, connected, and creative humanity.

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