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Theoretical Advancement Enables Unprecedented Wave Control

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JOEL WILLIAMS, ASSOCIATE EDITOR
[email protected]

ITHACA, N.Y., Aug. 20, 2021 — Cornell researchers have proposed a new way to modulate the absorptive and the refractive qualities of metamaterials in real time, and their findings open new opportunities to control, in time and space, the propagation and scattering of waves for applications in various areas of wave physics and engineering. The research was conducted by doctoral students Zeki Hayran and Aobo Chen, along with their adviser Francesco Monticone, assistant professor in the school of electrical and computer engineering in the college of engineering. “In electromagnetics and photonics, materials...Read full article

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    Published: August 2021
    Glossary
    absorption
    Absorption is the process by which a material takes in energy from electromagnetic radiation (such as light, heat, or sound) and converts it to other forms of energy, typically internal energy (such as heat). This process occurs when the energy of the incident radiation is transferred to the atoms or molecules of the absorbing material, causing them to increase in vibrational, rotational, or electronic energy levels. In different contexts, absorption can refer to: Physics and optics:...
    wave
    1. An undulation or vibration; a form of movement by which all radiant energy of the electromagnetic spectrum is estimated to travel. 2. A type of surface defect, usually due to improper polishing.
    modulation
    In general, changes in one oscillation signal caused by another, such as amplitude or frequency modulation in radio which can be done mechanically or intrinsically with another signal. In optics the term generally is used as a synonym for contrast, particularly when applied to a series of parallel lines and spaces imaged by a lens, and is quantified by the equation: Modulation = (Imax – Imin)/ (Imax + Imin) where Imax and Imin are the maximum and minimum intensity levels of the image.
    bandwidth
    The range of frequencies over which a particular instrument is designed to function within specified limits. See also fiber bandwidth.
    scattering
    Change of the spatial distribution of a beam of radiation when it interacts with a surface or a heterogeneous medium, in which process there is no change of wavelength of the radiation.
    Research & TechnologyMaterialsOpticsabsorptionmetamaterialswaveswavewave dynamicscontroltheoreticaltheorymodulationmodulatedFrancesco MonticoneCornell UniversitytemporalspatialAmericasbandwidthscatteringoptica

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