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Tamagnone, Michele

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Tamagnone

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Michele

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Tamagnone, Michele
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    Metasurface Optics for On-Demand Polarization Transformations Along the Optical Path
    (Springer Science and Business Media LLC, 2021-01-28) Dorrah, Ahmed H.; Rubin, Noah; Zaidi, Muhammad; Tamagnone, Michele; Capasso, Federico
    Polarization plays a key role in science; hence its versatile manipulation is crucial. Existing polarization optics, however, can only manipulate polarization in a single transverse plane. Here, we demonstrate a new class of polarizers and waveplates, based on metasurfaces, that can impart an arbitrarily chosen polarization response along the propagation direction, regardless of the incident polarization. The underlying mechanism relies on transforming an incident waveform into an ensemble of pencil-like beams with different polarization states that beat along the optical axis thereby changing the resulting polarization at-will, locally, as light propagates. Remarkably, using form birefringent metasurfaces combined with matrix-based holography enable the desired propagation-dependent polarization response to be enacted without a priori knowledge of the incident polarization—a behavior that would require three polarization sensitive holograms if implemented otherwise. Our work expands the use of polarization in the design of multi-functional metasurfaces and may find application in tunable structured light, optically switchable devices, and versatile light-matter interactions.
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    Ultra-confined mid-infrared resonant phonon polaritons in van der Waals nanostructures
    (American Association for the Advancement of Science, 2018) Tamagnone, Michele; Ambrosio, Antonio; Chaudhary, Kundan; Jauregui, Luis A.; Kim, Philip; Wilson, William; Capasso, Federico
    Hexagonal boron nitride has been proposed as an excellent candidate to achieve subwavelength infrared light manipulation owing to its polar lattice structure, enabling excitation of low-loss phonon polaritons with hyperbolic dispersion. We show that strongly subwavelength hexagonal boron nitride planar nanostructures can exhibit ultra-confined resonances and local field enhancement. We investigate strong light-matter interaction in these nanoscale structures via photo-induced force microscopy, scattering-type scanning near-field optical microscopy, and Fourier transform infrared spectroscopy, with excellent agreement with numerical simulations. We design optical nano-dipole antennas and directly image the fields when bright- or dark-mode resonances are excited. These modes are deep subwavelength, and strikingly, they can be supported by arbitrarily small structures. We believe that phonon polaritons in hexagonal boron nitride can play for infrared light a role similar to that of plasmons in noble metals at visible frequency, paving the way for a new class of efficient and highly miniaturized nanophotonic devices.